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Guidelines
Suggested parameters and sets of instructions outlining best practices and standards for accomplishing specific animal care and use research duties.

Guidelines on Blood Collection

Unit for Laboratory Animal Medicine

| Approval Date:

April 23, 2021 12:00 am

This document is designed to provide general information on blood collection methods for common laboratory animals. All procedures must be approved by the Institutional Animal Care and Use Committee (IACUC). The method of blood collection to be used, the intervals between blood collection procedures, and the volume of blood to be removed, must be listed in the approved protocol specific to each study.

The ULAM veterinary staff provides the following criteria to determine the maximum safe amount of blood to be withdrawn. It is recommended to take no more blood than is absolutely necessary. Remember to calculate beforehand the minimum amount of blood necessary to perform all tests and assays, and that the serum fraction is about ½ of the total blood volume. When calculating blood volumes based on body weights, remember that body weights in kilograms (kgs) will convert to blood volumes in liters, and weights in grams will convert to volumes in milliliters (mls).

Procedures

1. Approximate Blood Volume

  1. 5-10% of body weight = total blood volume
    1. In healthy animals the circulating blood volume can generally be estimated as 55-70 ml/kg of the total body weight.
    2. In sick, obese and older animals the circulating blood volume can be up to 15% lower than in healthy animals, therefore, calculations should be adjusted accordingly.
    3. See Table 13 at end of this document for average blood volumes in certain species.

2. Blood Collection Volumes

  1. 1% of body weight (BW) = maximum volume that can be collected every 14 days, without requiring supplemental fluids. Examples:
    1. 0.15 ml from a 15 g mouse
    2. 3 ml from a 300 g rat
    3. 50 ml from a 5 kg cat
    4. 100 ml from a 10 kg monkey
    5. 400 ml from a 40 kg dog
  2. If blood collections are needed multiple times within a 14-day period, calculate the total amount needed over the 14-day span and divide 1% by that number. Examples:
    1. 0.07% of body weight maximum per collection if 14 samples are needed within a 14-day period.
    2. 0.1% of body weight maximum per collection if 10 samples are needed within a 14-day period.
    3. 0.14% of body weight maximum per collection if 7 samples are needed within a 14-day period.
    4. 4-5% of body weight = amount expected at exsanguinations (see Section 4)

3. Fluid Replacement Recommendations

  1. If the total volume withdrawn over a 14-day period is greater than 1% BW, fluid volume replacement must be considered.
  2. Use of a warm (30-35ºC) isotonic solution (e.g., 0.9% saline, lactated Ringer’s solution) constitutes accepted veterinary practice. Replacement fluids should be infused at a slow and steady rate.
  3. Examples of Fluid Replacement
    1. For a 15 g mouse:
      1. Up to 0.15 ml (1% withdrawn) of blood collected over 14 days does not require fluid replacement.
      2. Up to 0.3 ml (2% withdrawn) of blood collected over 14 days, requires fluid replacement with 0.3 ml appropriate fluids SQ.
    2. For a 300 g rat:
      1. Up to 3 ml (1% withdrawn) of blood collected over 14 days does not require fluid replacement.
      2. Up to 6 ml (2% withdrawn) of blood collected over 14 days, requires fluid replacement with 0.3 ml appropriate fluids SQ.
    3. For a 20 kg dog:
      1. Up to 200 ml (1% withdrawn) of blood collected over 14 days does not require fluid replacement.
      2. Up to 400 ml (2% withdrawn) of blood collected over 14 days, requires fluid replacement with 0.3 ml appropriate fluids SQ or IV.

