{"id":1532,"date":"2012-05-01T15:07:46","date_gmt":"2012-05-01T15:07:46","guid":{"rendered":"http:\/\/phosdev.com\/todaysveterinarypractice\/?p=1532"},"modified":"2022-02-18T17:39:41","modified_gmt":"2022-02-18T17:39:41","slug":"todays-technician-venipuncture-in-exotic-companion-mammals","status":"publish","type":"post","link":"https:\/\/navc.sitepreview.app\/todaysveterinarypractice.com\/exotic-medicine\/todays-technician-venipuncture-in-exotic-companion-mammals\/","title":{"rendered":"Venipuncture in Exotic Companion Mammals"},"content":{"rendered":"<p><a href=\"https:\/\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2016\/06\/T1205C06.pdf\"><img decoding=\"async\" class=\"alignnone size-full wp-image-9886\" src=\"https:\/\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2011\/07\/pdf_button.png\" alt=\"pdf_button\" width=\"110\" height=\"27\" \/><\/a><\/p>\n<hr \/>\n<p><em>Amanda M. Maddamma, RVT, and Angela M. Lennox, DVM, Diplomate ABVP (Avian)<\/em><\/p>\n<p>Blood collection for diagnostic testing can be a challenge in exotic companion mammals, especially in smaller species. However, today&#8217;s technological advancements allow us to gain valuable information even with limited sample volume. In all cases, sample quality and minimal volume requirements must be taken into consideration.<\/p>\n<h2><span class=\"purple\">LABORATORY ANALYSIS<\/span><\/h2>\n<h3><strong> <span class=\"GreenAqua\">The Reference Laboratory<\/span><\/strong><\/h3>\n<p>Talk to your reference laboratory of choice to determine:<\/p>\n<ul>\n<li>Type of sample required for the desired test (whole blood versus plasma\/serum)<\/li>\n<li>Minimum required volume.<\/li>\n<\/ul>\n<p>In addition, preparation and sample storage are key to obtaining accurate results:<\/p>\n<ul>\n<li><strong>Serum<\/strong>\u00a0(separated from clotted blood) and\u00a0<strong>plasma<\/strong>\u00a0(separated from unclotted blood) samples may need to be kept frozen until ready for submission.<\/li>\n<li><strong>Anticoagulated whole blood<\/strong>\u00a0should be mixed with the proper type and volume of anticoagulant indicated for the test being run.<\/li>\n<li><strong>Whole blood samples<\/strong>\u00a0not sent out immediately should be refrigerated.<\/li>\n<li><strong>Blood smears<\/strong>\u00a0should be prepared immediately after the sample has been collected to minimize cell deterioration.<\/li>\n<\/ul>\n<p>The anticoagulant of choice for a complete blood count (CBC) is ethylenediamine tetra-acetic acid (EDTA) because it best preserves the cellular components of blood and prevents platelet aggregation.<\/p>\n<div class=\"orange-box\">\n<h2><span class=\"bluboldheader\">FACTS AT YOUR FINGERTIPS<\/span><\/h2>\n<ul>\n<li><strong>Circulating blood volume; loss, 15% to 20%:<\/strong>\u00a0Reduces cardiac output and blood pressure<\/li>\n<li><strong>Circulating blood volume; loss, 30% to 40%:<\/strong>\u00a0Induces life threatening shock<\/li>\n<li><strong>Plasma:<\/strong>\u00a0Separated from unclotted blood<\/li>\n<li><strong>Serum:<\/strong>\u00a0Separated from clotted blood<\/li>\n<li><strong>Total Blood Volume:<\/strong>\u00a0In mammalian species, approximately 6% to 8% of body weight<\/li>\n<li><strong>Maximum Volume of Blood to Collect:<\/strong>\u00a010% of total blood volume<\/li>\n<\/ul>\n<\/div>\n<h3><span class=\"GreenAqua\">In-house Analysis<\/span><\/h3>\n<p><span class=\"GreenAqua\">Samples can also be run in-house, utilizing equipment, such as blood chemistry analyzers and microscopes. Our preference is the Vetscan analyzer (abaxis.com), which has the ability to produce and process a chemistry panel with only 0.15 mL of whole blood, serum, or plasma. This feature is extremely beneficial when taking samples from very small patients.<\/span><\/p>\n<p><span class=\"GreenAqua\">A single drop of blood collected in a heparinized hematocrit tube is enough to process a modified in-house CBC, which includes:<\/span><\/p>\n<ul>\n<li>Hematocrit<\/li>\n<li>Total serum solids<\/li>\n<li>Differential and estimated white blood cell (WBC) count<\/li>\n<li>Analysis of both red blood cell (RBC) and WBC morphology and characteristics.<\/li>\n<\/ul>\n<h2><span class=\"purple\">BLOOD: TOTAL &amp; COLLECTION VOLUMES<\/span><\/h2>\n<h3><strong> <span class=\"GreenAqua\">Determining Volumes<\/span><\/strong><\/h3>\n<p>The volume of blood that can be safely removed from a patient without causing hypovolemia or other physiological stress depends on circulating blood volume.