Optimize
← All biomarkers
Anemia

MCH

MCH is the average amount of hemoglobin contained in each red blood cell.

What is MCH?

MCH measures how much haemoglobin each red blood cell contains on average, expressed in picograms. A low MCH means cells are poorly filled with haemoglobin — the most common pattern with iron deficiency. A high MCH fits larger cells, as seen with a B12 or folate deficiency. MCH is a calculated value that changes more slowly than ferritin but faster than haemoglobin. That makes it useful as an early trend marker: it can shift before haemoglobin itself falls.

Why is MCH relevant?

MCH gives direction when assessing anaemia. Low MCH with low MCV points to iron deficiency or thalassaemia trait; high MCH with high MCV fits B12 or folate deficiency. Adding RDW sharpens the distinction: in iron deficiency RDW is elevated, in thalassaemia trait it usually stays normal. For people starting supplementation, MCH is a useful marker to track whether treatment is working — normalisation typically occurs within 6–12 weeks.

MCH high or low — what it means

Read MCH alongside MCV, MCHC, RDW, and haemoglobin. Add ferritin and transferrin saturation with a low MCH, and B12 plus folate with a high MCH. A mildly abnormal MCH without other abnormalities is rarely immediately concerning — a repeat at persistent symptoms gives more certainty.

MCH reference ranges

Normal (NVKC, SI)NVKC reference for healthy adults; no separate male/female range.1.70-2.10 fmol
Normal (international)Common international unit; some labs use 27-31 pg. Corresponds to 1.70-2.10 fmol (conversion factor approx. 16.1).27-33 pg

MCH is not measured directly but calculated from haemoglobin and the red blood cell count. Cut-offs and units (fmol vs pg) vary by lab and method — always use the reference interval printed on your own result. MCH says little on its own; read it together with MCV, MCHC, RDW, haemoglobin, and your iron status.

Educational information only — not medical advice. Consult a healthcare professional for clinical decisions.

Read about our scientific approach →Read the guide: Energy →

Frequently asked questions

What is a normal MCH value?

In healthy adults the NVKC puts MCH roughly between 1.70 and 2.10 femtomoles (fmol) per red blood cell. In the international unit that corresponds to about 27-33 picograms (pg). There is no separate normal value for men and women. Always use your own lab's reference interval, since units and cut-offs differ between labs.

What does a low MCH mean?

An MCH below about 1.70 fmol (around 27 pg) means your red blood cells contain less haemoglobin on average ('pale' cells). The most common pattern is iron deficiency, usually together with a low MCV. Thalassaemia trait also lowers MCH — there the RDW often stays normal, whereas in iron deficiency it is typically elevated. A low MCH usually prompts checking ferritin and transferrin saturation.

What does a high MCH mean?

An MCH above about 2.10 fmol (around 34 pg) fits larger red blood cells that hold more haemoglobin. This is classically seen with a vitamin B12 or folate deficiency, usually alongside a raised MCV (macrocytic picture). A high MCH often leads to additional B12 and folate testing to find the cause.

When is an abnormal MCH concerning?

A mildly abnormal MCH without other abnormalities is rarely immediately concerning — repeating the test if symptoms persist gives more certainty. It becomes more relevant when MCH forms a clear pattern with haemoglobin, MCV, MCHC, and RDW — for example a low MCH plus low haemoglobin (iron-deficiency anaemia) or a high MCH plus high MCV (B12/folate deficiency). With symptoms such as fatigue, paleness, or breathlessness, or a clearly abnormal result, discuss it with a clinician.

How do I read my MCH value?

MCH says little on its own; always read it together with MCV, MCHC, RDW, and haemoglobin. A low MCH usually prompts checking ferritin and transferrin saturation, a high MCH vitamin B12 and folate. Because MCH is a calculated value that shifts faster than haemoglobin, it is also useful as an early trend marker and to see whether supplementation is working — normalisation typically occurs within 6-12 weeks.

Related biomarkers

MCV
MCV is the average size of your red blood cells and helps distinguish the type of anemia.
MCHC
MCHC shows how concentrated the hemoglobin inside your red blood cells is.
RDW
RDW shows how much your red blood cells vary in size from one another.
Erythrocytes (RBC Count)
Erythrocytes are your red blood cells, and the RBC count measures them per volume of blood to gauge oxygen transport.

MCH is one of the biomarkers in the Optimize blood test. Book a blood draw at any of 238+ partner labs in the Netherlands, or upload your existing results in the app.

See the full test