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Difficulty: MediumPreventive Care and Screening

A 28-year-old nulliparous woman at 28 weeks gestation presents to the obstetric clinic for a routine prenatal evaluation. Her pregnancy has been entirely uncomplicated to date, and she reports normal fetal movement. Her vital signs are within normal limits. She had a normal 1-hour 50-g oral glucose challenge test at her 26-week visit. Laboratory testing from her first trimester showed she is blood type A positive, non-immune to rubella, non-immune to varicella, and negative for HIV, syphilis, and hepatitis B and C. She received an inactivated influenza vaccine at 12 weeks gestation. She has no significant past medical history and takes a daily prenatal vitamin. Which of the following is the most appropriate next step in preventive care for this patient today?

  1. A
    Administer the measles, mumps, and rubella (MMR) vaccine
  2. B
    Administer Rh(D) immune globulin
  3. Administer the tetanus toxoid, reduced diphtheria toxoid, and acellular pertussis (Tdap) vaccineAnswer
  4. D
    Obtain a rectovaginal swab for group B streptococcus culture
  5. E
    Administer the 20-valent pneumococcal conjugate vaccine (PCV20)

Answer

The most appropriate next step is to administer the tetanus toxoid, reduced diphtheria toxoid, and acellular pertussis (Tdap) vaccine.
The correct answer is to administer the tetanus toxoid, reduced diphtheria toxoid, and acellular pertussis (Tdap) vaccine. The Advisory Committee on Immunization Practices (ACIP) and the American College of Obstetricians and Gynecologists (ACOG) recommend administering the Tdap vaccine during every pregnancy, regardless of the patient's prior vaccination history. The optimal timing for administration is between 27 and 36 weeks of gestation. This specific timing window maximizes the maternal antibody response and facilitates the passive transfer of protective IgG antibodies across the placenta. This passive immunity is crucial because it protects the infant from pertussis (whooping cough) during the vulnerable first few months of life, before the infant is old enough to receive their own primary vaccination series. Since this healthy patient is currently at 28 weeks gestation, it is the ideal time to administer the Tdap vaccine.

Step-by-Step Solution

1
Evaluate the patient's current gestational age and prior screening history.
The patient is at 28 weeks gestation, is Rh(D) positive, has already completed gestational diabetes screening, and is non-immune to rubella and varicella.
Establishing the patient's baseline is necessary to determine which prenatal preventive interventions are indicated at the current visit.
2
Apply evidence-based prenatal preventive care guidelines for the early third trimester.
Routine care optimally between 27 and 36 weeks of gestation includes the administration of the Tdap vaccine.
Guidelines mandate Tdap administration in every pregnancy to maximize the passive transfer of protective pertussis antibodies to the fetus.
3
Rule out alternative interventions by assessing absolute contraindications and indication criteria.
The MMR vaccine is contraindicated due to pregnancy, Rh(D) immune globulin is not indicated due to Rh-positive status, and group B streptococcus screening is premature.
This confirms that Tdap vaccination is the only correct and safe preventive intervention among the choices provided.

Key Concept

The tetanus toxoid, reduced diphtheria toxoid, and acellular pertussis (Tdap) vaccine is recommended for all pregnant women during every pregnancy, optimally between 27 and 36 weeks of gestation, regardless of prior vaccination history.
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Topics

Preventive Care and Screening

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