Folic Acid Test Folic acid is a type of B vitamin that plays an important role in the formation of red blood cells and the production of DNA. It is often taken as a supplement during pregnancy to prevent certain birth defects in the baby’s brain and spine. Pre-test preparation for a folic acid test typically involves fasting for 8-12 hours before the blood sample is taken. The testing method for folic acid levels typically involves a blood test. The blood sample is analyzed in a lab to measure the amount of folic acid present. Common symptoms that may prompt a healthcare provider to prescribe a folic acid test include fatigue, weakness, or a lack of appetite. Other symptoms may include gray hair, mouth sores, or a swollen tongue. A folic acid deficiency can be diagnosed by a healthcare provider based on the results of the blood test, as well as a patient’s symptoms and medical history. The reference range for folic acid levels in the blood is typically between 2-20 ng/mL. However, it’s important to note that this can vary based on the lab and the specific test used. A normal value for folic acid is considered to be between 4-20 ng/mL. However, it’s important to note that optimal levels may be higher for certain individuals, such as pregnant women.It’s also important to consult with a healthcare professional to interpret test results and to understand how they may be affected by individual factors such as diet, medications, medical history and other lab test results.