Screening for Toxoplasma gondii, rubella virus, cytomegalovirus and herpes simplex virus (TORCH) in the first trimester of pregnancy. 2. Cervicovaginal discharge test (routine vaginal discharge, gonococcus, Chlamydia trachomatis). 3. Thyroid function test. 4. Thalassemia screening (Guangdong, Guangxi, Hainan, Hunan, Hubei, Sichuan, Chongqing, etc.). 5. 75g oral glucose tolerance test (OGTT; for high-risk pregnant women). 6. Blood lipid examination. 7. Gynecologic ultrasound. 8. Electrocardiogram examination. 9. Chest x-ray.