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Serum or plasma concentration of flavoprotein (e.g., flavin adenine dinucleotide, FAD) measured by immunoassay

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

This test measures the amount of flavoproteins, a class of compounds containing the vitamin-like molecule flavin, found in your blood. Flavoproteins play key roles in metabolism and energy production.

Quick summary

["Flavoproteins help your body convert food into energy and support cellular functions."]

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

Key facts at a glance

LOINC
46082-4
Short code
FLUAV Ag Nph Ql IA
Synonyms
FLUAV Ag Nph Ql IA
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
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 Flavoproteins Are and Their Role in Your Body

Flavoproteins are coenzymes involved in redox reactions, aiding in energy production and detoxification processes. They include molecules like flavin adenine dinucleotide (FAD) and flavin mononucleotide (FMN), which are essential for enzymes in metabolism. While less commonly tested than other blood markers, they contribute to overall cellular health and function.

How This Test Is Performed

This test involves drawing blood from a vein in your arm. The blood sample is then processed to separate serum or plasma, where flavoprotein levels are measured using an immunoassay. This method detects specific flavoprotein molecules with high sensitivity.

Why You Might Need This Test

Your healthcare provider may order this test if you have symptoms or conditions linked to metabolic or energy-related disorders, such as mitochondrial dysfunction, certain genetic disorders, or unexplained fatigue. It may also be part of broader metabolic screening.

What to Expect Before the Test

Prepare as you would for any blood test: avoid alcohol for 24 hours before the test, and fast if instructed. Wear comfortable clothing and bring any necessary identification. Hydration is generally encouraged, but check with your provider for specific instructions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Flavoprotein Level (Serum/Plasma)

Frequently asked questions

What does a low or high flavoprotein level mean?
Low levels of flavoproteins may indicate metabolic dysfunction, mitochondrial disorders, or deficiencies in vitamin B2 (riboflavin), which is a precursor to flavoproteins. High levels could suggest liver disease, certain infections, or overproduction of flavoproteins in metabolic pathways. However, flavoprotein levels are less commonly used for diagnosing specific conditions compared to other blood tests.
How often should I get this test?
This test is not routinely performed as part of standard health screenings. It is typically ordered based on clinical suspicion of metabolic disorders, genetic testing, or specific symptoms. Follow your healthcare provider’s recommendations for timing and frequency.
Can I eat or drink anything before this test?
Check with your healthcare provider for specific instructions, but generally, you may drink clear fluids (like water) unless fasting is required. Avoid alcohol and heavy meals before the test to 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