MCH Test Results Explained: What Your Number Means

MCH results, explained

Enter your value to see whether it falls in the typical range and what that means. This is an educational explainer — not a diagnosis, and your entry never leaves your browser.

Enter your MCH value

pg = picograms of hemoglobin per red cell. Don't confuse it with MCHC, a different index measuring concentration.

This is educational, not a diagnosis. Reference ranges vary between labs and assays — the range printed on your report is the one that applies to you, and a single value is interpreted with your history and symptoms by a clinician. Your entry stays in your browser; nothing is stored or sent anywhere.

Reference ranges: MedlinePlus (NIH) — Red Blood Cell (RBC) Indices; NHLBI — Iron-Deficiency Anemia. View source

What MCH measures

MCH is the average amount of hemoglobin packed inside each red blood cell. It tracks closely with MCV — smaller cells generally carry less hemoglobin — so the two usually move together and tell a similar story.

Why the test is done

As part of a CBC's red-cell indices, alongside MCV, to help classify the type of anemia.

Typical reference ranges

Typical adult reference bands for MCH (pg)
Band	What it may mean
Below typical range (hypochromic)	Each red cell is carrying less hemoglobin than usual — cells described as 'hypochromic', or paler than normal. Paired with a low MCV, this is the classic signature of iron deficiency, the most common nutritional deficiency in women and usually driven by menstrual blood loss. Thalassaemia trait produces a similar picture, which is why ferritin is checked rather than assumed.
Within typical range	Roughly 27–33 pg is the common adult reference range. As with the rest of the CBC, a normal MCH does not exclude iron deficiency — iron stores fall first, and the red-cell indices are the last thing to change.
Above typical range	A high MCH usually just reflects larger red cells (a high MCV), so it points in the same direction: B12 or folate deficiency, alcohol, or thyroid disease. It's interpreted with MCV rather than on its own.

Ranges shown are typical adult values from MedlinePlus, National Library of Medicine (NIH); your own lab's printed range applies to you. View source.

Frequently asked questions

What does a low MCH mean?

A low MCH (below about 27 pg) means each red blood cell carries less hemoglobin than normal. Together with a low MCV it's the typical pattern of iron deficiency — most often from heavy periods in women — though thalassaemia trait can look the same. A ferritin test is what separates them.

What's the difference between MCV and MCH?

MCV is the average SIZE of your red blood cells; MCH is the average AMOUNT of hemoglobin inside each one. They usually move together, because smaller cells hold less hemoglobin — so clinicians read them as a pair rather than treating a low MCH as separate information.