Objective To understand folic acid status and its seasonal trend among progestational and pregnant women, so as to provide evidence for further folic acid intervention. Methods A total of 2040 women were recruited when they received pre-marital medical examination in three counties(Feidong, fertilizer West, Changfeng) in Hefei Province, of which 731 pregnant women, 1309non-pregnant women. We collected blood samples and basic demographic information of those samples. Results The average level of folic acid f...