Match each clinical presentation during routine prenatal care with its most appropriate next step in management based on standard obstetric protocols.
- At 28 weeks gestation, a 27-year-old O-negative patient (second pregnancy, one prior delivery) presents with an anti-D antibody titer of 1:32.Withhold anti-D immune globulin and initiate serial monitoring of fetal middle cerebral artery peak systolic velocity.
- An asymptomatic Group B Streptococcus bacteriuria was treated at 12 weeks gestation in a 25-year-old primigravida, who is now presenting for her 36-week evaluation.Forego third-trimester rectovaginal swab screening and plan for intrapartum antibiotic prophylaxis.
- During a 16-week prenatal visit, a 31-year-old patient (G3P2) is noted to have a maternal serum alpha-fetoprotein result of 3.2 multiples of the median.Perform a targeted fetal anatomy ultrasound to evaluate for neural tube and abdominal wall defects.
- Following a 50-g glucose challenge test at 26 weeks gestation, a 32-year-old nulliparous patient receives a plasma glucose result of 158 mg/dL.Proceed to a 3-hour 100-g oral glucose tolerance test for definitive diagnosis.
- Ultrasound assessment at 11 weeks for a 29-year-old pregnant patient reveals a notably enlarged fetal nuchal translucency of 3.8 mm.Offer diagnostic genetic testing via chorionic villus sampling or amniocentesis.
Answer
The correct matches align each specific screening abnormality with its next indicated step: Rh sensitization requires monitoring fetal MCA Doppler rather than administering RhoGAM; GBS bacteriuria mandates intrapartum prophylaxis without late screening; elevated MSAFP requires a targeted anatomy ultrasound; a positive 1-hour glucose screen requires a 3-hour glucose tolerance test; and an enlarged nuchal translucency warrants offering invasive diagnostic genetic testing.
Each correct pair directly reflects evidence-based guidelines for prenatal care, successfully matching a specific maternal or fetal screening result with the standardized next clinical step to confirm a diagnosis, monitor for complications, or provide prophylaxis.
Step-by-Step Solution
Key Concept
Standard obstetric protocols dictate specific next steps for abnormal routine prenatal screening tests across all trimesters, focusing on distinguishing between when further screening versus definitive diagnosis or intervention is required.