You are interviewing a potential blood donor, and you ask the individual how much she weighs. What is the purpose of this question?
1. National guidelines dictate that the donor's body weight must be greater than 50 kg (110 lb) to donate 450 mL of blood.
2. The donor's body weight determines how rapidly the blood can be taken from the donor.
3. The donor's body weight helps determine the presence of an infection.
4. The donor's body weight determines how long the individual must remain lying down after the blood donation.
National guidelines dictate that the donor's body weight must be greater than 50 kg (110 lb) to donate 450 mL of blood.
Rationale:
Weight must be greater than 50 kg (110 lb) to donate 450 mL of blood. This is a national guideline put forth by the American Red Cross. The donor's weight determines how much blood can be taken, not how fast it can be taken. There is not correlation of weight to rates of infection. Body weight is not related to length of time needed to rest after blood donation.
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