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Hematocrit Test
✅ Up to date🔬 Evidence: ModerateHematology
Diğer adları: Haematocrit, Hct, Packed cell volume
⚠️
Discuss your test results with your doctor. This page is for informational purposes only and does not provide a diagnosis.
⚡ Key Facts
• Measures the percentage of blood volume occupied by red blood cells
• Men: 40–54% | Women: 36–48%
• Closely parallels hemoglobin — both assess oxygen-carrying capacity
• Affected by hydration status
🧪 What Does This Test Measure?
The hematocrit test measures the percentage of blood volume occupied by red blood cells, closely paralleling hemoglobin as an indicator of oxygen-carrying capacity.
📋 Why Is It Ordered?
Ordered for anemia and polycythemia evaluation, fluid balance monitoring, preoperative assessment, and general health screening.
🔧 Preparation
Part of the CBC. No special preparation is required.
📊 Reference Ranges
Men: 40–54%
Women: 36–48%
Pregnant women: physiological decrease in the second trimester
⚠️ Reference ranges vary by laboratory.
⬆️ High Values
Elevated hematocrit may be associated with dehydration, chronic lung disease, high altitude, smoking, or polycythemia vera.
⬇️ Low Values
Low hematocrit may be associated with anemia, fluid overload, acute bleeding, or physiological dilution during pregnancy.
⚙️ What Can Affect Results?
Dehydration, fluid overload, tourniquet duration, body position, pregnancy, altitude, and smoking may affect hematocrit results.
🔬 Evidence Summary
Moderate evidence: 1 guideline and 4 reviews/observational studies.
✅ Key Takeaways
💡
What you learned: Hematocrit reflects the red blood cell proportion in blood. It closely parallels hemoglobin and is affected by hydration status.
⛔
A hematocrit result alone cannot diagnose anemia or polycythemia. Hemoglobin, clinical context, and additional tests are needed.
🔬 Sources Used on This Page
5 sources · Most recent publication: 2024📋
Guideline
Expert society and guideline recommendations
1
source
📖
Review
Comprehensive topic evaluation
3
sources
👁
Observational
Observational and cohort studies
1
source
Overall assessment: Evidence level for this topic is moderate. This page is supported by 1 guideline, 3 reviews, 1 observational study.
📝 Questions to Ask Your Doctor
Be prepared for your appointment. Add questions to your list.
Last reviewed: 4/2/2026
Next review: 7/2/2026
⚖️ Comparisons
🔗 Related Topics
🧪 Hemoglobin (paralel parametre)🧪 Hemogram (tam kan sayımı)🧪 MCV (ortalama eritrosit hacmi)🧪 Ferritin (demir depoları)
⚖️ 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.
Content is based on scientific studies indexed in PubMed and current clinical guidelines.