Blood Sample Collection

Human Subject Protection and IRB Consideration

Overview

Blood draws are a common practice in any line of medical research. In clinical practice, a physician may look at the results to diagnose a condition. However, in research settings many samples of blood are analyzed to gain data to answer the research question. For example, researchers may study blood samples to determine if the quantity of a particular hematological protein contributes to the development of a disease state. Regardless of the research purpose, federal guidelines are set in place to justify the quantity of blood taken from subjects for their protection. In addition, it is integral that blood specimens are only taken with an intended purpose in order to minimize risks to human participants. This purpose can include clinical diagnostics, research purposes, and biobanking. If possible, research samples should be obtained at time of standard of care collections. Investigators are encouraged to utilize results of standard of care labs to minimize duplication of results or labs and minimize risk to the participant.

IRB Classification

For IRB review involving less than minimal risk, the following guidelines must be met. If the research protocol involves greater than minimal risk, the protocol must be submitted to the IRB and wait to get full board approval.

  • The sample must be collected through finger stick, heel stick, ear stick, or
  • The subject must be healthy, non-pregnant, at least 110
  • The amount of blood may not exceed 550 This amount can only be collected through a maximum of an eight week period.
  • For age and weight based consideration, the volume collected should not exceed either 50 mL or 3 mL/kg. This amount can only be collected through a maximum of an eight week
  • The collection frequency can not be more than two times per
  • Expedited category involves less than minimal risk.

If any of these criteria are not met, the IRB will do a full board review. In addition, the IRB may require further study to determine if the level of risk identified is appropriate to the study. If they believe the risk level is not appropriate, a full board review will be conducted to make those changes.

To determine the risk category, there are two classifications:

  • Healthy: having none to minimal blood draws for clinical
  • Affected: having larger amounts of blood drawn for clinical reasons. The allowable limit is generally decreased for this population because of possible blood transfusions between blood draws.
Collection Process

Collection of blood is done by finger stick, heel stick, ear stick, or venipuncture. The cumulative level of blood drawn from a healthy adult should not exceed 550 mL over an eight-week period. In terms of age and weight, the amount of blood drawn should not exceed either 50 mL or 3 mL per kilogram. The maximum collection frequency is two times per week. No more than three skin punctures should be made in a single collection.

Classification of an Adult Subject

For a research purposes of blood draws, an adult is defined as meeting the following requirements:

  • At least 18 years old
  • At least 110 pounds
  • Not pregnant
  • Self reporting as healthy on the day of blood draw
    • No flu or cold symptoms the day of blood draw
    • No infections in the two week period prior to blood draw
    • No symptoms of heart condition six months prior to blood draw
    • No diagnosis of sickle cell disease
Blood Volume Range

The following table outlines blood volume range for healthy individuals.

Age Total Blood Volume Range (mL/kg)
Preterm Infant 90-105
Term Infant 80-85
1-12 months 75-80
1-3 years 70-80
Older children and adults 65-80
Blood Volume Ranges in Affected Individuals

Body Weight (kg)

24 hour period collection (2.5% of total blood volume)

30 day period (5% ot total blood volume)

1

2.5

5

2

5

10

3

6

12

4

8

16

5

10

20

6

12

24

7

14

28

8

16

32

9

18

36

10

21

40

16-20

32-40

64-80

26-30

52-60

104-120

36-20

72-80

144-160

46-50

92-100

184-200

56-60

112-120

224-240

66-70

132-140

264-280

76-80

152-160

304-360

86-90

172-180

344-360

96-100

192-200

384-400

Blood Volume Ranges in Healthy Individuals

Body Weight (kg)

24 hour period collection (3% of total blood volume)

30 day period (10% of total blood volume)

1

3

10

2

6

20

3

7.2

24

4

9.6

32

5

12

40

6

14.4

48

7

16.8

56

8

19.2

64

9

21.6

72

10

24

80

16-20

38.4-48

128-160

26-30

62.4-72

208-240

36-20

86.4-96

288-320

46-50

110.4-120

368-400

56-60

134.4-144

448-480

66-70

158.4-168

528-560

76-80

182.4-192

608-640

86-90

206.4-216

688-720

96-100

230.4-240

768-800

 

Risk Minimization

Investigators should modify their research protocol for patients that would be placed at a health related risk from a standard blood draw procedure. Exceptions to keep in mind of include:

  • Severely Sick Patients: For patients that have a health condition, researchers should consider limiting the standard maximal amount of blood drawn. Prior review of patient hemoglobin levels is also recommended. Possible conditions include but are not limited to anemia, low cardiac output, blood pressure problems, pulmonary issues, diabetes, or heart related disease. For these scenarios, it is also suggested to have an overseeing physician in the case of an Furthermore, it is also encouraged that participants note any health related issues when filling out the informed consent form.
  • Extra Sticks: The use of extra sticks should be minimized and also consider the reasoning for the draw. For example, consider if it is clinically indicated or if it is used for biobanking. Consider setting a limit as to how many times a participant can be struck for a standard blood draw.
  • Iron Supplementation and Hemoglobin Monitoring: Extra parameters may need to be monitored when drawing blood from children or possible immunocompromised
Consent Process

Just like any research study, a fully executed informed consent must be implemented prior to drawing blood. Researchers should provide a general description of how the blood will be drawn as well as outline possible risks. These risks include pain, slight bruising, light headed, nauseous, or even fainting. To minimize these risks, participants should have at least two glasses of water and a snack prior to a blood draw (modified for fasting based blood draws). They should also closely be monitored right after their blood is drawn to note for any lightheadedness or possible fainting.