Folate Test
A blood test that measures folate (vitamin B9).
Quick Summary
To find the cause of anaemia, often with B12.
Serum or red cell folate.
Fasting may be advised.
Overview
Folate is important before and in early pregnancy.
Low folate causes large red blood cells.
What It Measures
Folate
Blood level.
How It's Performed
- 01
Preparation
Usually no special preparation unless your doctor advises.
- 02
Blood sample
A small amount of blood is taken from a vein in your arm.
- 03
Afterwards
Press on the spot; a small bruise is common.
Reference Ranges
Note: Normal ranges vary by laboratory. Consult your report for the specific reference used.
| Parameter | Typical Range (Adult) | Units |
|---|---|---|
| Serum folate | Above 4 | ng/mL |
Interpreting Results & Next Steps
Discuss with Doctor
Normal ranges differ between laboratories; use the range on your report. Your doctor will explain what your result means and what happens next.
If values are Low:
Low folate can cause anaemia.
Sources and further reading
Last updated 21 October 2026. For more detail, see these trusted health organisations.
- Vitamin B Test(opens in a new tab) · MedlinePlus, US National Library of Medicine