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Folic acid, also known as vitamin B9, is a water-soluble B-vitamin that plays a fundamental role in many essential bodily functions. Folic acid is crucial for DNA synthesis, cell division, and the production of red blood cells. Folic acid is especially vital during periods of rapid growth and development, such as pregnancy. Adequate intake of folic acid is essential for maintaining overall health and preventing certain birth defects. This home blood test checks the level of folic acid in your blood.