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Platelets

Published: July 27, 2026Updated: August 25, 2026

Platelets are small blood cells that help the body form clots to stop bleeding. This biomarker measures the concentration of platelets in the blood.

Quick summary

Platelets are essential for blood clotting and their levels are measured in 10^3/μL.

Medically reviewed by WellAlly Editorial TeamLast reviewed August 25, 2026Editorial policy

Key facts at a glance

Units
10^3/μL
Clinical utility
diagnostic
Result kind
quantitative
FDA-cleared
Sysmex Platelets, Abbott Platelets, Siemens Platelets
interpretation: {"text":"May indicate conditions such as thrombocytopenia, leukemia, or an enlarged spleen.","label":"Low Platelet Count"}; {"text":"May suggest thrombocytosis, inflammation, or chronic infections.","label":"High Platelet Count"}

Platelets, also known as thrombocytes, are tiny cell fragments in the blood that play a crucial role in blood clotting. They are produced in the bone marrow and are essential for hemostasis, the process that stops bleeding.

A platelet count is a common test in hematology that assesses the number of platelets in a given volume of blood. The reference range for platelet count is typically between 150–400 x 10^3/μL.

Abnormal platelet counts can indicate various medical conditions. A low platelet count (thrombocytopenia) may suggest bone marrow disorders, while a high platelet count (thrombocytosis) can be associated with inflammation or blood disorders.

Frequently asked questions

What does a low platelet count mean?
A low platelet count, or thrombocytopenia, can be caused by bone marrow disorders, viral infections, or certain medications.
What does a high platelet count indicate?
A high platelet count, or thrombocytosis, may indicate inflammation, iron deficiency, or certain blood disorders.
  1. 1
    Mayo Clinic: Platelet CountSource
  2. 2
    American Society of HematologySource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy