A normal platelet count is between 150 and 450 billion per liter for both men and women, according to Mayo Clinic. A platelet count that is lower or higher than normal is often a sign of an underlying medical condition, though it may also be a side effect of medication.
A platelet count test is part of a complete blood count test, which also measures red blood cell count, hemoglobin, hematocrit and white blood cell count. When a platelet count is found to be outside the normal range, additional diagnostic testing is required to determine the cause. Mayo Clinic recommends patients consult a medical professional to discuss complete blood count results that fall outside the normal ranges.