⚠ Educational only. LabPlain does not provide medical advice or diagnosis. Always discuss your specific results with your healthcare provider.
What this test measures
MCHC stands for Mean Corpuscular Hemoglobin Concentration. It measures the average concentration of hemoglobin inside a single red blood cell. Hemoglobin is the iron-rich protein that grabs oxygen from your lungs and carries it to the rest of your body.
Think of it as a measurement of color density. Hemoglobin gives red blood cells their bright crimson look. MCHC tells your doctor whether your red blood cells have the right amount of hemoglobin packed inside them (making them standard red), too little (making them pale), or too much (making them deeply red).
An MCHC test is never ordered by itself. It is a calculated component of a standard Complete Blood Count (CBC) panel, specifically grouped under "Red Blood Cell Indices" alongside tests like MCV and MCH to figure out the root cause of conditions like anemia.
Normal reference range
Adults: 32–36 g/dL (or 320–360 g/L)
A normal MCHC means your red blood cells contain a healthy percentage of oxygen-carrying protein, giving them their standard structural color (termed "normochromic").
Reference ranges can slightly fluctuate between different lab facilities. Always default to the specific reference range indicated directly on your physical lab report.
🧪 No Fasting Required
Because MCHC looks at the physical makeup of your existing red blood cells, eating, fasting, or the time of day does not alter your results. You can take this test at any hour, with or without food.
What your result might indicate
↑ If High
Elevated MCHC (hyperchromic) means cells are overly packed with hemoglobin. This is rare and usually indicates spherocytosis (a structural cell defect), severe dehydration, or certain types of autoimmune hemolytic anemia.
↓ If Low
Low MCHC (hypochromic) indicates pale, diluted cells lacking enough hemoglobin. This is most commonly caused by iron deficiency anemia, long-term chronic illnesses, or genetic blood disorders like thalassemia.
Symptoms associated with abnormal mchc
↑ High MCHC Symptoms
Jaundice (yellowish skin or eyes)
Enlarged spleen / abdominal pain
Fatigue and weakness
Shortness of breath during movement
Dizziness or lightheadedness
↓ Low MCHC Symptoms
Chronic fatigue and low stamina
Unusual paleness in skin or gums
Cold hands and feet
Brittle nails or hair loss
Rapid or skipping heartbeats
Headaches and brain fog
Common causes of abnormal mchc
What can raise MCHC?
True high MCHC is relatively rare. The most frequent causes are hereditary spherocytosis—a genetic condition causing red blood cells to become fragile, round spheres rather than flexible donut shapes—and autoimmune hemolytic anemia, where your immune system mistakenly attacks its own blood cells. Severe dehydration can also falsely compress plasma volume, causing a temporary artifactual spike on your blood panel.
Additionally, if a blood sample is accidentally handled poorly or undergoes "hemolysis" (cell breakage) inside the test tube before analysis, it can trigger a falsely high reading on the lab machines.
What can lower MCHC?
The runaway primary cause of low MCHC is iron deficiency anemia. Without enough iron, your body cannot manufacture the structural core of hemoglobin, resulting in pale, empty-looking cells. Another prominent cause is thalassemia, an inherited genetic condition that causes an imbalance in your hemoglobin chains.
Chronic inflammatory states, such as long-term infections, kidney disease, or autoimmune flare-ups, can also block your body from properly utilizing stored iron, driving down your MCHC concentration over time.
Tests often ordered alongside MCHC
An MCHC value is rarely reviewed on its own. Your healthcare provider will inspect it side-by-side with these key markers:
MCV (Mean Corpuscular Volume) — Measures the physical size of your red blood cells to determine if they are too small or too big.
MCH (Mean Corpuscular Hemoglobin) — Measures the absolute total weight of hemoglobin inside an average cell.
Ferritin & Iron Panels — Evaluates your body's backup iron reserves to rule out iron deficiencies.
Reticulocyte Count — Measures how fast your bone marrow is producing brand-new red blood cells.
Peripheral Blood Smear — A manual microscope examination where a pathologist physically looks at the shape and color of your blood cells.
What to do next
An out-of-range MCHC is essentially a structural clue pointing to a broader underlying health story, not an isolated diagnosis. Your body modifies blood production slowly based on nutrition, genetic history, and chronic stressors. Avoid stressing over a single high or low arrow. Bring your complete CBC panel to your doctor so they can cross-reference your MCHC alongside your MCV and iron levels.
Questions to ask your doctor
01Does my low or high MCHC point toward an iron issue, or is it likely a different form of anemia?
02How do my MCV and MCH numbers look when paired alongside this MCHC result?
03Do you recommend an iron, ferritin, or total iron-binding capacity (TIBC) test next?
04Could my results be an artifact of how the blood sample was collected or processed?
05Are there specific changes to my dietary intake or temporary supplements you'd recommend based on this?
Frequently asked questions
What is the difference between MCH and MCHC?
MCH measures the absolute weight of hemoglobin inside an average cell, whereas MCHC measures the relative concentration of hemoglobin relative to the total volume size of that cell. Think of MCH as the total mass of iron protein in a room, and MCHC as how packed or crowded that room actually feels.
Can dehydration cause high MCHC?
Yes. Severe dehydration causes the liquid portion of your blood (plasma) to drop, making the concentration of hemoglobin inside your remaining cells appear artificially higher on the lab analyzer. Replenishing fluids typically resolves this type of high variance.
Can a poor diet cause low MCHC?
Absolutely. A diet lacking in iron-rich foods (like red meat, leafy greens, or fortified cereals) restricts the basic building blocks your body needs to construct hemoglobin. Over time, this nutritional shortage forces your cells to look pale and empty, reducing your MCHC.