MCV 110 fL
Consider discussing this with your doctor in the coming weeks.
- Markedly low (severe microcytosis)
- Low (microcytosis)
- Borderline low
- Normal
- Borderline high (mild macrocytosis)
- High (macrocytosis)
- Markedly high (severe macrocytosis)
At a glance
- Your band
- High (macrocytosis) · 105–115 fL
- Distance from typical range
- 10 fL above 100
What 110 fL means
An MCV of 110 fL is clearly above the typical 80–100 fL range — your red blood cells are larger than normal.
At this level a specific cause is found more often than not. Vitamin B12 or folate deficiency, heavy alcohol use, liver disease, hypothyroidism, and medication effects lead the list. B12 deficiency deserves particular attention because, left untreated, it can injure nerves — and that damage does not always fully reverse. Bone-marrow conditions such as myelodysplastic syndrome are a less common possibility, mostly in older adults, and are considered when nothing else explains the result.
Most US labs consider roughly 80 to 100 fL a normal adult MCV for both men and women, following the convention used by StatPearls and most US laboratories; exact cutoffs vary slightly by laboratory.
Common causes
- Vitamin B12 deficiency (pernicious anemia, poor absorption after stomach surgery, long-term metformin or acid-reducer use, vegan diet without supplements)
- Folate deficiency
- Heavy alcohol use
- Liver disease
- Underactive thyroid (hypothyroidism)
- Medications such as hydroxyurea, zidovudine, methotrexate, or anticonvulsants
- Marked reticulocytosis (young red cells) after bleeding or hemolysis
- Myelodysplastic syndrome, mainly in adults over 65
Symptoms that can go with it
- Fatigue or weakness
- Pale skin
- Numbness or tingling in the hands or feet (a B12 warning sign)
- Balance problems or unsteady walking
- A sore, smooth, or red tongue
- Memory or mood changes
- Shortness of breath with activity
Sensible next steps
- Arrange an appointment in the coming weeks — sooner if you have numbness, tingling, or balance problems, which can signal B12-related nerve involvement
- Expect testing for B12, folate, thyroid (TSH), and liver function; a blood smear may be added
- Tell your clinician honestly about alcohol use — it is a leading cause and improves after cutting back
- Bring a complete list of medications and supplements
- Do not start high-dose B12 before testing; supplementing first can hide the diagnosis, so discuss timing with your clinician
Frequently asked questions
Is 110 fL a normal MCV level?
No — 110 fL is above the typical 80–100 fL range, which means your red cells are larger than average. B12 or folate deficiency, alcohol, thyroid or liver issues, and medications are the usual explanations.
What does a low MCV mean?
A low MCV (microcytosis) means your red blood cells are smaller than normal. The two most common causes are iron deficiency — often from blood loss — and thalassemia trait, an inherited condition that is usually harmless but runs in families. Iron studies (especially ferritin) usually separate the two. Because red cells live about 120 days, a low MCV reflects something that has been going on for a while.
What does a high MCV mean?
A high MCV (macrocytosis) means your red blood cells are larger than normal. Common causes include vitamin B12 or folate deficiency, regular alcohol use, liver disease, an underactive thyroid, and several medications. Mild elevations are often benign, but a persistently or clearly high MCV deserves a workup — mainly to rule out B12 deficiency, which can affect nerves if untreated.
Can my MCV be abnormal even if I'm not anemic?
Yes. MCV describes red cell size, not red cell quantity, so it can drift out of range while your hemoglobin is still normal. A low MCV without anemia is common in thalassemia trait and early iron deficiency; a high MCV without anemia often comes from alcohol, medications, or early B12/folate shortfall. An abnormal MCV with normal hemoglobin is often an early clue worth a simple follow-up rather than a cause for alarm.
Does drinking alcohol raise MCV?
Yes — regular alcohol use is one of the most common causes of a mildly elevated MCV, even without anemia and even before the liver shows any trouble. The effect comes both from alcohol's direct action on the bone marrow and from the folate deficiency that can accompany heavy drinking. The MCV typically drifts back toward normal over two to four months after cutting back, since that is how long it takes to replace the red cell population.
Should I worry about an MCV of 110 fL?
It deserves a proper look. 110 fL usually has a findable cause — B12 or folate deficiency, alcohol, thyroid, liver, or a medication. See your clinician in the coming weeks, sooner if you notice numbness, tingling, or balance changes.
Check a different MCV value
Sources
- MCV (Mean Corpuscular Volume) — MedlinePlus, National Library of Medicine
- Red Blood Cell (RBC) Indices — MedlinePlus, National Library of Medicine
- Mean Corpuscular Volume (StatPearls) — NCBI Bookshelf, National Library of Medicine
- Complete blood count (CBC) — Mayo Clinic
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