Platelet Count Test – Indications, Procedures, Results

Last updated: February 8, 2026 Medically reviewed by: RxHarun Orthopedic Specialist Doctor Reading time: 3 min read

Thrombocyte count

A platelet count is a lab test to measure how many platelets you have in your blood. Platelets are parts of the blood that help the blood clot. They are smaller than red or white blood cells.

How the Test is Performed

A blood sample is needed.

How to Prepare for the Test

Most of the time you do not need to take special steps before this test.

How the Test will Feel

When the needle is inserted to draw blood, some people feel moderate pain. Others feel only a prick or stinging. Afterward, there may be some throbbing or slight bruising. This soon goes away.

Why the Test is Performed

The number of platelets in your blood can be affected by many diseases. Platelets may be counted to monitor or diagnose diseases, or to look for the cause of too much bleeding or clotting.

Normal Results

The normal number of platelets in the blood is 150,000 to 400,000 platelets per microliter (mcL) or 150 to 400 x10^9/L.

Normal value ranges may vary slightly. Some lab use different measurements or may test different specimens. Talk to your doctor about your test results.

What Abnormal Results Mean

LOW PLATELET COUNT

A low platelet count is below 150,000. If you do not have enough platelets, you may bleed too much.

If your platelet count is below 50,000, your risk of bleeding is much higher. Even every day activities can cause bleeding. If your platelets are low, you need to know how to prevent bleeding and what to do if you are bleeding.

A lower-than-normal platelet count is called thrombocytopenia . Low platelet count can be divided into 3 main causes:

Not enough platelets are being made in the bone marrow
Platelets are being destroyed in the bloodstream
Platelets are being destroyed in the spleen or liver

3 of the more common causes of this problem are:

Cancer treatments, such chemotherapy or radiation
Drugs and medicines
Autoimmune disorders , in which the immune system mistakenly attacks and destroys healthy body tissue, such as platelets

HIGH PLATELET COUNT

A high platelet count is 400,000 or above

A higher-than-normal number of platelets is called thrombocytosis. It means your body is making too many platelets. Causes may include:

A type of anemia in which red blood cells in the blood are destroyed earlier than normal ( hemolytic anemia )
Anemia due to low iron
After certain infections, major surgery or trauma, or allergic reactions
Cancer
Certain medicines
Bone marrow disease called polycythemia vera
Bone marrow making too many platelets without a known cause ( primary thrombocythemia )
Recent spleen removal

Some people with high platelet counts may be at risk of forming blood clots . Blood clots can lead to serious medical problems

Risks

Veins and arteries vary in size so it may be harder to take a blood sample from one person than another.

Other slight risks from having blood drawn may include:

Excessive bleeding
Fainting or feeling light-headed
Hematoma (blood accumulating under the skin)
Infection (a slight risk any time the skin is broken)

Frequently Asked Questions

Is this article a replacement for a doctor?

No. It is educational content only. Patients should consult a qualified clinician for diagnosis and treatment.

When should I seek urgent care?

Seek urgent care for severe symptoms, rapidly worsening condition, breathing difficulty, severe pain, neurological changes, or any emergency warning sign.

References

Add references, clinical guidelines, textbooks, journal articles, or trusted medical sources here. You can edit this area later with a custom field named _rx_references.

Written by Dr. Harun Ar Rashid, MD - Arthritis, Bones, Joints Pain, Trauma, and Internal Medicine Specialist

Dr. Md. Harun Ar Rashid, MPH, MD, PhD, is a highly respected medical specialist celebrated for his exceptional clinical expertise and unwavering commitment to patient care. With advanced qualifications including MPH, MD, and PhD, he integrates cutting-edge research with a compassionate approach to medicine, ensuring that every patient receives personalized and effective treatment. His extensive training and hands-on experience enable him to diagnose complex conditions accurately and develop innovative treatment strategies tailored to individual needs. In addition to his clinical practice, Dr. Harun Ar Rashid is dedicated to medical education and research, writing and inventory creative thinking, innovative idea, critical care managementing make in his community to outreach, often participating in initiatives that promote health awareness and advance medical knowledge. His career is a testament to the high standards represented by his credentials, and he continues to contribute significantly to his field, driving improvements in both patient outcomes and healthcare practices. Born and educated in Bangladesh, Dr. Rashid earned his BPT from the University of Dhaka before pursuing postgraduate training internationally. He completed his MD in Internal Medicine at King’s College London, where he developed a special interest in inflammatory arthritis and metabolic bone disease. He then undertook a PhD in Orthopedic Science at the University of Oxford, conducting pioneering research on cytokine signaling pathways in rheumatoid arthritis. Following his doctoral studies, Dr. Rashid returned to clinical work with a fellowship in interventional pain management at the Rx University School of Medicine, refining his skills in image-guided joint injections and minimally invasive pain-relief techniques.