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Facts blood donors should know

Date updated: Fri, Feb 26, 2010
By Bolohealth
Reviewed by Dr Varsha Pancholi, Pooja Blood Bank, Mumbai

Blood transfusions are used to save lives. They can make good, blood loss in victims of accidents or burns, and those undergoing cardiac surgery or treatment for blood cancer, thalassemia and other diseases. In India itself, there is a demand for 7 million units (or pints) of blood for transfusion annually.

While many of us are willing to donate blood, we need to keep in mind certain factors that regulate who can donate blood, and who may not.

What are the basic requirements for donating blood?
Any healthy person between 18 – 60 years can donate blood. Some important requirements for the donor include:
  • Weight of at least 45 kg
  • Hemoglobin level of above 12.5g/dl
  • Pulse rate between 80 – 100 beats/min
  • Temperature not above 99.5oF
  • Normal blood pressure (within 110/60 to 160/90 mmHg)
A donor may donate either whole blood, or just a part of the blood such as the plasma or the platelets (known as apheresis). He should have had a good night’s sleep the night before the day of the donation. He should not be fasting; he should have eaten and had adequate fluids in the hours before donation. These requirements safeguard the health of the donor.

How frequently can one donate blood?
Whole blood donors can donate once every 3 months. Plasma donors can donate once every 48 hours and platelet donors can donate up to 24 times in a year.

How much blood is drawn during each session of blood donation?
One unit, equal to about a pint (350 – 450 ml) of blood is drawn during each session, and the process takes about 10 minutes in the case of a donation of whole blood. In case the donor is giving only plasma, the procedure takes about 1 – 2 hours and a larger quantity of blood is drawn.

How long does it take to replenish one unit of blood that has been donated?
The blood volume or plasma is replenished in the body within 48 hours of donation. It takes 4¬ – 8 weeks for the red blood cells to be completely replaced.

Does one have any symptoms after donation?
The average adult has about 8 – 12 pints, or 4 – 5 liters, of blood in the body. By donating one pint of blood, no physical changes are noticed.

Are there circumstances in which a person cannot donate blood?

Persons suffering from certain conditions or in certain situations should not donate blood. These include:

Cancers or HIV: To avoid risk of transmission, people with HBV, HCV, HIV or syphilis infection should not donate blood. People with leukemia (blood cancer) or other cancers of the blood also cannot donate. Those whose cancers have been successfully treated – where there hasn’t been a relapse for more than 12 months – are eligible to donate.

Heart disease: People with heart disease have to wait for 6 months – after an episode of angina or heart attack or if they have undergone bypass surgery or an angioplasty – before they can donate blood. In case of people fitted with a pacemaker, blood donation is advisable only if their pulse is between 50 and 100 beats per minute.

Infectious diseases: People suffering from infectious diseases should wait for specific period – even after recovery – to ensure that the condition is completely cured. Wait periods in case of the following conditions are:
  • Tuberculosis (TB) – 3 years
  • Jaundice and malaria – 1 year
  • Typhoid, chicken pox, measles or mumps, persistent fever or unexplained weight loss – 1 year
Diabetes: People with diabetes whose blood sugar is well-controlled with insulin or oral hypoglycemic drugs are eligible to donate.

Blood pressure: People with either high or low blood pressure can donate blood as long as their blood pressure is well-controlled and within the limit allowed for donors.

Minor infections: Those with skin diseases, rash, allergies, cold or cough should also wait to donate blood till the condition has resolved. It is important to wait until any antibiotic treatment that the individual is taking is complete before donating blood.

Epilepsy: Individuals who suffer seizures or epilepsy can donate blood if free of seizures for at least two years and are not at greater risk for adverse reactions if taking regular treatment.

Vaccinations: As long as fever and other symptoms are absent, one can immediately donate blood after a vaccination.

Medical procedures: Those who have undergone blood transfusion or a minor surgery or dental procedure may need to wait for 6 months before donating blood.

Medication: People who are taking antibiotics for any infection should wait for three days after they stop taking them or are symptom free.

Alcohol: It is prudent to wait for 24 hours after consuming alcohol, before donating blood. Alcohol lowers blood pressure, so donating blood too soon after consuming alcohol puts you at risk of fainting.

Self-injection habit: Those in the habit of taking steroids, hormonal supplements or drugs should not donate blood as these practices puts them at risk for various blood borne infections such as HIV.

Are there any specific requirements for women who wish to donate blood?
Women who are pregnant, lactating or have recently had an abortion should not donate blood. It is also better to avoid donating blood during menstruation. This is because it can lead to the risk of anemia for the donor.

Also read: Youngsters more willing to donate blood

Tags: Blood, Donor

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