4. Exsanguination

  1. Approximately 50-75% of total blood volume (4-5% of body weight) can be obtained by terminal exsanguination. The animal must be deeply anesthetized, or recently euthanized, prior to exsanguination. Since the amount of blood obtained is substantially increased if the heart is beating during the bleeding procedure, use of a surgical plane of anesthesia is recommended. The procedure for anesthesia and/or euthanasia must be described fully in the approved IACUC protocol. Examples:
    1. 0.60-0.75 ml from a 15 g mouse
    2. 12-15 ml from a 300 g rat
    3. 200-250 ml from a 5 kg cat
    4. 400-500 ml from a 10 kg monkey
    5. 1600-2000 ml from a 40 kg dog

5. Monitoring

  1. If too much blood is withdrawn too rapidly or too frequently without replacement (approximately 2% of the animal’s body weight at one time), the animal may go into hypovolemic shock. If signs of shock are observed, contact the ULAM veterinary staff immediately. Signs of shock include:
    1. Fast and thready pulse
    2. Pale dry mucous membranes
    3. Cold skin and extremities
    4. Restlessness
    5. Hyperventilation
    6. Sub-normal body temperature
  2. If 15-20% of total blood volume is removed, cardiac output and blood pressure will be reduced.
  3. If 30-40% of total blood volume is removed, death will result in at least 50% of animals.
  4. If > 40% of total blood volume is removed, death of the animal is expected.
  5. Stressed, sick, or otherwise compromised animals may not tolerate the blood collection criteria noted above, which is for healthy animals.
  6. By monitoring hematocrit (Hct or PCV) and/or hemoglobin (Hb) it is possible to evaluate if the animal has sufficiently recovered from single or multiple blood draws. Remember it may take up to 24 hours for hematocrit or hemoglobin to reflect a sudden or acute blood loss. In general, if the animal is anemic (below the normal PCV range for the species), or if the hemoglobin concentration is less than 10 gm/dL, it is not safe to remove the volumes of blood listed above.

6. Blood Collection Sites & Methods

The tables below list the most frequently used blood collection sites for common laboratory animal species. They are listed from most common/desirable to least common/desirable based on ease of collection from the site. For uncommon laboratory animal species, please contact the ULAM veterinarians at [email protected]. For smaller species, the volume of blood attainable for each site is listed based; however, this is an estimation and will also depend on the size, heath, and hydration status of the animal as well as the experience level of the person collecting the sample. Based on the goals and requirements of the study, certain sites may be preferable). Additionally, publications have indicated that the results from blood analysis (especially cellular indices) may vary based on the site of blood withdrawal; consult the literature for more information. In all cases, cardiac puncture may be used to obtain a single, large volume of blood from heavily anesthetized (terminal procedure only) or euthanized animals.

  1. Table 1: Mouse

    Site Anesthesia Repeat Bleeds Expected Volume
    Lateral Tail Vein No Yes 50 – 100 ul
    Saphenous Vein No Yes 100 – 200 ul
    Facial Vein (submandibular & submental veins) No Yes 200 – 500 ul
    Distal Tail Transection (less than 3mm) Requireda Yes – limited < 100 ul
    Retro-Orbital Sinus Required Yes – limited 200 ul
    Sublingual Vein Required Yes 500 ul
    Jugular Vein Recommended Yes
    Cardiac Puncture (Terminal Only) Required Terminal ~ 1 ml

    aDistal tail transection in gerbils, and adult rats and mice (>21 days) requires the use of general anesthesia and preemptive analgesia (e.g., NSAIDs, opioids) unless scientifically justified and approved in the IACUC protocol.

  2. Table 2: Rat

    Site Anesthesia Repeat Bleeds Expected Volume
    Saphenous Vein No Yes 300 – 400 ul
    Lateral Tail Vein No Yes 200 – 400 ul
    Distal Tail Transection (less than 3mm) Requireda Yes 200 – 400 ul
    Dorsal Metatarsal No Yes 100 – 200 ul
    Submandibular / Facial Vein No Yes 200 – 500 ul
    Jugular Vein Required Yes 0.5 – 2.0 ml
    Sublingual Vein Required Yes 0.5 – 1.0 ml
    Retro-Orbital Plexus Required Yes – limited 0.5 – 1.0 ml
    Cardiac Puncture (Terminal Only) Required Terminal ~3 ml

    aDistal tail transection in gerbils, and adult rats and mice (>21 days) requires the use of general anesthesia and preemptive analgesia (e.g., NSAIDs, opioids) unless scientifically justified and approved in the IACUC protocol.