<\/p>\n<ul>\n<li>Carefully weigh each patient and calculate total blood volume: Total blood volume can vary among mammalian species, but in general is approximately 6% to 8% of the body weight.<\/li>\n<li>The volume of blood that can then be collected is 10% of the total blood volume.<\/li>\n<li>Therefore, a 100-gm patient has a blood volume of 6 to 8 mL and a maximum collection volume of 0.8 mL.<\/li>\n<li>Adjustments should be made for clinical condition; for example, collect smaller samples in patients that are hypovolemic or anemic.<\/li>\n<li>Regardless of the maximum amount available for collection, collect only what is required for testing.<\/li>\n<\/ul>\n<p>In many mammals, restoration of circulating fluid volume after sample collection usually occurs within 24 hours; however, complete return to normal hematocrit and RBC volume may take 1 to 4 weeks, depending on the volume collected (<strong>Table 1<\/strong>).<sup>1<\/sup><\/p>\n<p><a href=\"https:\/\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/050612-tt-table-1.jpg\"><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-9810\" src=\"https:\/\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/050612-tt-table-1.jpg\" alt=\"050612 tt table 1\" width=\"371\" height=\"189\" srcset=\"https:\/\/navc.sitepreview.app\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/050612-tt-table-1.jpg 371w, https:\/\/navc.sitepreview.app\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/050612-tt-table-1-300x153.jpg 300w\" sizes=\"(max-width: 371px) 100vw, 371px\" \/><\/a><\/p>\n<h3><strong><span class=\"GreenAqua\">Potential Risks<\/span><\/strong><\/h3>\n<p>If too much blood is drawn too quickly without replacement, hypovolemic shock may develop. In many mammal species:<\/p>\n<ul>\n<li>Loss of 15% to 20% of circulating blood volume will reduce cardiac output and blood pressure.<\/li>\n<li>Loss of 30% to 40% of circulating blood volume will induce life threatening shock.<\/li>\n<\/ul>\n<h2><span class=\"purple\">PRIOR TO COLLECTION<\/span><\/h2>\n<h3><strong> <span class=\"GreenAqua\">Sedation, Anesthesia, &amp; Analgesia<\/span><\/strong><\/h3>\n<p>In small patients, safe and effective restraint for venipuncture is potentially dangerous due to patient movement and becomes increasingly difficult as patient size decreases. For these reasons, sedation or anesthesia may be the key to success.<\/p>\n<p><strong>Sedation &amp; Anesthesia<\/strong>. In most cases, sedation is adequate and avoids the increased risk of general anesthesia.<\/p>\n<ul>\n<li>Keep in mind that inhalant anesthetics can produce artifacts in the CBCs of some species, such as lowering temporarily, but significantly, the hematocrit of a ferret.<\/li>\n<li>Various sedation protocols and methods can be considered depending on a number of factors, including overall patient condition.<\/li>\n<li>Ideally, a patient should be fasted for several hours before collecting blood if anesthesia is used. Even in patients that do not vomit, a temporary fast reduces the amount of food in the oral cavity, which could lead to aspiration during anesthesia.<\/li>\n<\/ul>\n<p><strong>Analgesia<\/strong>. The use of topical analgesia increases comfort and reduces patient movement at the moment of venipuncture.<\/p>\n<ul>\n<li>Safe dosages of lidocaine have not been determined in all species, but we have found 1 to 2 mg\/kg to be safe and effective.<\/li>\n<li>Lidocaine can be used as a gel or injected by:\n<ul>\n<li>Rolling the skin away from the puncture site<\/li>\n<li>Injecting the lidocaine<\/li>\n<li>Allowing the skin to roll back into normal position.<\/li>\n<\/ul>\n<\/li>\n<li>Wait 2 to 3 minutes before proceeding with venipuncture.<\/li>\n<\/ul>\n<h3><strong><span class=\"GreenAqua\">Choosing a Collection Site<\/span><\/strong><\/h3>\n<p>The sample site chosen is based on experience and preference. Limiting factors include the size of the patient and ability to properly restrain. The correct site is the one that produces a high-quality sample without patient injury (<strong>Table 2<\/strong>).