Iron deficiency anemia during pregnancy, which may lead to adverse pregnancy outcomes, was a serious health problem in China. Various iron supplements used in different regions of China, however, the effects have not been well investigated. The objective of this study is to investigate the diagnosis, treatment and prognosis of iron deficiency and iron deficiency anemia in Chinese pregnant women.

This is a nationwide multicenter prospective cohort study conducted in seven hospitals in China to investigate the diagnosis, treatment and prognosis of iron deficiency and iron deficiency anemia in Chinese pregnant women. This study will enroll about 6000-7000 pregnant women, who established a health record in the seven hospitals. Demographic characteristics, laboratory tests, behavior habits during pregnancy, mental status, and pregnancy outcomes will been collected. All information will collect by a pregnant women self-reported questionnaire and the electronic medical record system in hospitals at three timing points: 6-15 gestational weeks, 30-34 gestational weeks and one week after delivery.

Inclusion Criteria:

• Pregnant women who registered an antenatal care file at the survey hospital ;
• Signed informed consent.

Exclusion Criteria:

• Participated in any drug or nutritional clinical trial from 3 months before pregnancy to recruitment.

Chinese pregnant women who established a health record at one of the survey hospital in seven cities of China.

Data can be shared with other researchers with the agreement of the Coordinating Committee and the Ethics Committee.