How may platelets are needed by a human being to survive?

A healthy adult typically has between 150,000 to 450,000 platelets per microliter of blood. While the body can function with lower platelet counts, severe thrombocytopenia (below 20,000 platelets per microliter) can lead to serious bleeding issues and may be life-threatening. Therefore, maintaining a platelet count within the normal range is crucial for survival and proper blood clotting.