<\/p>\n<p><a href=\"https:\/\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/050612-tt-table-2.gif\"><img decoding=\"async\" class=\"alignnone size-full wp-image-9811\" src=\"https:\/\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/050612-tt-table-2.gif\" alt=\"050612 tt table 2\" width=\"530\" height=\"620\" \/><\/a><\/p>\n<p><strong>Ferrets<\/strong>. Most ferrets can be safely restrained manually for blood collection by scruffing and stretching. An alternative is rolling the patient in a towel with the head and neck exposed.<\/p>\n<ul>\n<li>In our opinion, the ideal site for collection is the cranial vena cava, which is particularly safe in the ferret due to the distance between the manubrium and the heart. Follow the steps outlined in\u00a0<strong>Notes on Collection from the Cranial Vena Cava<\/strong>, using a 25-gauge needle and a 1- to 3-mL syringe.<\/li>\n<li>Other collection sites include the jugular vein and ventral tail vein, which is accessed using a 25-gauge needle and 1-mL syringe directed dorsally from the underside of the tail until bone is contacted. The needle is then retracted slightly and redirected until a flash of blood is obtained.<\/li>\n<\/ul>\n<p><strong>Rabbits<\/strong>. Restraint of rabbits is more difficult, as rabbits kick powerfully, which can result in luxation or subluxation of the vertebrae. Many handlers prefer a secure burrito-style towel wrap for restraint.<\/p>\n<ul>\n<li>Suggested collection sites are the central or marginal auricular vessels. For the purpose of blood collection, any large visible auricular vessel can be safely punctured for blood collection (<strong>Figure 1<\/strong>).<\/li>\n<\/ul>\n<div id=\"attachment_2571\" style=\"width: 169px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/NEW-Figure-1A.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-2571\" class=\"wp-image-2571 size-medium\" src=\"https:\/\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/NEW-Figure-1A-159x300.jpg\" alt=\"NEW Figure 1A\" width=\"159\" height=\"300\" \/><\/a><p id=\"caption-attachment-2571\" class=\"wp-caption-text\">Figure 1A. Auricular vessels of the rabbit; any accessible vessel can be used for venipuncture.<\/p><\/div>\n<div id=\"attachment_2572\" style=\"width: 310px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/NEW-Figure-1B.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-2572\" class=\"wp-image-2572 size-medium\" src=\"https:\/\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/NEW-Figure-1B-300x264.jpg\" alt=\"NEW Figure 1B\" width=\"300\" height=\"264\" srcset=\"https:\/\/navc.sitepreview.app\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/NEW-Figure-1B-300x264.jpg 300w, https:\/\/navc.sitepreview.app\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/NEW-Figure-1B.jpg 341w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-2572\" class=\"wp-caption-text\">Figure 1B. Collection of blood from the central auricular vessel in a rabbit using a 25-gauge needle and 1-mL syringe.<\/p><\/div>\n<ul>\n<li>Other collection sites include the lateral saphenous vein located along the lateral aspect of the leg above the hock (<strong>Figure 2<\/strong>) and cephalic veins.<\/li>\n<li>A 25- to 27-gauge needle with 1-mL syringe is recommended.<\/li>\n<\/ul>\n<div id=\"attachment_2573\" style=\"width: 310px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/NEW-Figure-2A.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-2573\" class=\"wp-image-2573 size-medium\" src=\"https:\/\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/NEW-Figure-2A-300x209.jpg\" alt=\"NEW Figure 2A\" width=\"300\" height=\"209\" srcset=\"https:\/\/navc.sitepreview.app\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/NEW-Figure-2A-300x209.jpg 300w, https:\/\/navc.sitepreview.app\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/NEW-Figure-2A.jpg 431w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-2573\" class=\"wp-caption-text\">Figure 2A. Venipuncture in a rabbit using the lateral saphenous vein. The vein is located laterally above the hock.<\/p><\/div>\n<div id=\"attachment_2574\" style=\"width: 310px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/NEW-Figure-2B.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-2574\" class=\"wp-image-2574 size-medium\" src=\"https:\/\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/NEW-Figure-2B-300x273.jpg\" alt=\"NEW Figure 2B\" width=\"300\" height=\"273\" srcset=\"https:\/\/navc.sitepreview.app\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/NEW-Figure-2B-300x273.jpg 300w, https:\/\/navc.sitepreview.app\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/NEW-Figure-2B.jpg 330w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-2574\" class=\"wp-caption-text\">Figure 2B. The vessel is accessed using a 25-gauge needle and 1-mL syringe.