The normal range for platelets in the adult is (/mm^3):

The normal range for platelets in adults is between 150,000 to 500,000 per cubic millimeter (mm³) of blood. This range is crucial for assessing the blood's ability to clot properly. Platelets, also known as thrombocytes, are essential for hemostasis, meaning they help stop bleeding by aggregating at sites of vascular injury and facilitating the coagulation cascade.

Values below this range can indicate thrombocytopenia, which could lead to increased bleeding risk, while values above this range can suggest thrombocytosis, which carries risks for clotting disorders. Understanding the normal platelet count is vital for diagnosing various conditions, monitoring treatment responses in patients undergoing therapies such as chemotherapy, and managing procedures that may involve bleeding.

The other choices do not represent the standard reference range for platelet counts. The values listed in options that suggest much lower or higher platelet counts are either outside the biologically relevant range or not meaningful in a clinical context.