Definition

Folic acid is a type of B vitamin. This article discusses the test to measure the amount of folic acid in the blood.

Alternative Names

Folate – test

How the Test is Performed

A blood sample is needed.

How to Prepare for the Test

You should not eat or drink for 6 hours before the test. Your health care provider may tell you to stop taking any drugs that may interfere with test results, including folic acid supplements.

Drugs that can decrease folic acid measurements include:

• Alcohol
• Aminosalicylic acid
• Birth control pills
• Estrogens
• Tetracyclines
• Ampicillin
• Chloramphenicol
• Erythromycin
• Methotrexate
• Penicillin
• Aminopterin
• Phenobarbital
• Phenytoin
• Drugs to treat malaria

How the Test will Feel

You may feel slight pain or a little sting when the needle is inserted. There may be some throbbing at the site.

Why the Test is Performed

This test is done to check for folic acid deficiency.

Folic acid helps form red blood cells and produce DNA that stores genetic codes. Taking the right amount of folic acid before and during pregnancy helps prevent neural tube defects, such as spina bifida.

Women who are pregnant or planning to become pregnant should take at least 600 micrograms (mcg) of folic acid every day. Some women may need to take more if they have a history of neural tube defects in earlier pregnancies. Ask your provider how much you need.