<\/p><\/div>\n<p><strong>Guinea Pigs &amp; Other Rodents<\/strong>. Guinea pigs and some larger rodents can simply be grasped around the thorax and shoulders for venipuncture restraint. Restraining smaller species is more difficult. For these patients, sedation can be extremely effective.<\/p>\n<ul>\n<li>Suggested collection sites include the cranial vena cava and lateral saphenous vein, following the steps outlined in\u00a0<strong>Notes on Collection from the Cranial Vena Cava<\/strong>. We prefer the cranial vena cava in most rodents but the lateral saphenous in the guinea pig.<\/li>\n<li>Other collection sites include the lateral tail vein for smaller rodents (rats) and, for larger rodents, the tarsal vein, which is often visualized along the dorsal aspect of the rear foot.<\/li>\n<li>Laboratory collection techniques for rodents, including accessing the orbital sinus, are not recommended in pets.<\/li>\n<\/ul>\n<p><strong>Sugar Gliders &amp; Hedgehogs<\/strong>. Some exotic pets, such as sugar gliders and hedgehogs, are challenging to restrain; sedation or anesthesia is required. It is also difficult to find an adequate venipuncture site.<\/p>\n<ul>\n<li>In both species, the cranial vena cava (<strong>Figure 3<\/strong>) is associated with a higher success rate for venipuncture.<\/li>\n<li>The ventral tail vein is sometimes useful in the sugar glider.<\/li>\n<\/ul>\n<div id=\"attachment_2575\" style=\"width: 310px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/NEW-Figure-3.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-2575\" class=\"wp-image-2575 size-medium\" src=\"https:\/\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/NEW-Figure-3-300x169.jpg\" alt=\"NEW Figure 3\" width=\"300\" height=\"169\" srcset=\"https:\/\/navc.sitepreview.app\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/NEW-Figure-3-300x169.jpg 300w, https:\/\/navc.sitepreview.app\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/NEW-Figure-3.jpg 531w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-2575\" class=\"wp-caption-text\">Figure 3. Venipuncture in a hedgehog sedated with midazolam and butorphanol, using the cranial vena cava technique. The needle is inserted at either side of the manubrium of the sternum; then the needle and syringe are advanced (while applying gentle negative pressure) toward the opposite hip until a flash of blood is detected. Note the intraosseous catheter placed in the patient\u2019s tibia.<\/p><\/div>\n<p><strong>Pot-bellied Pigs<\/strong>. Pot-bellied pigs are difficult to restrain (vocalizing loudly and struggling) and have subcutaneous fat that complicates venipuncture. We prefer sedation and collection from the auricular vessels or the cranial vena cava (<strong>Figure 4<\/strong>)<\/p>\n<div id=\"attachment_2576\" style=\"width: 310px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/NEW-Figure-4A.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-2576\" class=\"wp-image-2576 size-medium\" src=\"https:\/\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/NEW-Figure-4A-300x214.jpg\" alt=\"NEW Figure 4A\" width=\"300\" height=\"214\" srcset=\"https:\/\/navc.sitepreview.app\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/NEW-Figure-4A-300x214.jpg 300w, https:\/\/navc.sitepreview.app\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/NEW-Figure-4A.jpg 421w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-2576\" class=\"wp-caption-text\">Figure 4A. Venipuncture in a pot-bellied pig: Except in debilitated patients, sedation or anesthesia is usually required. The auricular vessels can be seen on the dorsal aspect of the pinna.<\/p><\/div>\n<div id=\"attachment_2577\" style=\"width: 310px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/NEW-Figure-4B.