MCHC
Also known as: Mean Corpuscular Hemoglobin Concentration
What Does MCHC Measure?
MCHC, or Mean Corpuscular Hemoglobin Concentration, measures the average concentration of hemoglobin within a given volume of red blood cells. Specifically, it calculates how densely packed hemoglobin is inside your red blood cells, expressed as grams per deciliter (g/dL) or as a percentage. It is calculated by dividing the total hemoglobin concentration by the hematocrit (the proportion of blood volume occupied by red blood cells) and multiplying by 100.
Why Does MCHC Matter?
MCHC is a critical component of the complete blood count (CBC) and helps doctors classify different types of anemia and other red blood cell disorders. A low MCHC (hypochromia) indicates that red blood cells are pale and under-filled with hemoglobin, which is a hallmark of iron deficiency anemia and thalassemia. A high MCHC (hyperchromia) can signal conditions like hereditary spherocytosis or severe dehydration. Because hemoglobin is the protein responsible for carrying oxygen throughout your body, abnormalities in its concentration directly affect how efficiently your tissues receive oxygen, making MCHC an essential diagnostic tool for evaluating fatigue, weakness, and other symptoms related to poor oxygenation.
Normal Ranges
Males
33.4–35.5 g/dL
Females
33.4–35.5 g/dL
Children
Varies by age; typically 32–36 g/dL for most pediatric ranges
Causes of High Levels
- Hereditary spherocytosis – red blood cells are abnormally sphere-shaped and more densely packed with hemoglobin
- Autoimmune hemolytic anemia – destruction of red blood cells leads to increased hemoglobin concentration in remaining cells
- Severe dehydration – reduced plasma volume artificially concentrates hemoglobin
- Sickle cell disease – abnormal hemoglobin polymerization can elevate MCHC readings
- Laboratory artifact – lipemia, high white blood cell counts, or cold agglutinins can falsely elevate MCHC
- Burns or trauma – extensive tissue damage can alter red blood cell morphology and concentration
Causes of Low Levels
- Iron deficiency anemia – insufficient iron reduces hemoglobin production, leaving red blood cells pale and under-filled
- Thalassemia – genetic disorders that impair hemoglobin synthesis result in hypochromic red blood cells
How to Improve Your MCHC
Diet
- Eat iron-rich foods daily such as lean red meat, chicken, turkey, oysters, and beef liver to support hemoglobin synthesis
- Include plant-based iron sources like lentils, spinach, tofu, fortified cereals, and pumpkin seeds, especially if vegetarian or vegan
- Consume vitamin C-rich foods (oranges, bell peppers, strawberries) alongside iron-rich meals to enhance non-heme iron absorption by up to 3-fold
- Avoid drinking coffee or tea with iron-rich meals as tannins can inhibit iron absorption by up to 60%
- Ensure adequate protein intake (0.8–1.2 g per kg of body weight) since amino acids are essential building blocks for hemoglobin
Supplements
- Iron supplementation: ferrous sulfate 325 mg (65 mg elemental iron) taken 1–3 times daily on an empty stomach, as directed by a physician
- Vitamin C: 500 mg taken alongside iron supplements to significantly enhance absorption
- Vitamin B6 (pyridoxine): 25–50 mg daily, as it plays a cofactor role in heme biosynthesis
- Copper: 1–3 mg daily, as copper deficiency can impair iron metabolism and hemoglobin production
- Folate (folic acid): 400–800 mcg daily to support overall red blood cell health and production
Related Biomarkers
Frequently Asked Questions
What does a low MCHC mean on a blood test?
A low MCHC, also called hypochromia, means your red blood cells contain less hemoglobin than normal and appear pale under a microscope. This is most commonly caused by iron deficiency anemia, where insufficient iron limits hemoglobin production. It can also result from thalassemia, anemia of chronic disease, or lead poisoning. A low MCHC is typically accompanied by other abnormal CBC values such as low MCV (small red blood cells) and low hemoglobin, which together help your doctor diagnose the specific type of anemia and determine appropriate treatment.
What does a high MCHC mean?
A high MCHC, or hyperchromia, means your red blood cells have an unusually high concentration of hemoglobin. True hyperchromia is relatively rare and is most classically associated with hereditary spherocytosis, a genetic condition where red blood cells are round and compact rather than the normal biconcave disc shape. It can also occur in autoimmune hemolytic anemia. Importantly, a high MCHC reading can sometimes be a laboratory artifact caused by conditions like lipemia (high fat in blood), severe cold agglutinin disease, or very high white blood cell counts, so results should always be interpreted in context with other tests.
Is MCHC the same as hemoglobin?
No, MCHC and hemoglobin are related but different measurements. Hemoglobin measures the total amount of hemoglobin in a volume of blood, typically expressed in g/dL. MCHC, on the other hand, measures the concentration of hemoglobin specifically within the red blood cells themselves — essentially how densely packed the hemoglobin is inside each cell. You can have a normal total hemoglobin level but still have an abnormal MCHC if the red blood cells are unusually large or small, or if hemoglobin is not distributed evenly within them.