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A 31-year-old female asked:

The last two times i donated blood, it clotted in the tube/needle. i drank lots of water the day before & day of. i'm an active, healthy 31yo female.

2 doctor answers4 doctors weighed in
Dr. Ed Friedlander
Pathology 44 years experience
Thanks for donating: That happens sometimes and is not an indicator of poor health. Best wishes.
Dr. Julie Abbott
Preventive Medicine 45 years experience
Blood may clot: if the flow is very slow. There is an anti-coagulant in the collection bag but the blood must flow fast enough to reach the bag before it has time to clot.It was a good idea to try to expand your blood volume with generous water drinking but you may have small veins and the blood just doesn't travel that fast. But talk to your doc about clotting tests especially if family history of clotting issue

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Last updated May 31, 2016

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