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-2577\" class=\"wp-image-2577 size-medium\" src=\"https:\/\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/NEW-Figure-4B-300x298.jpg\" alt=\"NEW Figure 4B\" width=\"300\" height=\"298\" srcset=\"https:\/\/navc.sitepreview.app\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/NEW-Figure-4B-300x298.jpg 300w, https:\/\/navc.sitepreview.app\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/NEW-Figure-4B-150x150.jpg 150w, https:\/\/navc.sitepreview.app\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/NEW-Figure-4B.jpg 302w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-2577\" class=\"wp-caption-text\">Figure 4B. The cranial vena cava is located directly under the manubrium of the sternum.<\/p><\/div>\n<div class=\"orange-box\">\n<h2>NOTES ON COLLECTION FROM THE CRANIAL VENA CAVA<\/h2>\n<p>The cranial vena cava is the largest accessible blood vessel in mammals; therefore, it is often extremely useful in small exotic companion animal patients.<\/p>\n<ul>\n<li>The\u00a0<strong>access point<\/strong>\u00a0is under the manubrium of the sternum.<\/li>\n<li>Depending on the species, the\u00a0<strong>puncture site<\/strong>\u00a0can be located just rostral to major cardiac vessels (small rodents) or separated from these vessels by a distance of 3 to 4 cm (ferrets).<\/li>\n<li>The patient must be\u00a0<strong>kept absolutely still<\/strong>\u00a0due to risk of significant bleeding if a vessel is lacerated. Some patients, like the ferret, can be manually restrained, but most require sedation or anesthesia. Extremely debilitated patients may not require sedation.<\/li>\n<li>The\u00a0<strong>syringe and needle<\/strong>\u00a0are inserted to the right, left, or just under the manubrium of the sternum; then directed toward the opposite hip.<\/li>\n<li><strong>Negative pressure<\/strong>\u00a0is applied until a flash of blood is obtained.<\/li>\n<\/ul>\n<\/div>\n<h2><span class=\"purple\">PROPER COLLECTION TECHNIQUE<\/span><\/h2>\n<p>Improper collection techniques can produce poor-quality samples and cause patient harm. Proper precautionary measures should be taken to achieve the ideal sample.<\/p>\n<ul>\n<li><strong>Choose the correct size of needle and syringe<\/strong>\u00a0based on patient size and vessel being used. The ideal needle size is the largest that can be safely used in the patient. Very small needles or small needles used with larger syringes\/excessive negative pressure will produce hemolysis.<\/li>\n<li><strong>Choose needles with clear hubs<\/strong>\u00a0to ideally detect the flash of blood when the vessel is punctured.<\/li>\n<li><strong>Preheparinize all needles and syringes<\/strong>\u00a0by pulling up a small amount of heparin and expelling it. We prefer this practice because it helps prevent micro clots in the needle and improves sample quality. Biochemistry values are not significantly impacted.<\/li>\n<li><strong>Properly restrain the patient<\/strong>, either manually or ideally with sedation, if necessary.<\/li>\n<li><strong>Prepare the site<\/strong>\u00a0by clipping or cleaning with isopropyl alcohol.<\/li>\n<li><strong>Hold off the vessel<\/strong>\u00a0being utilized, if applicable.<\/li>\n<li><strong>Insert the needle<\/strong>, bevel up, directly over the vessel. If you have entered the vessel correctly, you will see a small flash of blood in the hub of the needle.<\/li>\n<li><strong>Use minimal negative pressure<\/strong>\u00a0to acquire the proper sample volume needed.<\/li>\n<li><strong>Discontinue holding off the vessel<\/strong>\u00a0before removing the needle.<\/li>\n<li><strong>Consider entering the vessel with the needle only<\/strong>\u00a0in very small patients and collecting blood from the hub into heparinized hematocrit tubes.<\/li>\n<li><strong>Apply direct pressure<\/strong>\u00a0to the puncture site for 30 seconds after the needle has been removed.<\/li>\n<li><strong>Remove the top from the tube<\/strong>\u00a0selected for use.<\/li>\n<li><strong>Remove the needle from the syringe<\/strong>\u00a0and slowly dispense the sample into the collection tube, holding the tube at an angle and letting the sample roll down the side of the tube. Pushing the sample back through the needle or with excessive force will produce hemolysis.<\/li>\n<\/ul>\n<h2><span class=\"purple\">COMPLICATIONS<\/span><\/h2>\n<p>As with any procedure, there are always associated risks that may lead to injury or death of the patient. Inexpert venipuncture can result in hematoma formation, infection and\/or inflammation at the site, and potentially permanent destruction of the vessel. However, following the tips and suggestions presented in this article will help prevent negative consequences from taking place during venipuncture in your companion animal patients.