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Hemoglobin Nitrogen-Adjusted Mean Corpuscular Volume (N-AMCV)

Published: August 9, 2026Updated: August 16, 2026

This test measures your red blood cells’ size after adjusting for nitrogen content, helping assess potential iron or vitamin deficiencies.

Quick summary

["N-AMCV helps diagnose anemia by checking red blood cell health beyond basic size alone."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
55374-3
Short code
Hgb N+I MFr Bld
Synonyms
Hgb N+I MFr Bld
Category
hematology
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Ref low
12
Ref high
17.5
Critical range
7 N/A – 20 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
85018
SNOMED
900000000000003004
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Matters

Standard MCV (Mean Corpuscular Volume) measures red blood cell size, but nitrogen levels can affect this measurement. N-AMCV corrects for this to give a more accurate picture of your blood’s iron and vitamin B12 status.

When You Might Need It

Your doctor may order an N-AMCV if you have symptoms like fatigue, pale skin, or shortness of breath, especially if other blood tests (like iron studies) show irregular results.

Common Causes of Abnormal Results

Low N-AMCV could indicate iron deficiency or vitamin B12 deficiency, while high values might suggest conditions like folate deficiency or certain blood disorders.

How the Test Works

Blood is drawn and analyzed to measure nitrogen-adjusted red blood cell size. This process involves precise chemical and computational adjustments to ensure accuracy.

Reference range

Adult males: 13.5-17.5 g/dL; Females: 12.0-16.0 g/dLN/A

Specimen: whole-blood

No special preparation usually required. Stay well hydrated. Inform your healthcare provider of all medications and supplements you are taking.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: N-AMCV’s Role in Diagnosing Anemia

Short name

N-AMCV

Frequently asked questions

What does an abnormal N-AMCV result mean?
An abnormal result may signal underlying conditions like anemia due to iron or vitamin deficiencies, but further testing (like ferritin or B12 levels) is needed to confirm the cause.
How often should I get this test?
Your doctor will determine frequency based on your symptoms, lab history, and overall health. Regular checks may be recommended if you have chronic conditions like anemia.
Can diet affect N-AMCV results?
Yes, diets low in iron, vitamin B12, or folate can influence red blood cell health, potentially altering N-AMCV values. Your doctor may suggest dietary changes or supplements if needed.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy