To find out if your body is deficient in folic acid, you can have your folic acid concentration checked by having blood drawn. A blood test for folic acid is done by drawing blood from a vein to check the concentration of folic acid in the blood serum. Normal deficiency of folic acid will show changes in the shape and size of red blood cells, and may be accompanied by neutropenia and thrombocytopenia, and in severe cases, the enlarged portion of the neutrophils will have a rightward shift of the nucleus. It should be noted that when the body lacks folic acid may appear anemia, megaloblastic anemia, stomatitis, seborrheic dermatitis-like lesions or leukopenia and other symptoms. You can take folic acid tablets to supplement folic acid in time, and you can also supplement folic acid by eating foods such as pork liver, eggs, fish, cabbage, spinach and celery. If the folic acid deficiency is found to be serious, it is recommended that standardized treatment be carried out as soon as possible to reduce the adverse effects of the disease on the human body.