MCH Lab Results: Normal Range & What High or Low MCH Means
Also known as: Mean corpuscular hemoglobin, MCH blood test
MCH (mean corpuscular hemoglobin) is the average amount of hemoglobin contained in a single red blood cell, reported on a complete blood count (CBC). It closely tracks with red-cell size, so it helps classify anemia. A normal MCH is roughly 27–33 picograms (pg); a low MCH often reflects iron deficiency, while a high MCH is commonly linked to vitamin B12 or folate deficiency.
MCH normal range
| Category | Range (pg) |
|---|---|
| Normal | 27–33 pg |
| Low | < 27 pgOften iron deficiency |
| High | > 33 pgOften B12 / folate deficiency |
Reference ranges vary by laboratory. Use the range printed on your own report as the definitive comparison.
What high MCH can mean
- Vitamin B12 deficiency
- Folate deficiency
- Liver disease
- Alcohol use
What low MCH can mean
- Iron-deficiency anemia (the most common cause)
- Thalassemia
- Chronic disease
What to do about an abnormal result
- MCH is read alongside MCV and MCHC to determine what type of anemia may be present.
- A low MCH usually prompts iron and ferritin testing; a high MCH prompts B12 and folate testing.
- Mildly abnormal values without symptoms are often monitored.
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Frequently asked questions
What does high MCH mean?
A high MCH means your red blood cells carry more hemoglobin than average, usually because the cells are larger than normal. The most common causes are vitamin B12 and folate deficiencies, though liver disease and alcohol use can also raise it. It's checked alongside MCV.
Is low MCH always iron deficiency?
No. While iron-deficiency anemia is the most common cause of a low MCH, thalassemia and chronic disease can also lower it. Iron studies and, when needed, hemoglobin testing help distinguish between them.
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Medically reviewed by Antonieta Rueda, MD and Ayham Shneker, MD · Last reviewed July 6, 2026
This article is for informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or your lab results.