How low must platelet count be before blood donation is not allowed?

The normal platelet count range is (100–300) × 10^9/L. Blood donation is not recommended when the platelet count is below 100 × 10^9/L. Donating blood may further reduce the platelet count in the bloodstream, which could increase the risk of bleeding and affect health in individuals whose platelet levels are already low.

Platelets are cell fragments in the blood that play a crucial role in clotting. Their primary function is to participate in the coagulation process and prevent bleeding when blood vessels are injured. If platelet levels are low, blood donors may face risks of bleeding complications, such as bleeding or bruising at the puncture site. Additionally, a low platelet count may indicate poor blood quality or a suboptimal health status in the donor. Blood donation might worsen existing conditions or trigger other complications.

Prior to donating blood, donors must undergo strict health screening and evaluation to ensure they are in good health, that their platelet count is within the normal range, and that other related parameters meet the requirements for blood donation. This ensures the safety and effectiveness of the blood donation process.