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Serum Folate (Folate Blood Level)

Published: August 9, 2026Updated: August 17, 2026

This test measures the amount of folate, a form of vitamin B9, in your blood. Folate helps your body make healthy red blood cells and DNA.

Quick summary

["Check your folate levels to ensure proper vitamin B9 intake and support red blood cell health."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
14903-9
Short code
Folate Bld-Imp
Synonyms
Folate Bld-Imp
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Ref low
2.7
Ref high
17
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 Is This Test Done?

Your healthcare provider may order this test if you have symptoms like fatigue, weakness, or unusual bleeding. It’s also used to monitor folate levels in people with certain medical conditions, such as alcoholism or malabsorption disorders.

What to Expect Before the Test

No special preparation is needed. You may have a small needle inserted into your arm to draw blood. If you’re on blood thinners, let your provider know before the test.

What the Results Mean

Low folate levels may indicate poor diet, certain medications, or health conditions affecting absorption. High levels might suggest liver disease or folate supplements. Your provider will discuss results with you.

Common Conditions Linked to Folate Levels

Low folate is often linked to anemia, neural tube defects in pregnancy, or conditions like Crohn’s disease or alcohol use. High levels can sometimes signal liver issues or over-supplementation.

Reference range

NCBI: Folate 2.7-17.0 ng/mLN/A

Specimen: whole-blood

Fasting for 8-12 hours preferred for some tests. Inform about supplements you are taking.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical significance: Folate is essential for cell growth and red blood cell production. Deficiencies can lead to anemia, neurological issues, or complications during pregnancy. Monitoring folate helps prevent serious health risks.

Short name

Folates (Serum)

Frequently asked questions

What causes low folate levels?
Diet low in leafy greens, fortified foods, or malabsorption issues (e.g., celiac disease) can lower folate. Certain medications (like anticonvulsants) or alcohol use may also contribute.
How can I naturally boost my folate?
Eat foods like spinach, lentils, beans, fortified cereals, and citrus fruits. If you’re deficient, your provider may recommend supplements under medical guidance.
Will folate test results change with supplements?
Yes, folate supplements can raise levels quickly. If you take them, let your provider know so they can adjust monitoring or timing of your test.
  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 17, 2026. · Read our editorial policy