What are normal hematocrit test results?

The range for normal tests varies due to age and gender, but the general guidelines are:

  • Male: 41% to 50%
  • Female: 36% to 44%

For babies, normal results are:

  • Newborn: 45% to 61%
  • Infant: 32% to 42%

Your doctor will determine what is normal for you or your child.

What if I get a hematocrit result outside of the normal range?

Hematocrit results outside of the normal range, whether low or high, can indicate a serious medical condition. Your healthcare provider can interpret your individual results and come up with the best treatment plan for your underlying condition.

Low hematocrit results can indicate:

  • Blood loss
  • Leukemia or other bone marrow problems
  • Iron and vitamin deficiency, including folate, vitamin B12, and vitamin B6
  • Too much water in the body
  • Kidney disease
  • Thyroid abnormality
  • Immune destruction of red blood cells

High hematocrit may be due to:

  • Heart disease
  • Dehydration
  • Scarring or thickening of the lungs
  • Bone marrow disease
  • Obstructive sleep apnea
  • Smoking
  • Carbon monoxide poisoning
  • Testosterone use

Last reviewed by a Cleveland Clinic medical professional on 01/12/2018.


  • Billett HH. Hemoglobin and Hematocrit. In: Walker HK, Hall WD, Hurst JW, editors. Clinical Methods: The History, Physical, and Laboratory Examinations. 3rd edition. Boston: Butterworths; 1990. Chapter 151. Accessed 2/13/2018.

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