<\/p>\n<p>CBC = complete blood count; EDTA = ethylenediamine tetra-acetic acid; RBC = red blood cell; WBC = white blood cell<\/p>\n<h3><strong>Reference<\/strong><\/h3>\n<ol>\n<li>Iowa State University Institutional Animal Care and Use Committee (blood collection guidelines): compliance.iastate.edu\/iacuc\/policies\/docs\/blood-collection-guidelines.pdf.<\/li>\n<\/ol>\n<h3><strong>Suggested Reading<\/strong><\/h3>\n<ul>\n<li>Bihun C, Bauck L. Basic anatomy, physiology and clinical techniques. In Carpenter JW, Quesenberry KE (eds):\u00a0<em>Ferrets, Rabbits and Rodents Clinical Medicine and Surgery<\/em>, 2nd ed. St. Louis: Saunders, 2005, pp 286-298.<\/li>\n<li class=\"references\">Capello V. Application of the cranial vena cava venipuncture technique to small exotic mammals.\u00a0<em>Exotic DVM<\/em>\u00a02006; 8(3):51-55.<\/li>\n<li class=\"references\">Joslin JO. Blood collection in small mammals.\u00a0<em>J Exotic Pet Med<\/em>\u00a02009; 18(2):117-139.<\/li>\n<li class=\"references\">Mader DR. Rabbits: Basic approach to veterinary care. In Carpenter JW, Quesenberry KE (eds):\u00a0<em>Ferrets, Rabbits and Rodents Clinical Medicine and Surgery<\/em>, 2nd ed. St. Louis: Saunders, 2005, pp 147-154.<\/li>\n<li class=\"references\">Marini RP, Jackson LR, Esteves MI, et al. Effect of isoflurane on hematological variables in ferrets.\u00a0<em>Am J Vet Res<\/em>\u00a01994; 55:1479-1483.<\/li>\n<\/ul>\n<p class=\"references\"><span class=\"author-bio\"><strong><a href=\"https:\/\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/Mandy-M.-Maddamma.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-9812\" src=\"https:\/\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/Mandy-M.-Maddamma.jpg\" alt=\"Mandy M. Maddamma\" width=\"100\" height=\"116\" \/><\/a>Mandy M. Maddamma<\/strong>, RVT, a registered veterinary technician, has special clinical interests in exotic pet sedation, anesthesia, and surgical care. She received her degree from the International Business College Veterinary Technician Institute. Ms. Maddamma is the owner of numerous exotic pets, including birds, rabbits and rodents.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p class=\"references\"><span class=\"author-bio\"><strong><a href=\"https:\/\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/Angela-M.-Lennox.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-9813\" src=\"https:\/\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2012\/05\/Angela-M.-Lennox.jpg\" alt=\"Angela M. Lennox\" width=\"100\" height=\"116\" \/><\/a>Angela M. Lennox<\/strong>, DVM, Diplomate ABVP (Avian), is the owner of The Avian and Exotic Animal Clinic in Indianapolis, Indiana, where she has practiced exclusive exotic animal medicine for more than 20 years. She is currently Indiana&#8217;s only board-certified specialist in avian medicine. In addition, Dr. Lennox is an adjunct professor at Purdue University, teaching a variety of exotic animal medicine and surgery topics to both veterinary and veterinary technician students. She has written and edited many books and articles on topics in exotic medicine, including the <em>Rabbit and Rodent Dentistry Handbook<\/em> and <em>Clinical Radiology of Exotic Companion Mammals<\/em>.\u2028 Dr. Lennox has also served as president of the Association of Exotic Mammal Veterinarians (AEMV, aemv.org), a group dedicated to improving the standards of exotic mammal medicine. She received her DVM from Purdue University.<\/span><\/p>\n<p class=\"references\"><strong class=\"references\"><strong class=\"references\"><br \/>\n<\/strong><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Amanda M.<\/p>\n","protected":false},"author":1,"featured_media":2518,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"iawp_total_views":3997,"footnotes":""},"categories":[380],"tags":[13],"class_list":["post-1532","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-may-june-2012","tag-peer-reviewed","clinical_topics-exotic-medicine"],"acf":{"hide_sidebar":false,"hide_sidebar_ad":false,"hide_all_ads":false},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.7 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Venipuncture in Exotic Companion Mammals | Today&#039;s Veterinary 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