Blood health
Platelet count (PLT)
PLT, thrombocytes
Included in every MyHealthspan membership: Focus, Baseline, and Complete.
Compare membershipsTiny fragments that help stop bleeding.
Platelets are tiny cell fragments made in your bone marrow that clump together to seal damaged blood vessels. Your platelet count is one input when looking at bleeding and clotting, and it can shift with inflammation, infection, and iron levels.
A high count is often a reaction to something else.
When platelets run high, the cause is often reactive: an infection, an inflammatory condition, iron deficiency, or recent blood loss. In these cases the platelets usually work normally, and the count tends to settle as the underlying cause improves. Less often, a bone marrow condition makes too many platelets.
Low platelets can follow a viral infection, certain medications, heavy alcohol use, liver disease, or an immune reaction against platelets.
Questions
Can a low platelet result be a lab error?
It can be. Platelets sometimes clump together in the collection tube, so an automated counter reads fewer than are really there. This is called pseudothrombocytopenia. If a low result doesn't fit the rest of your picture, a clinician may ask for a repeat test or a look at the blood under a microscope.
Should I worry about bleeding or clotting?
Small changes near the edge of the reference range are read in context. Counts far outside it are followed up promptly. A clinician considers symptoms such as easy bruising or nosebleeds, your medications, and your other results.