Question

what can be archived prevented proper checking of blood before blood donation
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Answer 1

It can be checked by a medical test

Answer 2

Eat a healthy meal before yourdonation. Avoid fatty foods, before donating. Tests for infections done on all donated blood can be affected by fats that appear in your blood for several hours after eating fatty foods. *second is we should check the type of the blood ex;A+,B+,O+etc