What it means
The serum folate is checked with the vitamin B12 levelVY-tuh-min bee-TWELV LEV-ulA blood test that measures vitamin B12 (cobalamin), needed to make red blood cells and keep nerves healthy.Full entry when a client has large red blood cells (macrocytic anemia). Low folate comes from a poor diet, heavy alcohol use, malabsorption, pregnancy and some drugs such as methotrexate and phenytoin. A recent meal can raise the serum level, so a red cell folate is sometimes used to show longer-term status.
For the nurse
The lab may ask for a fasting sample. Teach clients who could become pregnant about folic acid supplements, which lower the risk of neural tube defects.
At a glance
| Normal range | Above about 4 ng/mL [9 nmol/L]; 2–4 ng/mL is borderline and below 2 ng/mL deficient. Ranges vary by lab. |
|---|---|
| Also written | folic acid level, serum folate |
Related terms
anemia
A lower than normal number of red blood cells or amount of hemoglobin in the blood.
folic acid
A B vitamin (vitamin B9) that the body needs to make DNA and red blood cells.
folate
A B vitamin (vitamin B9) the body needs to make DNA and new cells, including red blood cells.
vitamin B12 level
A blood test that measures vitamin B12 (cobalamin), needed to make red blood cells and keep nerves healthy.