Understanding Hematocrit: Normal vs Optimal Ranges

?What is Hematocrit?

Haematocrit (PCV or packed cell volume) is the percentage of blood volume occupied by red blood cells. It is closely related to haemoglobin — typically: haematocrit ≈ haemoglobin × 3. Low haematocrit indicates anaemia; high haematocrit can indicate polycythaemia (too many red cells) or dehydration.

!Why It Matters

Haematocrit helps assess severity of anaemia, guide blood transfusion decisions, and evaluate polycythaemia. It is used in conjunction with haemoglobin and RBC count for a comprehensive red cell assessment.

Reference Ranges

Lab normal ranges may vary between laboratories. Optimal and longevity targets are based on research literature and should be interpreted with your physician.

Symptoms of Imbalance

• Same as haemoglobin extremes — anaemia or polycythaemia

How to Improve Your Levels

• 1For low haematocrit: correct iron, B12, or folate deficiency and investigate blood loss
• 2Eat iron-rich foods with vitamin C; limit tea/coffee with meals, which blocks iron absorption
• 3For high haematocrit: maintain good hydration, as dehydration falsely raises the value
• 4Stop smoking and screen for sleep apnoea if haematocrit is persistently high
• 5Treat underlying lung, kidney, or marrow conditions driving the abnormality

When to Test

Part of complete blood count.

Related Biomarkers