Skip to content

Serum/plasma substance concentration (immunoassay) for N-methylnicotinamide

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

This test measures the amount of N-methylnicotinamide, a breakdown product of niacin (vitamin B3), in your blood. It helps assess how efficiently your body processes niacin.

Quick summary

["This test may be used to monitor niacin metabolism or support research into vitamin B3 metabolism."]

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

Key facts at a glance

LOINC
30098-8
Short code
N men sg Y Ag Spec Ql LA
Synonyms
N men sg Y Ag Spec Ql LA
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
la
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What Does This Test Measure?

N-methylnicotinamide (NMN) is formed when niacin (vitamin B3) is metabolized in your liver. This test detects the concentration of NMN in your serum or plasma. While NMN itself isn’t directly linked to health outcomes, it reflects how your body processes niacin.

Why Might You Need This Test?

Your healthcare provider may order this test if you’re taking niacin supplements, have liver-related conditions, or if research suggests monitoring niacin metabolism is important for your care.

How Is the Test Performed?

A blood sample is drawn from a vein in your arm. The sample is sent to a lab where it’s analyzed using an immunoassay method to measure NMN levels.

What Do Results Mean?

Results are typically reported as a concentration (e.g., micromoles per liter). Interpretation depends on clinical context, such as whether you’re taking niacin or have a known condition. Your doctor will discuss findings with you.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

While NMN itself isn’t a standard clinical marker, elevated levels may indicate increased niacin metabolism or liver processing. Low levels could suggest impaired niacin breakdown, though this is rare. This test is not routinely used for general health monitoring but may be part of specialized studies or research.

Short name

N-Methylnicotinamide (NMN) Level

Frequently asked questions

What causes variations in NMN levels?
NMN levels can fluctuate based on niacin intake (from supplements or diet), liver function, and individual metabolism. Factors like diet, medications, or liver conditions may also influence results.
How long does it take to get results?
Results are usually available within 1–3 business days, depending on lab processing times. Your doctor will contact you once results are ready.
Can I influence NMN levels?
Yes—dietary niacin intake (e.g., from foods like chicken, fish, or fortified cereals) and niacin supplements can affect NMN levels. Avoiding alcohol and discussing medications with your doctor can also help ensure accurate results.
  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