The mean corpuscular hemoglobin concentration, a measure of the concentration of hemoglobin in a given volume of packed red blood cells. It is reported as part of a standard complete blood count.
It is calculated by dividing the hemoglobin by the hematocrit. Reference ranges for blood tests are 32 to 36 g/dl, or between 4.9 to 5.5 mmol/L. It is thus a mass or molar concentration. Still, many instances measure MCHC in percentage (%), as if it was a mass fraction (mHb / mRBC). Numerically, however, the MCHC in g/dl and the mass fraction of hemoglobin in red blood cells in % are identical, assuming a RBC density of 1g/mL and negligible hemoglobin in plasma.
Read more about Mean Corpuscular Hemoglobin Concentration: Interpretation, Complications With Cold Agglutinin, Worked Example