Hematocrit

Definition

Hematocrit (Hct) is the percentage of blood volume composed of red blood cells. It is approximately 3 times the hemoglobin value and is used to assess oxygen-carrying capacity and fluid status.

Normal Values

• Males: 42 to 52%
• Females: 37 to 47%
• Newborns: 44 to 64%

Clinical Implications

• Low Hct: Anemia, bleeding, hemodilution, pregnancy, renal failure.
• High Hct: Dehydration, polycythemia, COPD, smoking, high altitude.

Nursing Considerations

Monitor trends; acute drop suggests active bleeding, such as correlate with hemoglobin, symptoms, and clinical context. Transfuse per protocol for hemodynamically significant anemia. Ensure adequate fluid intake for elevated Hct (unless contraindicated). Assess for signs of bleeding or volume shifts.

NCLEX Relevance

Remember the '3:1' relationship between Hgb and Hct. Low Hct + tachycardia + hypotension = bleeding.