What is MCHC?
Of the three cell values the blood count calculates, MCHC is the most refined: the haemoglobin divided by the share of red cells, so how much oxygen carrier sits per litre of cell. It corrects MCH for cell size. A large cell with plenty of haemoglobin and a small cell with little can have the same MCHC; they are both equally full for their size. Only when the cell has too little haemoglobin for its size does the MCHC fall, and that happens in an iron deficiency and in thalassaemia. That makes MCHC the slowest and least sensitive of the cell values. In an iron deficiency MCV and MCH fall together, and the division of the two stays put for a long time; only in a deficiency that has lasted a while do the cells enter the blood so pale that the concentration falls too. In a B12 or folate deficiency MCHC does not change at all, because the oversized cells are proportionally just as full. Your report shows MCHC in mmol/L; internationally in g/dL. Normal is about 19 to 22 mmol/L, the same for men and women and at every age. There is not always a band beside it. A cell can only be filled up to a certain limit, and that is why a high MCHC is rare and usually says something about the measurement.
Why is MCHC relevant?
MCHC is rarely the value you learn something new from, but it is the value that confirms a picture. In an iron deficiency already working through into production, MCV and MCH sit low; if MCHC falls with them, the deficiency is clear and no longer early. In a B12 or folate deficiency MCHC actually stays normal while MCH and MCV sit high, and that difference helps tell the two kinds of anaemia apart. For anyone topping up iron, MCHC is the last of the cell values to recover, and so a sign that the marrow is making completely normal cells again. The high side is different from the other cell values. A red cell can only be filled with haemoglobin up to a certain limit, so a genuinely high MCHC hardly ever occurs. If it is there anyway, nine times out of ten it is a measurement artefact: cold antibodies that make the cells clump in the tube, plenty of fat in the blood after a meal, or a tube that has haemolysed. That is usually recognised at the measurement itself, and a repeat settles it. The one real reason for a high MCHC is worth knowing: hereditary spherocytosis, in which the cells are ball-shaped and therefore more densely filled. It goes together with a mild anaemia, occasional slight jaundice and an enlarged spleen, often runs in families, and is very manageable once it is known.
MCHC reference ranges
What counts beside the number:
- MCV and MCH, which point the same way in a real abnormality
- Haemoglobin, because without anaemia a slightly abnormal MCHC says little
- Ferritin with a low value: low in iron deficiency, normal in thalassaemia
- Whether you were fasting, because fat in the blood disturbs the measurement
- With a high value: reticulocytes and bilirubin, which rise with it in spherocytosis
- A repeat, because a single abnormal MCHC is more often the measurement than the cell
MCHC is one of the few cell values without a difference between men and women, and it barely changes with age. Dutch labs report in mmol/L, international sources in g/dL. A cell can only be filled up to a limit, so a value above the band is usually a measurement artefact and rarely a real finding. Always read MCHC beside MCV, MCH and haemoglobin.
MCHC = haemoglobin divided by haematocrit
mmol/L
÷ =
What Dutch labs actually use
19 – 22mmol/L
At Certe this is normal.
every lab calls 19 – 22 mmol/L normal. Outside that range every lab calls it abnormal.
Every age, per lab
| Laboratory | Group | Reference range |
|---|---|---|
| Certe2026 | All ages | 19–22 mmol/L |
Each band as the lab publishes it, retrieved in 2026, unless marked otherwise.
MCHC high or low: what it means
A low MCHC means cells that hold too little haemoglobin for their size. From common to rare: an iron deficiency that has lasted a while, and thalassaemia trait. In both cases MCV and MCH sit low too; ferritin says which of the two it is. A low MCHC with normal MCV and MCH is usually a matter of rounding and says nothing. A high MCHC is usually a measurement artefact: cold antibodies, fat in the blood or a haemolysed tube. Have blood drawn again fasting, and the value usually sits back within the band. If it stays high, with a mild anaemia, occasional jaundice and many reticulocytes, that fits hereditary spherocytosis, and then investigation of the cell shape belongs with it. What you do about it: with a low value from iron deficiency you refill the store, with red meat, fish, legumes and green vegetables with vitamin C, and where needed an iron tablet every other day; MCHC is the last cell value to recover, so count on three to four months. With a high value you do nothing, except have blood drawn again fasting. Set MCHC beside MCV, MCH and haemoglobin, and beyond that beside ferritin with a low value. A single slightly abnormal MCHC with an otherwise normal blood count asks for a repeat, not for an explanation.
