BloodTestEasy

MCH 18.8 pg

Very low

Consider discussing this with your doctor in the coming weeks.

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Your band
Very low · 15–22 pg
Distance from typical range
8.2 pg below 27.0

What 18.8 pg means

An MCH of 18.8 pg is well below the normal range and means your red blood cells are carrying far less hemoglobin than they should. This level usually goes along with a noticeable anemia and deserves a clinician's attention within days, not months.

At this level, your red cells are markedly hypochromic — pale and hemoglobin-poor — which is the classic pattern of longstanding iron deficiency or an inherited hemoglobin condition such as thalassemia. What matters most now is your hemoglobin on the same report: if it is also clearly low, your blood's oxygen-carrying capacity is genuinely reduced. An MCH this low almost never happens overnight; it usually reflects months of iron loss (often slow bleeding) or a lifelong trait. It is not, by itself, an emergency value, but the cause needs to be found.

Most US laboratories consider roughly 27 to 33 pg per cell normal for adults of any sex, following the convention used by MedlinePlus and major US health systems.

Common causes

  • Moderate to severe iron deficiency, most often from slow blood loss (heavy periods, stomach or intestinal bleeding)
  • Thalassemia or thalassemia trait (inherited, common in people with Mediterranean, Middle Eastern, African, or Southeast Asian ancestry)
  • Long-term poor iron intake or absorption (celiac disease, prior stomach/intestinal surgery, chronic antacid use)
  • Chronic inflammatory disease or kidney disease restricting iron use
  • Frequent blood donation without iron replacement
  • Lead exposure (uncommon but important to rule out)
  • Sideroblastic anemia (rare)

Symptoms that can go with it

  • Marked fatigue or weakness
  • Shortness of breath with mild activity
  • Pale skin, gums, or inner eyelids
  • Rapid or pounding heartbeat
  • Dizziness or headaches
  • Cold hands and feet
  • Brittle nails or hair loss
  • Cravings for ice, dirt, or starch (pica)

Sensible next steps

  1. Contact your clinician within the next few days to review this result together with your hemoglobin and MCV — don't wait for your next annual visit
  2. Expect follow-up tests such as ferritin and iron studies, and possibly hemoglobin electrophoresis if thalassemia is suspected
  3. Tell your clinician about any bleeding: heavy periods, black or bloody stools, frequent nosebleeds, or blood donation
  4. Do not start high-dose iron on your own — if the cause is thalassemia, extra iron can be harmful, and self-treating can hide a bleeding source
  5. Seek urgent care right away if you have chest pain, severe shortness of breath, fainting, or black/tarry stools

Frequently asked questions

Is 18.8 pg a normal MCH level?

No — 18.8 pg is well below the typical 27–33 pg range. Red cells this hemoglobin-poor usually mean significant iron deficiency or an inherited condition like thalassemia, and the result deserves a clinician's attention within days.

What does a low MCH mean?

At 18.8 pg, the low MCH is pronounced — this degree of hemoglobin-poor red cells typically reflects longstanding iron deficiency (often from slow blood loss) or thalassemia. Finding the cause matters as much as treating the number, so see your clinician soon rather than self-treating with iron.

What does a high MCH mean?

A high MCH means your red blood cells are larger than normal, so each one carries more hemoglobin. The usual suspects are vitamin B12 or folate deficiency, regular alcohol use, liver disease, an underactive thyroid, and certain medications. It does not mean you have too much blood or too much iron.

What is the difference between MCH and MCHC?

MCH is the average amount of hemoglobin in each red blood cell (measured in picograms). MCHC is the average concentration of hemoglobin — how densely packed it is relative to the cell's size (measured in g/dL). A large cell can have a high MCH but a normal MCHC, because the extra hemoglobin is spread through a bigger cell. Labs report both because together with MCV they help pinpoint the type of anemia.

Can my MCH be abnormal even if my hemoglobin is normal?

Yes, and it's common. MCH describes the average hemoglobin per cell, not your total. Early iron deficiency and thalassemia trait can both lower MCH while total hemoglobin is still normal, and mild B12 shortfall or alcohol use can raise it the same way. An abnormal MCH with normal hemoglobin is often an early clue worth a routine check rather than a sign of established anemia.

How do I fix an abnormal MCH of 18.8 pg?

Don't reach for iron pills first — get tested first. If 18.8 pg is from iron deficiency, your clinician will treat the iron AND look for where it's being lost (often the gut or heavy periods). If it's thalassemia, iron supplements can actually be harmful.

Check a different MCH value

Related values on your lab report

Sources

Educational information, not medical advice. Reference ranges vary between labs — always compare with the range printed on your own report and discuss results with your doctor. Full disclaimer