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Platelet (Thrombocyte) Count

⚠️ Update approaching🔬 Evidence: ModerateHematology
Diğer adları: Platelet count, PLT, Thrombocyte count
⚠️

Discuss your test results with your doctor. This page is for informational purposes only and does not provide a diagnosis.

⚡ Key Facts

• Measures the number of platelets (thrombocytes) circulating in the blood • Normal: 150,000–450,000/µL • Part of the CBC • Both high and low counts require clinical evaluation

🧪 What Does This Test Measure?

The platelet count measures the number of thrombocytes circulating in the blood, which are essential for blood clotting and wound repair.

📋 Why Is It Ordered?

Ordered for bleeding or clotting disorder evaluation, hematologic disease assessment, preoperative screening, and medication monitoring.

🔧 Preparation

Part of the CBC. No special preparation is generally required. EDTA-induced pseudothrombocytopenia should be considered if count is unexpectedly low.

📊 Reference Ranges

Normal: 150,000–450,000/µL (150–450 × 10⁹/L) Mild thrombocytopenia: 100,000–150,000/µL Moderate: 50,000–100,000/µL Severe: <50,000/µL ⚠️ Reference ranges vary by laboratory.

⬆️ High Values

Elevated platelets (thrombocytosis) may be associated with infection, iron deficiency, post-surgical response, or myeloproliferative disorders.

⬇️ Low Values

Low platelets (thrombocytopenia) may be associated with immune thrombocytopenia, medication effects, liver disease, bone marrow disorders, or pseudothrombocytopenia.

⚙️ What Can Affect Results?

Pseudothrombocytopenia (EDTA artifact), pregnancy, exercise, medications, and daily variation may affect platelet results.

🔬 Evidence Summary

Moderate evidence: 1 guideline, 1 systematic review, and 5 reviews.

📚 Most Important Studies on This Topic

1

American Society of Hematology 2019 guidelines for immune thrombocytopenia

Guideline· Blood Advances · 2019 · PMID: 31794604

2

Thrombocytopenia: Evaluation and Management

Review· American Family Physician · 2022 · PMID: 36126009

3

Thrombocytosis: Diagnostic Evaluation, Thrombotic Risk Stratification, and Risk-Based Management Strategies

Review· Thrombosis · 2011 · PMID: 22084665

✅ Key Takeaways

💡

What you learned: Platelet count reflects clotting capacity. Both thrombocytopenia and thrombocytosis require evaluation for underlying causes.

⛔

A platelet count alone cannot diagnose a clotting disorder. Clinical context and additional tests may be needed.

🔬 Sources Used on This Page

7 sources · Most recent publication: 2024
📋
Guideline
Expert society and guideline recommendations
1
source
📊
Systematic review / meta-analysis
Combined analysis of multiple studies
1
source
📖
Review
Comprehensive topic evaluation
5
sources
Overall assessment: Evidence level for this topic is strong. This page is supported by 1 guideline, 1 systematic review/meta-analysis, 5 reviews.

📝 Questions to Ask Your Doctor

Be prepared for your appointment. Add questions to your list.

📋 References

[PMID: 38269572] Essential thrombocythemia: 2024 update on diagnosis, risk stratification, and management. American Journal of Hematology, 2024.
[PMID: 36126009] Thrombocytopenia: Evaluation and Management. American Family Physician, 2022.
[PMID: 35444886] Gestational Thrombocytopenia: A Review on Recent Updates. Cureus, 2022.
[PMID: 33557431] Pseudothrombocytopenia — A Review on Causes, Occurrence and Clinical Implications. Journal of Clinical Medicine, 2021.
[PMID: 31794604] American Society of Hematology 2019 guidelines for immune thrombocytopenia. Blood Advances, 2019.
[PMID: 23121994] A systematic evaluation of laboratory testing for drug-induced immune thrombocytopenia. Journal of Thrombosis and Haemostasis, 2013.
[PMID: 22084665] Thrombocytosis: Diagnostic Evaluation, Thrombotic Risk Stratification, and Risk-Based Management Strategies. Thrombosis, 2011.
Last reviewed: 4/2/2026
Next review: 4/2/2027

🔗 Related Topics

🧪 Hemogram (tam kan sayımı)🧪 Ferritin (demir eksikliği-trombositoz ilişkisi)🧪 CRP (enflamatuvar trombositoz değerlendirmesi)🧪 D-dimer (pıhtılaşma değerlendirmesi)
⚖️ This page does not replace medical advice. Make treatment decisions with your doctor.
Content is based on scientific studies indexed in PubMed and current clinical guidelines.