Home › Lab markers › Hematocrit
COMPLETE BLOOD COUNT (CBC)
Also printed as: Hct · PCV · Packed cell volume
Educational only — not medical advice.
Hematocrit is the percentage of your blood volume made up of red blood cells. If hemoglobin describes oxygen-carrying protein, hematocrit describes how crowded the blood is with the cells carrying it. The two almost always move together.
Hematocrit is the number most sensitive to hydration on any given day, so it is best read as a trend. It is also the marker most often watched during testosterone therapy, since it rises predictably.
TYPICAL ADULT RANGE
Many labs report roughly 41–53% for adult men and 36–46% for adult women. Ranges vary by lab. Reported in %.
Reference ranges vary by lab, by method, and by age and sex. Always read your own result against the range printed on your report.
Upload your report — every line explained free
Drop in a PDF or a photo of your lab results and get a plain-English breakdown of every marker on it, in the same calm language you just read. No account needed to start.
Explain my lab report →🔒 Secure & encrypted · Free to try
A lower hematocrit usually mirrors a lower hemoglobin, and the same everyday reasons apply — low iron stores, recent blood loss or donation, pregnancy, and endurance training, which expands plasma volume and dilutes the percentage as a normal adaptation. Being well hydrated at the draw lowers it too. Your doctor will pair it with ferritin and MCV to see what is behind it.
The most common reason for a high hematocrit is simply being dehydrated when the blood was drawn, which concentrates the sample. Altitude, smoking, sleep apnea, and testosterone therapy raise it for real. On TRT it is expected to climb, which is exactly why it gets monitored on a schedule — that monitoring conversation, including whether and when to adjust anything, belongs with your prescriber. A single high reading is usually rechecked well hydrated before anyone acts on it.
Your doctor is the one who can read this number against your history, symptoms, and medications.
Educational only — not medical advice. Lab results only mean something alongside your history, symptoms, medications, and the rest of your panel. Bring questions to your doctor; they are the one who can interpret your results for you.
All lab markers · Upload a report · About E-Labus · Privacy
© E-Labus. Educational only — not medical advice.
Hi, I'm Ellie.
Your whole health story — one intelligence.