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Fluorescent Immunoassay for Folic Acid in Serum

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

This test measures the level of folate, a B vitamin important for red blood cell production and DNA synthesis, in your blood.

Quick summary

["Your doctor may check folate levels to assess vitamin deficiencies or monitor conditions like anemia or pregnancy-related needs."]

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

Key facts at a glance

LOINC
54244-9
Short code
FLUV Spec
Synonyms
FLUV Spec
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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

Why This Test Is Done

Doctors order folate tests to diagnose or monitor conditions such as anemia (low red blood cells), pregnancy-related folate deficiency, or to check for vitamin deficiencies. It may also be used in research or specialized clinical settings.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for 8–12 hours before the draw if instructed by your provider. Bring any medications or supplements you’re taking.

What the Test Results Mean

Results help determine if your folate levels are within normal ranges. Low levels may indicate poor diet, malabsorption issues, or certain medical conditions.

Common Conditions Linked to Folate Testing

Low folate can cause megaloblastic anemia (large, immature red blood cells) or contribute to neurological issues. High levels may be seen in certain genetic disorders or overconsumption.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Folic Acid (Serum) FIA

Frequently asked questions

What causes my folate levels to be low?
Low folate can result from poor diet (low intake of leafy greens, fortified foods), alcohol use, certain medications (like anticonvulsants), or conditions like Crohn’s disease or celiac disease.
How long does it take to get my results?
Results are typically available within 1–3 business days, depending on your lab’s processing time. Follow up with your doctor if you have questions about your results.
Can I take folate supplements if my levels are low?
Your doctor will advise on supplements or diet changes based on your test results. Avoid high-dose supplements without medical guidance, as they may mask underlying deficiencies in other vitamins.
  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