A folic acid test measures the amount of
folic acid in the blood.
The normal values listed here—called a reference range—are just a guide. These ranges vary from lab to lab, and your lab may have a different range for what's normal. Your lab report should contain the range your lab uses. Also, your doctor will evaluate your results based on your health and other factors. This means that a value that falls outside the normal values listed here may still be normal for you or your lab.
High levels of folic acid in the blood may
mean that you eat a diet rich in folic acid, take vitamins, or take folic acid
pills. Consuming more folic acid than the body needs does not cause
High folic acid levels can also mean a vitamin B12
deficiency. Body cells need vitamin B12 to use folic acid. So if vitamin B12
levels are very low, folic acid can't be used by the cells, and high levels of
it may build up in the blood. But a folic acid test is not a reliable way to
test for a vitamin B12 deficiency.