Normal HCT Levels


HCT is an abbreviation of "hematocrit." It is a routine blood test that is used as a marker of general health. Most commonly, it is checked prior to surgery and often with hospital admissions.


  • HCT is the proportion of blood that is expressed as a percentage of the red blood cells (erythrocytes) to the rest of the blood constituents.


  • A blood sample is obtained and sent to the lab to be measured. The HCT is calculated based on the total volume of red blood cells and the amount of hemoglobin (the red part of the blood).

Normal HCT Levels in Adults

  • Normal HCT levels in women are 38 to 46 percent. Women naturally have a lower HCT level than men. Normal HCT levels in men are 42 to 54 percent.

Normal HCT Levels in Children

  • HCT levels in children vary with age. A newborn level should be 55 to 68 percent. By one month, normal levels are 37 to 49 percent. At the end of one year, 29 to 41 percent, and at 10 years, 36 to 40 percent. After puberty, the ranges are dependent on the patient's gender.

Causes of low HCT levels

  • Anemia is the medical term for a low HCT levels. It is most often caused by a loss of blood. Another common cause is iron deficiency in the diet. Sickle cell anemia and certain types of kidney problems will often cause HCT levels to be low, as well.


  • High HCT levels can be caused by dehydration, and people living at high altitudes often exhibit raised HCT levels. A side effect of chronic smoking is increased HCT levels.

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  • "Taber's Cyclopedic Medical Dictionary"; 2009
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