🩸 Hematology

Platelet: What It Means for Your Health

Platelets (thrombocytes) are small cell fragments produced by megakaryocytes in the bone marrow. They play a critical role in hemostasis — the process that stops bleeding by forming clots at injury sites. Platelet count is routinely measured in a CBC. Both abnormally high and low counts can have significant clinical implications, from excessive clotting to uncontrolled bleeding.

Full Name
Platelet Count (PLT)
Normal Range
150–400 10^3/uL
Also Known As
Platelet Count, PLT, Thrombocyte

Reference Range

LowNormal: 150–400 10^3/uLHigh

Reference ranges may vary between laboratories, age groups, and sexes. The values shown are general adult reference ranges. Always compare your results to the specific range provided by your testing laboratory.

What Is Platelet?

Platelets (thrombocytes) are small cell fragments produced by megakaryocytes in the bone marrow. They play a critical role in hemostasis — the process that stops bleeding by forming clots at injury sites. Platelet count is routinely measured in a CBC. Both abnormally high and low counts can have significant clinical implications, from excessive clotting to uncontrolled bleeding.

Commonly included in:

Complete Blood Count (CBC)Coagulation Panel

What Does High Platelet Mean?

Above 400 10^3/uL

Elevated platelet count (thrombocytosis) can be reactive — triggered by infection, inflammation, iron deficiency, surgery, or cancer — or primary, caused by bone marrow disorders like essential thrombocythemia. High platelets increase the risk of blood clots, which can lead to stroke or deep vein thrombosis.

What Does Low Platelet Mean?

Below 150 10^3/uL

Low platelet count (thrombocytopenia) can result from decreased production (bone marrow failure, leukemia, B12/folate deficiency), increased destruction (immune thrombocytopenia, TTP, HUS), or sequestration in an enlarged spleen. Symptoms include easy bruising, petechiae (tiny red spots), prolonged bleeding from cuts, and nosebleeds.

Related Biomarkers in Hematology

Hemoglobin
Oxygen-carrying protein found inside red blood cells.
Range: 12–17.5 g/dL
Hematocrit
Percentage of blood volume occupied by red blood cells.
Range: 36–50 %
WBC
Total white blood cell count measuring immune system activity.
Range: 4.5–11 10^3/uL
RBC
Total number of red blood cells in your blood.
Range: 4–5.5 10^6/uL
MCV
Average size of your red blood cells.
Range: 80–100 fL
MCH
Average amount of hemoglobin per red blood cell.
Range: 27–33 pg

Track Your Platelet Over Time

Upload your blood test results to Hemoly and see how your Platelet levels change over time. Get trend analysis, educational insights, and a personal health timeline.

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Medical Disclaimer

This information is for educational purposes only and is not intended as medical advice, diagnosis, or treatment. Reference ranges may vary between laboratories. Always consult a qualified healthcare professional for interpretation of your blood test results and before making any health decisions.