HCT, or hematocrit, measures the percentage of red blood cells in your blood. It's a key part of complete blood counts (CBCs) and helps diagnose conditions like anemia or polycythemia.
Blood consists of plasma (liquid) and cells (red, white, platelets). HCT calculates red blood cells' volume as a percentage of total blood volume. For example, a 45% HCT means 45% of your blood is red cells.
Ranges vary by age, sex, and altitude. The Mayo Clinic reports:
| Group | Normal Range (%) |
|---|---|
| Men | 40.7-50.3% |
| Women | 36.1-44.3% |
| Children | Varies by age (e.g., newborns: 55-68%) |
High-altitude residents often have higher HCT due to lower oxygen levels.
During a routine checkup, my HCT was 42%. My doctor noted it was slightly low and ordered additional tests, which revealed mild iron-deficiency anemia. Treatment with dietary changes and supplements normalized my levels within months.
HCT is a important but often overlooked metric in blood work. Understanding its role helps patients advocate for their health and seek proper treatment when results fall outside normal ranges.