What lowers it
Cells that hold too little haemoglobin for their size.
| Cause | How often |
|---|---|
| Iron deficiencyIn a deficiency that has lasted a while the cells enter the blood so pale that the concentration falls too; MCV and MCH already sit low and so does ferritin | Often |
| Thalassaemia traitSmall, pale cells from an inherited feature; MCHC falls slightly, ferritin is normal and iron does not help | Sometimes |
What raises it
Usually the measurement, rarely the cell.
| Cause | How often |
|---|---|
| Measurement artefactCold antibodies that make cells clump in the tube, plenty of fat in the blood after a meal, or a haemolysed tube; a fasting repeat settles it | Often |
| SpherocytosisAn inherited cell shape in which the cells are ball-shaped and more densely filled; goes together with a mild anaemia, occasional jaundice and many reticulocytes | Rare |
How does a MCHC blood test work?
- Referral
- Not needed. MCHC is in every blood count you can have measured yourself.
- Fasting
- Not strictly needed, but plenty of fat in the blood after a meal can make the value read falsely high; with an unexpectedly high value you repeat fasting.
- When
- At any time; the value changes over months, not over days.
- The draw
- One tube of blood from a vein in your arm, the same tube as for the rest of your blood count; MCHC is calculated from haemoglobin and haematocrit.
- Repeating
- With an unexpectedly high value again fasting; with a low value after three to four months of iron, because MCHC recovers last.
- Which test
- MCHC is in the Iron & fatigue test (€99) and in .
- Where to draw
- You can draw at 250+ locations near you, no referral needed. See the locations
Frequently asked questions
What is MCHC?
The average concentration of haemoglobin in a red blood cell: haemoglobin divided by haematocrit. The difference from MCH sits in the denominator: MCH is the amount per cell, MCHC that same amount divided by the cell volume. So MCHC says how full a cell is for its size, not how much sits in it.
What is a normal MCHC level?
About 19 to 22 mmol/L, the same for men and women and at every age. Not every lab prints a band for it. A cell can only be filled up to a limit, so the top of the band is almost a natural maximum, and a value above it usually says something about the measurement.
What does a low MCHC mean?
Cells that hold too little haemoglobin for their size. That is an iron deficiency that has lasted a while, or thalassaemia trait; in both cases MCV and MCH sit low too, and ferritin says which of the two it is. In a B12 deficiency MCHC stays normal, because the larger cell is proportionally just as full. A slightly lowered MCHC with normal MCV and MCH says little.
What does a high MCHC mean?
Usually a measurement artefact, because a cell can only be filled up to a limit. Cold antibodies make cells clump in the tube, plenty of fat in the blood after a meal disturbs the measurement, and so does a haemolysed tube. Have blood drawn again fasting. If the value stays high with a mild anaemia, occasional jaundice and many reticulocytes, that fits hereditary spherocytosis, a ball-shaped cell form that runs in families.
What is the difference between MCH and MCHC?
MCH is how much haemoglobin sits in a cell; MCHC is how densely it is packed, so corrected for the size of the cell. In an iron deficiency both fall, because the cells are small and pale. In a B12 or folate deficiency MCH rises while MCHC stays normal, because the larger cell is proportionally just as full. MCH responds earlier; MCHC confirms.
Why does MCHC recover last?
Because it is the slowest of the cell values. After topping up iron the reticulocytes rise first, then the haemoglobin, then MCH and MCV, and only once the marrow is making completely normal cells again and the old, pale cells have been broken down does the concentration come back. Count on three to four months, and see a normal MCHC as the sign that it is done.
What is spherocytosis?
An inherited condition in which the red cells are ball-shaped instead of disc-shaped because of a weak cell skeleton. They are therefore more densely filled, with a high MCHC, and are broken down faster in the spleen, with a mild anaemia, occasional slight jaundice, an enlarged spleen and many reticulocytes. It runs in families and is very manageable once it is known.
Do I need to fast for an MCHC test?
Not strictly, but plenty of fat in the blood after a meal can make the value read falsely high, so with an unexpectedly high value you repeat fasting. MCHC comes from the same tube as your whole blood count, so MCV, MCH and haemoglobin sit beside it automatically.
Which tests include MCHC?
MCHC is in the Iron & fatigue test (€99, also as an add-on for €15), in the Biological age test (€69, also as an add-on for €15), in the comprehensive test (€229) and in .
Related biomarkers
Read on
Sources
- 1.Certe, test catalogue (Dutch): MCHC. 2026. bepalingenwijzer.certe.nl
- 2.LESA Laboratory diagnostics (Dutch primary-care laboratory agreement). 2026. richtlijnen.nhg.org
- 3.NHG guideline on anaemia (M76), Dutch College of General Practitioners. 2024. richtlijnen.nhg.org
Educational information only, not medical advice. Consult a healthcare professional for clinical decisions.
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