Medically reviewed by Doru Paul, MD A low platelet count—also called thrombocytopenia—means your blood has fewer than 150,000 platelets per microliter. Platelets are cells that help your blood clot.

Some of the medical conditions that can cause thrombocytopenia include viral or bacterial infections, aplastic anemia, leukemia, and myelodysplastic syndromes. Certain medications such as ...