Mean Corpuscular Hemoglobin Concentration (MCHC)
The mean corpuscular hemoglobin concentration (MCHC) measures the average concentration of hemoglobin within red blood cells. It is a key parameter in complete blood count diagnostics.
Things worth knowing about "Mean Corpuscular Hemoglobin Concentration"
The mean corpuscular hemoglobin concentration (MCHC) measures the average concentration of hemoglobin within red blood cells. It is a key parameter in complete blood count diagnostics.
What is the Mean Corpuscular Hemoglobin Concentration (MCHC)?
The mean corpuscular hemoglobin concentration, commonly abbreviated as MCHC, is a laboratory value derived from a complete blood count (CBC). It describes the average concentration of hemoglobin – the oxygen-carrying protein – within a single red blood cell (erythrocyte). The MCHC is expressed in grams per deciliter (g/dL) and provides important information about the quality and composition of red blood cells.
How is the MCHC Calculated?
The MCHC is calculated using two other blood count parameters:
- Hemoglobin (Hb): the total amount of hemoglobin in the blood
- Hematocrit (Hct): the proportion of red blood cells relative to total blood volume
The formula is: MCHC = Hemoglobin (g/dL) ÷ Hematocrit × 100
Modern hematology analyzers calculate this value automatically as part of a standard blood count.
Normal Values for MCHC
In adults, the reference range for MCHC is generally between 31.5 and 36.0 g/dL. Slight variations may occur depending on the laboratory. Reference values for newborns and children may differ from those of adults.
What Does an Abnormal MCHC Value Mean?
Low MCHC (Hypochromia)
A low MCHC value indicates that the red blood cells contain less hemoglobin than normal – a condition referred to as hypochromic anemia. Common causes include:
- Iron deficiency anemia: the most frequent cause of a reduced MCHC
- Thalassemia: an inherited disorder affecting hemoglobin synthesis
- Chronic inflammatory diseases that impair iron metabolism
- Sideroblastic anemia: a condition in which iron cannot be properly incorporated into hemoglobin
High MCHC (Hyperchromia)
An elevated MCHC value is less common and may indicate:
- Hereditary spherocytosis: an inherited condition in which red blood cells have an abnormal spherical shape
- Autoimmune hemolytic anemia
- Severe dehydration
- Measurement errors caused by hemolysis of the blood sample (breakdown of red blood cells after collection)
Clinical Significance of MCHC
The MCHC is evaluated alongside other blood count parameters such as MCV (mean corpuscular volume) and MCH (mean corpuscular hemoglobin) to help differentiate between various types of anemia. This combination allows healthcare providers to identify the underlying cause of anemia more precisely and to guide appropriate treatment decisions.
When is MCHC Measured?
The MCHC is routinely measured as part of a complete blood count (CBC). Common indications include:
- Evaluation of fatigue, exhaustion, or pallor
- Suspected anemia
- Monitoring of patients with known blood disorders
- Routine health check-ups and preventive screenings
- Follow-up after the start of treatment (e.g., iron supplementation therapy)
References
- Bain, B. J. et al. - Dacie and Lewis Practical Haematology, 12th Edition. Elsevier, 2017.
- World Health Organization (WHO) - Haemoglobin concentrations for the diagnosis of anaemia and assessment of severity. WHO/NMH/NHD/MNM/11.1, Geneva, 2011. Available at: https://www.who.int/vmnis/indicators/haemoglobin
- Hoffmann, J. J. M. L. et al. - MCHC: Analytical variation and clinical utility. Clinical Chemistry and Laboratory Medicine, 2012.
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