Folate (Folic Acid)
Also known as: Folic acid test, Vitamin B9 test, folic acid test, folate kam hona
Measures folate (vitamin B9) in the blood. Folate is needed to make healthy red blood cells and for a baby's spine and brain to develop normally in early pregnancy.
Why it's ordered
Investigating anaemia with large red cells (high MCV), poor diet, gut problems, heavy alcohol use, and some medicines that lower folate.
Preparation
Usually no fasting needed, but a recent meal can raise serum folate, so some labs prefer a fasting sample. Tell the lab if you take folic acid tablets.
Typical adult values
| Serum folate | above about 3–4 ng/mL (7 nmol/L); below this suggests deficiency |
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Ranges vary between labs and methods. Always use the range printed on your report.
If it's high
A high folate is usually from folic acid tablets or fortified food and is not harmful by itself.
If it's low
Low folate can cause anaemia with large red cells, tiredness and mouth ulcers. Common causes are poor diet, pregnancy, alcohol and gut conditions.
Good to know
Vitamin B12 should be checked at the same time: treating with folic acid alone when B12 is also low can hide the anaemia while B12-related nerve damage continues. Women planning pregnancy are advised to take folic acid before conception and in early pregnancy; ask your doctor about the right dose.
Common questions
What is a normal folate level?
Serum folate above about 3–4 ng/mL (7 nmol/L) is usually normal; below this suggests deficiency. Always use the range printed on your report.
Should vitamin B12 be checked with folate?
Yes. Treating with folic acid alone when B12 is also low can hide the anaemia while B12-related nerve damage continues.
Is high folate harmful?
A high folate is usually from folic acid tablets or fortified food and is not harmful by itself.
Why is folic acid important before pregnancy?
Folate helps a baby's spine and brain develop normally in early pregnancy. Ask your doctor about the right dose.