Thrombocytopenia Differential Diagnosis

Investigation of platelet counts below 150,000/µL and their underlying causes.

Written by: Saygı Hospital Health Guide Editorial Board

Last updated: June 11, 2026

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

References (5)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Dahiliye (İç Hastalıkları) department. Book Appointment →

What is Thrombocytopenia Differential Diagnosis?

Thrombocytopenia is defined as a platelet count below 150,000/µL in peripheral blood. It develops via three main mechanisms: decreased production (marrow failure, B12/folate deficiency), increased destruction (ITP, TTP, HIT, DIC) and splenic sequestration (hypersplenism).

The first step is to exclude pseudothrombocytopenia (in vitro EDTA-induced platelet clumping). Peripheral blood smear examination is critical in the diagnostic workup: schistocytes suggest TTP/HUS, blasts suggest leukaemia.

Treatment depends on the underlying cause. Urgent intervention is required when the platelet count is below 10,000/µL or active bleeding is present.

Symptoms

Petechiae and purpura on the skin

Gum bleeding and epistaxis

Easy bruising

Heavy menstrual bleeding

Gastrointestinal bleeding (in severe cases)

Intracranial haemorrhage (with very low counts)

Risk Factors

Autoimmune disorders (ITP, SLE)

Viral infections (HIV, HCV, EBV)

Bone marrow disorders

Heparin use (HIT)

Chronic liver disease and hypersplenism

Chemotherapy and radiotherapy

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

Unexplained skin petechiae or bruising
Increasing gum or nasal bleeding
Low platelet count detected on blood tests
Severe headache with bleeding signs (emergency)

Treatment Methods

ITP: Corticosteroids, IVIG, anti-D immunoglobulin

TTP: Emergency plasma exchange and corticosteroids

HIT: Discontinue heparin and start alternative anticoagulation

Production failure: Treat the underlying cause

Splenectomy (in chronic refractory ITP)

Platelet transfusion (active bleeding — except TTP)

Which Department to Visit?

You can visit our Dahiliye (İç Hastalıkları) department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

Learn About Dahiliye (İç Hastalıkları) Department

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You can make an appointment with our specialists or contact us for your concerns.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.