  3. Table 3: Hamster

    Site Anesthesia Repeat Bleeds Expected Volume
    Lateral Tarsal Vein No Yes 100 – 200 ul
    Toenail Clipping No Yes 100 – 200 ul
    Retro-Orbital Sinus Required Yes – limited 100 – 200 ul
    Jugular Vein Required Yes 0.5 – 2.0 ml
    Cardiac Puncture (Terminal Only) Required Terminal ~3 ml
  1. Table 4: Gerbil

    Site Anesthesia Repeat Bleeds Expected Volume
    Lateral Tail Vein No Yes 200 – 400 ul
    Toenail Clipping No Yes 100 – 200 ul
    Distal Tail Transection (less than 3mm) Requireda Yes (1-2 times only) 100 – 200 ul
    Retro-Orbital Sinus Required Yes – limited 100 – 200 ul
    Jugular Vein Required Yes 0.5 – 2.0 ml
    Cardiac Puncture (Terminal Only) Required Terminal ~3 ml

    aDistal tail transection in gerbils, and adult rats and mice (>21 days) requires the use of general anesthesia and preemptive analgesia (e.g., NSAIDs, opioids) unless scientifically justified and approved in the IACUC protocol.

  1. Table 5: Guinea Pig

    Site Anesthesia Repeat Bleeds Expected Volume
    Auricular Vein No Yes 50 – 100 ul
    Cephalic Vein No Yes 50 – 100 ul
    Saphenous Vein No Yes 400 – 500 ul
    Jugular Vein Recommended Yes 2 – 3 ml
    Cranial Vena Cava Recommended Yes 2 – 3 ml
    Cardiac Puncture (Terminal Only) Required Terminal
  1. Table 6: Rabbit

    Site Anesthesia Repeat Bleeds Expected Volume
    Marginal Ear Vein / Central Ear Artery Local Anesthesia Recommended Yes 1 – 3 ml
    Lateral Saphenous Vein No Yes
    Cephalic Vein No Yes
    Jugular Vein Recommended Yes
    Cardiac Puncture (Terminal Only) Required Terminal
  1. Table 7: Ferret

    Site Anesthesia Repeat Bleeds Expected Volume
    Cephalic Vein No Yes
    Jugular Vein Recommended Yes
    Anterior Vena Cava Recommended Yes
    Cardiac Puncture (Terminal Only) Required Terminal
  1. Table 8: Cat

    Site Anesthesia Repeat Bleeds Expected Volume
    Medial Saphenous Vein No Yes
    Cephalic Vein No Yes
    Jugular Vein No Yes
  1. Table 9: Dog

    Site Anesthesia Repeat Bleeds Expected Volume
    Lateral Saphenous Vein No Yes
    Cephalic Vein No Yes
    Jugular Vein No Yes
  1. Table 10: Sheep

    Site Anesthesia Repeat Bleeds Expected Volume
    Jugular Vein No Yes
    Cephalic Vein No Yes
    Saphenous Vein No Yes
  1. Table 11: Pig

    Site Anesthesia Repeat Bleeds Expected Volume
    Marginal Ear Vein No Yes
    Cephalic Vein No Yes
    Right Jugular Vein No Yes
    Anterior Vena Cava Recommended Yes
  1. Table 12: Non-Human Primate

    Site Anesthesia Repeat Bleeds Expected Volume
    Femoral Vein Recommended Yes
    Saphenous Vein Required Yes
    Cephalic Vein Required Yes
    Brachial Vein Required Yes
  1. Table 13: Circulating Blood Volumes in Common Lab Animal Species (adopted from Heinz-Diehl, 2001 and Hawk et al. 2005)

