Hematocrit

Red blood cell picture

Hematocrit (Hct) Levels

This is the ratio of the volume of red cells to the volume of whole blood. Normal range for hematocrit is different between the sexes and is approximately 45% to 52% for men and 37% to 48% for women. This is usually measured by spinning down a sample of blood in a test tube, which causes the red blood cells to pack at the bottom of the tube.

What is a normal hematocrit?

The normal ranges for hematocrit are depend on the age and, after adolescence, the sex of the individual. The normal ranges are:

  • Newborns: 55% to 68%
  • One (1) week of age: 47% to 65%
  • One (1) month of age: 37% to 49%
  • Three (3) months of age: 30% to 36%
  • One (1) year of age: 29% to 41%
  • Ten (10) years of age: 36% to 40%
  • Adult males: 42% to 54%
  • Adult women: 38% to 46%

These values may vary slightly among different laboratories. Continue Reading

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Reviewed on 10/29/2015

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