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Difficulty: MediumNormal Pregnancy and Prenatal Care

Match each pregnant patient scenario with the most appropriate routine screening test or laboratory evaluation indicated at their current gestational age.

  • A 24-year-old primigravida at 9 weeks gestation presenting for her initial obstetric visitBlood type, Rh factor, HIV, RPR, Hepatitis B surface antigen, and immunity to rubella
  • A 29-year-old multigravida at 16 weeks gestation who desires neural tube defect and aneuploidy screeningMaternal serum alpha-fetoprotein, hCG, estriol, and inhibin A (quadruple screen)
  • A 31-year-old primigravida at 26 weeks gestation presenting for a routine second-trimester follow-upComplete blood count and 1-hour 50-g oral glucose challenge test
  • A 27-year-old primigravida at 36 weeks gestation presenting for a routine third-trimester visitRectovaginal culture for Group B Streptococcus

Answer

Match the 9-week initial visit to baseline infectious and hematologic screening; the 16-week visit to the quadruple screen; the 26-week visit to the glucose challenge test and CBC; and the 36-week visit to the Group B Streptococcus rectovaginal swab.
Each prenatal scenario represents a classic milestone in normal obstetrical care. The initial visit requires baseline serologies and blood typing. The second trimester (15-20 weeks) focuses on anatomical and genetic screening like the quadruple screen. The late second to early third trimester (24-28 weeks) requires screening for gestational diabetes and anemia. Finally, the late third trimester (36-37 weeks) focuses on preparation for delivery, specifically testing for Group B Streptococcus to guide intrapartum prophylaxis.

Step-by-Step Solution

1
Identify the gestational age for each patient presentation.
The patients are at 9, 16, 26, and 36 weeks gestation.
Routine prenatal screenings are evidence-based interventions tied to specific optimal gestational windows.
2
Evaluate the indication for the 9-week initial visit.
Matches with baseline labs (Blood type, Rh factor, HIV, RPR, etc.).
Establishing maternal baseline health and infectious status is required at the first prenatal encounter.
3
Evaluate the indication for the 16-week visit.
Matches with the quadruple screen.
This is the precise window (15-20 weeks) for second-trimester biochemical screening for aneuploidy and neural tube defects.
4
Evaluate the indication for the 26-week visit.
Matches with the 1-hour glucose challenge test and complete blood count.
Universal screening for gestational diabetes and re-evaluation for maternal anemia occurs between 24 and 28 weeks.
5
Evaluate the indication for the 36-week visit.
Matches with rectovaginal culture for Group B Streptococcus.
This culture must be collected within 5 weeks of expected delivery (typically 36-37 weeks) to accurately predict colonization status during labor.

Key Concept

Routine prenatal care requires adherence to a standardized timeline for maternal and fetal screening to optimize pregnancy outcomes.
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Topics

Normal Pregnancy and Prenatal Care

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