    Species Mean Blood Volume (ml/kg) Range of Mean Blood Volume (ml/kg)
    Mouse 72 63 – 80
    Rat 64 58 – 70
    Hamster 78
    Gerbil 67
    Guinea Pig 75 67 – 92
    Rabbit 56 44 – 70
    Ferret 75
    Cat 55 47 – 66
    Dog (Beagle) 85 79 – 90
    Sheep 66 60 – 74
    Minipig 65 61 – 68
    Macaque (Rhesus) 56 44 – 67
    Macaque (Cynomolgus) 65 55 – 75
    Marmoset 70 58 – 82

References

  1. Clemons DJ, Seeman JL. 2011. The Laboratory Guinea Pig. Boca Raton (FL): CRC Press, p. 89-98.
  2. Ebert RV, Stead EA, Gibson JG. 1941. Response of normal subjects to acute blood loss. Arch Int Med; 68:578-90.
  3. BVA/FRAME/RSPCCA/UFAW Joint Working Group on Refinement. 1993. Removal of blood from laboratory mammals and birds (first report). Laboratory Animals; 27:1-22.
  4. Field KJ, Sibold AL. 1999. The Laboratory Hamster and Gerbil. Boca Raton (FL): CRC Press, p.108-112.
  5. Hawk CT, Leary SL, Morris TH. 2005. Formulary for Laboratory Animals. Ames (IO): Blackwell Publishing. p. 157.
  6. Heimann M, Käsermann HP, Pfister R, Roth DR, and Bürki K. 2009. Blood collection from the sublingual vein in mice and hamsters: a suitable alternative to retrobulbar technique that provides large volumes and minimizes tissue damage. Lab Animal; 43: 255-260.
  7. Heinz-Diehl K, Hull R, Morton D, Pfister R, Rabemampianina Y, Smith D, Vidal JM, Vorstenbosch C. 2001. A good practice guide to the administration of substances and removal of blood, including routes and volumes. J Appl Toxicol; 21:15-23.
  8. Hoff J. Methods of blood collection in the mouse. 2000. Lab Animal; 29(10):47-53.
  9. McGuill MW, Rowan AN. 1989. Biological effects of blood loss: Implications for sampling volumes and techniques. ILAR Journal; 31(4):5-20.
  10. Nerenberg ST, Zedler P, Prasad R, Biskup N, Pedersen L. 1978. Hematological response of rabbits to chronic, repetitive, severe bleedings for the production of antisera. J Immunol Meth; 24:19-24.
  11. Otto G, Rosenbald WD, Fox JG. 1993. Practical venipuncture techniques for the ferret. Lab Anim 27:26-29
  12. Scipioni RL, Diters RW, Myers WR, Hart SM. 1997. Clinical and clinicopathologic assessment of serial phlebotomy in the Sprague Dawley rat. Lab Anim Sci; 47(3):293-299.
  13. Scipioni RL, Guidi DA, Stehr JE, Hart SM, Diters RW. 1996. Clinical, hematologic, and clinicochemical assessment of serial blood sample collection in Sprague-Dawley rats. Contemp Top Lab Anim Sci; 35(6):90. [Abstract]
  14. Skavlen PA, Baron SJ, Stevens JO. 1992. Effect of blood collection volumes on the hemograms of rabbits. Contemp Top Lab Anim Sci; 31(4):23. [Abstract]
  15. Villano JS, Sharp PE. 2013. The Laboratory Rat. Boca Raton (FL): CRC press, p. 202-212.
  16. Yale CE, Torhortst JB. 1972. Critical bleeding and plasma volumes of the adult germfree rat. Lab Anim Sci; 22(4):497-502.

SPECIES: Cats / Chickens/Avian / Cows / Dogs / Ferrets / Fish, Amphibians, and Reptiles / Guinea Pigs / Hamsters / Mice / Other Rodents / Primates / Rabbits / Rats / Sheep / Swine

Questions?

Questions or concerns about the content of this document should be directed to the Unit for Laboratory Animal Medicine (ULAM) at (734) 764-0277 or [email protected].

For training on specific blood collection methods and techniques, contact the ULAM Training Core via email at [email protected] or call 734-763-8039.