Which of the following values would be considered a normal platelet count?

A normal platelet count typically ranges from about 150,000 to 450,000 platelets per cubic millimeter of blood. Therefore, a count of 250,000 per cubic millimeter falls comfortably within this normal range. It indicates adequate platelet production and function, which is essential for normal hemostasis and blood clotting processes.

The other values fall outside of the normal range. A count of 100,000 per cubic millimeter is indicative of thrombocytopenia, which is a condition characterized by low platelet levels that can increase the risk of bleeding. A count of 500,000 per cubic millimeter indicates thrombocytosis, a condition of elevated platelet levels that might lead to complications such as thrombosis. Lastly, a count of 700,000 per cubic millimeter further emphasizes severe thrombocytosis, increasing the risks associated with high platelet count, including clotting events. Thus, 250,000 per cubic millimeter is the only value that aligns with the established normal range.