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OB Guideline 8: Antenatal Care

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Initial Visit

The initial visit to the obstetrical provider should be scheduled in the first trimester (whenever possible). The visit should include a detailed evaluation of the patient and her history to assess and plan for the pregnancy. At a minimum, the initial assessment should encompass:

  1. A detailed history, including: past and current illnesses;
    • surgeries;
    • allergies;
    • family history including genetic history, and ethnicity;
    • prior pregnancies;
    • a menstrual history, with specific attention for accurate dating of the pregnancy;
    • medications and supplements currently being taken;
    • psychosocial history, including mental health, depression; alcohol, tobacco and drug use; type of work; relationship status; domestic violence concerns; and
    • environmental and occupational exposure history.
  2. Counseling about: normal course of pregnancy;
    • frequency of visits, office hours;
    • when and how to contact the clinician;
    • balanced nutrition, recommended weight gain, vitamin supplementation, and foods and beverages to avoid;
    • exercise;
    • sexual activity;
    • environmental hazards;
    • health maintenance (e.g., dental health, appropriate use of seat belts);
    • HIV and recommendations for testing;
    • suggested readings; 
    • recommended vaccinations: influenza, Tdap, hepatitis A&B if at risk; and 
    • substance abuse or abuse screening, including tobacco, alcohol, and drugs, with interventions offered, as appropriate.
  3. Genetic counseling should include:
    • offering testing for cystic fibrosis with specific information about carrier frequency and sensitivity of the test;
    • offering testing as appropriate for ethnicity including:
      • Tay Sachs testing, such as for patients of Ashkenazi Jewish , French-Canadian, or Cajun descent;
      • Canavan’s disease and familial dysautonomia screening, such as for patients of Ashkenazi Jewish descent;
      • hemoglobin electrophoresis for those at risk for hemoglobin disorders, such as for patients of Asian, African, Caribbean, or Mediterranean descent;
      • others as appropriate to history, family history or ethnicity; and
    • offering counseling on methods available to screen or test for fetal aneuploidy.
  4. A detailed physical examination that includes blood pressure, height, weight and breast, heart, lung, abdominal, and pelvic examinations.
  5. Recommended laboratory testing, including: complete blood count (CBC) with indices,
    • blood group and Rh type determination,
    • antibody screen,
    • rubella immunity status (unless previously documented or adequate vaccination documented),
    • hepatitis B surface antigen,
    • hepatitis C antibody (if appropriate), 
    • HIV testing (unless declined by patient),
    • syphilis screen, 
    • varicella immunity status (if not known), 
    • urine culture, 
    • genetic screening (as selected by patient), 
    • cervical cytology (if appropriate), and 
    • gonorrhea and chlamydia screening if indicated.
  6. Identified medical problems and risk factors should be addressed and a problem list created.
  7. Folic acid or prenatal vitamin containing adequate folic acid should be advised.

Subsequent Visits

At every routine prenatal visit, an interval history should be obtained.Assessment should be made of the patient’s weight, blood pressure, and uterine size. Urine testing for protein and glucose should be obtained if indicated. Fetal assessment should include heart sounds and movement as appropriate for gestational age. Fetal presentation should be assessed in the late third trimester.

Testing in the second and third trimesters:

  • fetal survey ultrasound may be performed at 17–20 weeks;
  • TB testing should be performed in the early second trimester if indicated;
  • CBC and glucose screening, if appropriate, at 24–28 weeks;
  • serial antibody testing should be performed in Rh negative patients as indicated;
  • STD testing should be repeated at 32–36 weeks for patients at risk; and
  • Group B Streptococcus screening should be done, if appropriate, at 35–38 weeks (see Guideline 13).
Counseling in the second and third trimester may include:
  • offering a fetal survey ultrasound;
  • reviewing instructions on when/how to call the clinician;
  • reviewing and discussing informed consent for labor and delivery;
  • reviewing and discussing the health care proxy;
  • reviewing warning signs of preterm labor;
  • reviewing expected fetal movements;
  • preparation for childbirth including availability of childbirth classes, analgesic options, and expectations during labor and birth;
  • discussing and encouraging breastfeeding;
  • selecting a pediatrician;
  • newborn issues, including circumcision, infant care classes, infant CPR classes, car seats; and
  • postpartum recovery including postpartum appointments, maternity leave, depression, and contraception.

Additional interventions:

  • during flu season, influenza vaccine should be recommended to pregnant patients;
  • TdaP vaccine should be offered in the third trimester;
  • other vaccinations may be considered in pregnancy as indicated (e.g., hepatitis B vaccination for women at risk); and
  • Rh immunoglobulin should be provided for Rh negative woman at approximately 28–30 weeks gestation, or as indicated (bleeding, trauma, or amniocentesis, external version); and postpartum as indicated.

 

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May 1, 2014
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