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Hematocrit (Hct)

Test Overview

The Hematocrit (Hct) test measures the percentage of red blood cells (RBCs) in the blood. It helps assess overall blood volume and oxygen-carrying capacity and is commonly used to diagnose anemia, dehydration, and other blood disorders.

Test Uses

  • Diagnose and monitor anemia (low RBC levels).
  • Detect dehydration or fluid overload.
  • Assess overall blood health and oxygen transport efficiency.
  • Monitor conditions like polycythemia (high RBC levels) or blood loss.

Hematocrit (Hct) Test Results & Ranges

Test Component:Normal Range:Abnormal (Possible Conditions):
Hematocrit (%) – Men38.3 – 48.6%Low Hct → Possible anemia, blood loss, overhydration, bone marrow disorders.
High Hct → Possible dehydration, polycythemia, lung disease, heart disease.
Hematocrit (%) – Women35.5 – 44.9%Same as above.
Hematocrit (%) – Children31.0 – 43.0%Low Hct → Possible nutritional deficiencies or blood disorders.
  • Lower Hct levels may indicate anemia, bleeding, or bone marrow suppression.
  • Higher Hct levels may indicate dehydration, lung disease, or polycythemia vera.

 

Expected Turnaround Time

  • Results Available: Typically within 24 hours.

Specimen Requirements

  • Sample Type: Blood sample (venipuncture or fingerstick).
  • Container: Lavender-top tube (EDTA anticoagulant).

Collection Instructions

  • Fasting: Not required.
  • Hydration status may affect results (dehydration can falsely elevate hematocrit).

Test Details

Clinical Use: The hematocrit test is often part of a Complete Blood Count (CBC). It helps assess the body’s ability to transport oxygen and detect blood-related conditions. Used to monitor chronic conditions, such as kidney disease or heart disease, that affect red blood cell production.

Limitations: Hematocrit can fluctuate with hydration levels, altitude, and recent blood loss. Additional tests (Hemoglobin, RBC count, Iron studies) may be needed to determine the underlying cause of abnormal results.

The Hematocrit (Hct) test is essential for evaluating blood health, oxygen transport, and diagnosing conditions like anemia or dehydration.

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