Recommended routine and optional prenatal tests
| Gestational age | ||||
| First trimester | 8–20 weeks | 24–28 weeks | 32–36 weeks | |
| Routine tests | Blood type and antibody screen | None | Screening for gestational diabetes | Group B strep testing |
| Haemoglobin or haematocrit | Haemoglobin or haematocrit | |||
| Urinalysis | ||||
| Urine culture | ||||
| Rubella immunity | ||||
| Syphilis screen | ||||
| Chlamydia screen | ||||
| Hepatitis B surface antigen | ||||
| HIV testing | ||||
| Optional tests | Screening for trisomies 21, 18 | Ultrasound for fetal morphological assessment | ||
| Screening for cystic fibrosis | Screening for trisomies 21, 18 and spina bifida | |||
| Pap smear | ||||