Is abnormal MCHC on a blood test a sign of cancer or a serious disease?

What is MCHC in a blood test?

MCHC stands for Mean Corpuscular Hemoglobin Concentration. It’s a measure of how much hemoglobin your red blood cells carry, expressed as grams per deciliter (g/dL). Hemoglobin is the protein that transports oxygen from your lungs to the rest of your body. By looking at MCHC, doctors can get clues about the type of anemia you might have or other red blood cell disorders.

• Normal MCHC range: ~33–36 g/dL
• Low MCHC: red cells have less hemoglobin than normal (hypochromia)
• High MCHC: red cells appear overly concentrated with hemoglobin (hyperchromia)

Common causes of low MCHC (hypochromia)

When MCHC falls below the normal range, red blood cells look paler under the microscope. This finding often points to:

• Iron-deficiency anemia
– Most common cause of anemia worldwide
– May result from blood loss (menstruation, ulcers), poor diet, or absorption issues

• Thalassemia trait
– Genetic disorder affecting hemoglobin production
– Often mild, may run in families

• Chronic disease anemia
– Long-term conditions (e.g., rheumatoid arthritis, chronic infections) can affect iron use

• Lead poisoning
– Rare in adults but still seen in some occupations or environmental exposures

Common causes of high MCHC (hyperchromia)

A raised MCHC is less frequent than a low reading. Possible reasons include:

• Hereditary spherocytosis
– Genetic condition where red cells are misshapen (spherocytes) and lose flexibility
– Can cause mild to moderate hemolytic anemia

• Autoimmune hemolytic anemia
– Body’s immune system attacks its own red blood cells
– Cells may lose water and shrink, concentrating hemoglobin

• Laboratory artifact
– Lipemia (high blood fats) or cold agglutinins can falsely elevate MCHC
– Repeat testing or special handling may be needed

Is an abnormal MCHC a sign of cancer or serious disease?

An isolated abnormal MCHC rarely points directly to cancer. Instead, it helps classify the type of anemia or red cell disorder. However, certain blood cancers (like some leukemias) and bone marrow diseases can cause or worsen anemia, altering MCHC in the broader context of other tests.

Key considerations:

• Look at the whole CBC
– Hemoglobin, hematocrit, MCV (average cell size), RDW (size variation) and platelet count
– A pattern of abnormalities may raise concern for bone marrow involvement

• Check additional tests
– Iron studies (ferritin, TIBC), vitamin B12/folate levels
– Reticulocyte count (young red cells) to gauge bone marrow response

• Review symptoms and risk factors
– Fatigue, weight loss, night sweats or persistent fevers can signal more serious issues
– Personal/family history of blood disorders or cancer

On its own, a mildly low or high MCHC usually reflects a common form of anemia. It’s uncommon for a slight MCHC change—without other abnormalities—to be the first clue to cancer or another life-threatening disease.

When to seek further evaluation

Consider talking to your doctor if you have:

• Persistent fatigue, weakness or shortness of breath
• Unexplained bruising or bleeding
• Significant weight loss or night sweats
• A family history of blood disorders or cancer
• Repeated abnormal CBC tests

Your healthcare provider may recommend:

• Detailed iron studies, vitamin levels, or hemoglobin electrophoresis
• A repeated CBC to rule out lab error
• Referral to a hematologist for specialized testing

Next steps you can take today

If you’re concerned about your test results or new symptoms, starting with some self-guided information can help you prepare for your doctor’s visit.

Consider a free, online symptom check, using the doctor approved Ubie Symptom Checker to explore possible causes and get guidance on when to seek care.

Speak to a doctor

Abnormal blood test results can be unsettling, but they serve as clues pointing toward the right diagnosis. If your MCHC or any other lab value is outside the normal range, it’s important to:

1. Discuss results with your primary care physician or a hematologist
2. Follow up promptly on recommended tests or referrals
3. Report any new or worsening symptoms immediately

Only a qualified healthcare professional can interpret your full clinical picture and recommend appropriate treatment. If you’re ever in doubt—especially if symptoms could be life-threatening—seek medical attention right away.