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Any disease which is transmittable through blood, such as hepatitis or HIV. That includes things like the flu or bacterial infections.

Any recent (within a year) piercings with non-sterile instruments or sharing of needles (such as in the case of a diabetic who injects insulin--obviously if you are on illegal injectable drugs you should not be donating blood). If the instruments were sterile, or if you are the only person to use your insulin needles, you're fine to donate.

Pregnancy or recent childbirth, as there may be danger to the mother or baby.

Small physical size--if you are a small person, your blood volume is lower and it may not be safe for you to lose a whole pint of blood. (I found this out the hard way when my doctor took less than that for blood tests and I ended up passing out on her floor. I now have doctor's orders not to donate.)

Low iron levels, again because it may not be safe for you to lose that much blood.

There are other reasons, such as suspicion of mad cow disease or malaria, but those are the main ones you're likely to run into. There is also a minimum age, usually 17 or 18.

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16y ago
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15y ago

To be a blood donor you have to be at least 21 years old, no sexually transmitted disease, no anemia, no hypertension, not drunk within a week and have not been a donor for at least three months.

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13y ago

Any disease, virus, or infection in your blood, including a simple common cold. Also low blood count, (anaemic). You have to be more than 7 stone. And they can be a bit dubious if you've been to some foreign countries within the last 6 months.

Intoxication of any substance and you will be refused also.

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12y ago

Donors with a history of heart, lung, or liver disease or who are pregnant are usually deferred. Donors can be disqualified if they are known to have engaged in behavior that put them at risk of infection

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13y ago

Among these factors are having had a tattoo, having had sex with people in high-risk groups, having had certain diseases, and having been raped.

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13y ago

These conditions include hepatitis, AIDS, cancer, Heart disease, Asthma, malaria, bleeding disorders, and high blood pressure.

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Q: What would prevent you from donating blood?
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Related questions

Does having herpes prevent you from donating plasma?

Currently having chicken pox (herpes virus) would prevent you from donating plasma (since you would be 'unwell'). Having had chicken pox in the past will not prevent you donating plasma or blood. Currently having shingles ( a reactiviation of the chicken pox virus) would prevent you from donating plasma/blood (again, you would be considered 'unwell'). However having a cold-sore (again, herpes virus), or minor herpes on a small patch of skin should not prevent you from being able to donate plasma/blood.


Can you get HIV through donating blood?

You won't get HIV through donating blood.


What happens if you smoke marijuana before donating blood?

It might be really weird to give blood while you are intoxicated, I would not recommend it. Don't do it. If they run a Tox screen on the donations, yours will be discarded.If you are donating for money and they find out, you will be barred from donating.


What happens to donors of infected blood?

Donors of infected blood are entered into the Donor Deferral Register, a confidential national data base used to prevent deferred people from donating blood.


What would you expect to see in elevated numbers in a peripheral blood sample after donating a pint of blood?

erythrocytes


Can you donate blood with uncontrolled diabetes type 2?

If you take insulin, you are not eligible to donate. The rationale is that donating blood could interrupt your blood glucose control, and potentially lead to a hypoglycemic reaction in the clinic or on the way home. If you manage your diabetes with lifestyle or diabetes pills, you may be eligible, depending on your overall health. Many people who have type 2 diabetes have blood pressure and heart problems, which would prevent them from donating.


S it bad donating blood a day before surgery?

is it bad donating blood a day before surgery?


What would you expect to see in increased numbers in a peripheral blood sample after donating a unit of blood?

reticulocytes by jawed akbari


Does donating plasma cause leg cramps?

Specefically, no. However, donating plasma is essentially donating blood. A loss of blood can caus fatigue, tiredness, and also leg cramps.


Do you have to keep donating blood after you do it once?

no


How long should you wait to fly after donating blood?

you should wait for 48 hours after donating blood before you go flying


Will donating blood reduce uric acid levels?

yes, by donating blood, uric acid level can be reduced at minimal extend .........