Hematocrit (Hct)
- Sample Type
- Standard
- Fasting
- No
- Unit
- %
Hematocrit measures the volume percentage of red blood cells (RBCs) in whole blood. It is a critical indicator of oxygen-carrying capacity and blood viscosity. In a Complete Blood Picture, the Hct is used to screen for, diagnose, and monitor anemia or polycythemia. Because it is a ratio of cells to plasma, it is highly sensitive to the patient's hydration status.
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Enter your lab result to see where you stand compared to the standard reference range.
Why Context Matters
Hct is a concentration-dependent measurement. A patient with severe dehydration may show a 'normal' or even 'high' Hct despite being anemic, because the plasma volume is reduced. High-altitude residence or chronic smoking can also physiologically elevate Hct, requiring specialized interpretation.
Lab ranges are statistical averages, not biological laws. "Normal" for a 20-year-old male isn't normal for a 60-year-old female.
Clinical References
Source-of-truth databases and clinical guidelines for Hematocrit (Hct):
Official Sources
- Hematocrit Test: MedlinePlus Medical TestMedlinePlus
- Hematocrit test - Mayo ClinicMayo Clinic
- Hematocrit: MedlinePlus Medical EncyclopediaMedlinePlus
Research & Guidelines
- PubMed: Hematocrit (Hct) Clinical GuidelinesNCBI / PubMed
Related Indicators
Medically Reviewed by Dr. Binoy Babu, MBBS
Board Certified Doctor • 10+ Years Clinical Experience
Dr. Babu is a practicing physician dedicated to empowering patients with clear, actionable medical information. He founded 2opi to bridge the gap between complex lab reports and patient understanding, ensuring everyone has access to a reliable second opinion.
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