Platelet Count in Whole Blood (Automated Hematology)

Why This Test Might Be Ordered

Your healthcare provider may order a platelet count to check for conditions like low or high platelet levels, which can cause bleeding problems, easy bruising, or increased risk of blood clots. It’s also used during pregnancy, before surgeries, or if you have symptoms like unexplained bruising, nosebleeds, or bleeding gums.

What to Expect Before the Test

You won’t need special preparation for this test. It’s a simple blood draw from a vein in your arm, usually done by a phlebotomist. The process is quick and most people feel minimal discomfort. Avoid heavy exercise or aspirin-based medications for 24 hours before the test if your provider recommends it.

What the Results Mean

Platelet counts are typically reported in thousands of platelets per microliter (thousands/µL). A lower than normal count (thrombocytopenia) may indicate conditions like leukemia, liver disease, or certain medications. A higher than normal count (thrombocytosis) could be linked to infections, inflammation, or blood disorders.

Common Causes of Abnormal Platelet Counts

Low platelet counts can result from bone marrow disorders, autoimmune diseases, or medications that suppress platelet production. High platelet counts may be caused by infections, chronic inflammation, or certain cancers. Your provider will discuss these findings with you and may recommend further testing if needed.