What It Measures
MCH measures the average weight of hemoglobin — the oxygen-carrying protein — contained in a single red blood cell. It is calculated by dividing total hemoglobin by the red blood cell count, expressed in picograms (pg). This value helps determine whether red blood cells are carrying a normal, high, or low amount of hemoglobin.
Mean Corpuscular Hemoglobin (MCH) measures the average amount of hemoglobin per red blood cell. It is a key component of a complete blood count (CBC) that helps diagnose and classify different types of anemia, providing insight into how effectively red blood cells carry oxygen throughout the body.
Current Value
What High Means
Elevated MCH (>33 pg) indicates macrocytic anemia, where red blood cells are larger than normal and contain excess hemoglobin. Common causes include vitamin B12 deficiency, folate deficiency, hypothyroidism, liver disease, chronic alcohol use, and certain medications (methotrexate, hydroxyurea). Myelodysplastic syndromes and reticulocytosis can also elevate MCH. High MCH is often associated with megaloblastic anemia driven by impaired DNA synthesis in red blood cell precursors.
Possible Symptoms
Fatigue, weakness, pallor, shortness of breath, numbness or tingling in hands and feet (B12/folate deficiency), cognitive difficulties, glossitis (swollen tongue), mood changes, diarrhea, unsteady gait, jaundice (if hemolysis present).
What Low Means
Low MCH (<27 pg) indicates microcytic or hypochromic anemia, where red blood cells are smaller and/or carry less hemoglobin than normal. The most common cause is iron deficiency anemia, but it can also result from thalassemia, chronic disease/inflammation, lead poisoning, or sideroblastic anemia. Low MCH suggests the body cannot produce adequate hemoglobin, often due to insufficient iron stores, impaired iron absorption, or chronic blood loss.
Possible Symptoms
Fatigue, weakness, pallor, shortness of breath on exertion, dizziness, cold hands and feet, brittle nails, headaches, poor concentration, restless legs, pica (craving non-food items like ice), rapid heartbeat, exercise intolerance.
Risk Factors
Iron deficiency anemia, vitamin B12 deficiency, folate deficiency, thalassemia, chronic kidney disease, hypothyroidism, liver disease, chronic alcohol use, celiac disease, inflammatory bowel disease, heavy menstrual bleeding, malabsorption syndromes, lead exposure, myelodysplastic syndromes.
Actionable Advice
Supplements
- •Iron (ferrous bisglycinate)
- •Vitamin B12 (methylcobalamin)
- •Folate (methylfolate)
- •Vitamin C (enhances iron absorption)
- •Copper
- •Vitamin B6 (pyridoxal-5-phosphate)
- •Liver/organ meat supplements
Diet & Lifestyle
- •Eat iron-rich foods: red meat, liver, shellfish, dark leafy greens, legumes
- •Pair iron-rich foods with vitamin C sources to enhance absorption
- •Avoid coffee/tea within 1 hour of iron-rich meals (tannins inhibit absorption)
- •Include B12-rich foods: eggs, fish, meat, dairy, or supplement if plant-based
- •Include folate-rich foods: leafy greens, lentils, asparagus, avocado
- •Limit alcohol consumption to protect folate metabolism and liver function
- •Cook with cast iron cookware to increase dietary iron intake
- •Get regular blood work to monitor CBC trends over time
- •Address underlying gut health issues that may impair nutrient absorption
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Historical Trend
Related Biomarkers
Resources & Studies
All Readings
| Date | Value | Change |
|---|---|---|
| 2025-09-18 | 29.2 pg | -0.5 |
| 2025-08-25 | 29.7 pg | +0.1 |
| 2025-07-31 | 29.6 pg | +0.2 |
| 2025-06-27 | 29.4 pg | — |