Hematocrit 36.4 %

What 36.4 % means — men

A hematocrit of 36.4 % is below the typical adult male range of about 41–50%, consistent with mild to moderate anemia. It's worth a medical appointment in the next week or two.

This is a common lab finding, and most causes are very treatable once identified. That said, guidelines are clear that unexplained anemia in an adult man should always be investigated rather than watched, because slow blood loss from the digestive tract is a frequent and fixable cause. A single mildly low result can also reflect a recent illness, blood donation, or extra fluids, so your doctor may start by repeating the test alongside iron studies.

For adult men, the typical hematocrit reference range is about 41% to 50%, per common US references (Cleveland Clinic cites 41–50% for men). Individual labs vary slightly, and the range printed on your own report governs. Above the range, this page's band boundaries follow widely used clinical conventions: about 52% is the level at which hematology guidance recommends investigating a sustained elevation in men, about 54% is where testosterone-therapy guidance advises reassessing treatment, and 60% and above — the very top of this page's scale — is treated by most laboratories as a critical (panic) value.

Common causes

• Iron deficiency, including from slow, unnoticed gastrointestinal blood loss
• Anemia of chronic disease (long-term inflammation, infection, or autoimmune conditions)
• Chronic kidney disease
• Vitamin B12 or folate deficiency
• Recent blood donation or a recent illness
• Thyroid problems (usually underactive thyroid)
• Dilution from IV fluids or aggressive hydration before the draw
• Medications that suppress bone marrow or cause minor chronic bleeding

Symptoms that can go with it

• Tiredness or reduced exercise tolerance
• Mild shortness of breath with exertion
• Paler complexion than usual
• Occasional headaches or trouble concentrating
• Often no symptoms at all at this level

Sensible next steps

1. Book an appointment with your doctor within the next week or two
2. Expect a repeat CBC plus iron studies, and possibly B12, folate, and kidney function tests
3. Note anything relevant before the visit: recent blood donation, diet changes, NSAID or aspirin use, dark stools
4. Don't start iron supplements on your own — they can mask the cause and cause side effects; discuss the plan with your clinician first

What 36.4 % means — women

A hematocrit of 36.4 % falls comfortably within the normal range for adult women — inside the range every major US reference and laboratory uses. This part of your blood count looks as expected.

The share of your blood occupied by red blood cells is in the expected zone, supporting normal oxygen delivery. It's worth a quick look at the neighboring CBC values — hemoglobin, MCV, and ferritin if it was checked — because iron stores can run low in menstruating women even while hematocrit is still normal. If everything lines up and you feel well, this is a genuinely reassuring result.

For adult women, US references vary more than for men: StatPearls cites about 36% to 48%, while many US labs and references use a lower upper limit of about 44–45% (Cleveland Clinic cites 36–44%). A result in the mid-40s may carry a high flag on your report even though hematology guidance does not recommend investigation below 48%. Your own lab's printed range governs. At the far high end, most laboratories treat 60% and above — the very top of this page's scale — as a critical (panic) value.

Sensible next steps

1. No action needed for this value — continue routine care
2. If you have heavy periods or notable fatigue, ask your clinician about checking ferritin, since iron can be low before hematocrit drops
3. Keep this report for comparison — your personal baseline makes future results easier to interpret