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Difficulty: EasyNormal Pregnancy and Prenatal Care

Match each gestational age timeframe with the most appropriate routine prenatal screening test or intervention indicated at that time for an uncomplicated pregnancy.

  • 15 to 22 weeks of gestationMaternal serum quadruple screen
  • 24 to 28 weeks of gestation50-g oral glucose challenge test
  • 28 weeks of gestationProphylactic anti-D immune globulin administration (if Rh-negative)
  • 36 to 37 weeks of gestationRectovaginal culture for Group B Streptococcus

Answer

15 to 22 weeks matches with Maternal serum quadruple screen; 24 to 28 weeks matches with 50-g oral glucose challenge test; 28 weeks matches with Prophylactic anti-D immune globulin; 36 to 37 weeks matches with Rectovaginal culture for Group B Streptococcus.
Routine prenatal care follows a strict, evidence-based chronological schedule designed to maximize maternal and fetal safety. The quadruple screen is performed in the early second trimester (15-22 weeks). Gestational diabetes screening occurs at the end of the second trimester (24-28 weeks) due to peaking diabetogenic placental hormones. Anti-D immune globulin is given at 28 weeks to prevent third-trimester alloimmunization. Finally, GBS screening is conducted in the late third trimester (36-37 weeks) to guide intrapartum antibiotic prophylaxis effectively.

Step-by-Step Solution

1
Determine the correct gestational window for second-trimester aneuploidy screening.
The quadruple marker screen is optimally performed between 15 and 22 weeks.
Biochemical markers in maternal serum during this window provide the highest sensitivity for detecting Down syndrome, Edwards syndrome, and open neural tube defects.
2
Identify the standard timeframe for universal gestational diabetes mellitus (GDM) screening.
GDM screening via a 50-g oral glucose challenge test is done at 24 to 28 weeks.
Placental secretion of human placental lactogen and other diabetogenic hormones peaks in the late second and early third trimesters, making this the optimal time to detect insulin resistance.
3
Recall the timing for routine alloimmunization prophylaxis in Rh-negative patients.
Anti-D immune globulin is administered at 28 weeks of gestation.
Administering prophylaxis at 28 weeks provides adequate circulating antibodies to protect against fetal-maternal hemorrhage during the highest-risk period of the third trimester.
4
Identify the recommended timing for universal Group B Streptococcus (GBS) screening.
GBS rectovaginal screening is performed at 36 to 37 weeks.
Swabbing within 5 weeks of expected delivery ensures the culture results accurately reflect the patient's colonization status at the time of labor.

Key Concept

Chronology of Routine Prenatal Screening and Interventions
Estimated Time:1m 0s
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Topics

Normal Pregnancy and Prenatal Care

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