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Fast Facts

A brief refresher with useful tables, figures, and research summaries

Preconception Care and Pregnancy

Preconception Care

Preconception counseling: Many women seek advice from their primary care physician before trying to conceive. Preconception counseling includes the following:

  • review of medications for teratogenic risks

  • ensuring chronic conditions are well controlled

  • recommending folic acid supplementation

  • ensuring vaccines are up to date, including influenza and Covid-19

  • assessment for dangerous environmental exposures, including Zika virus

  • discussion of family genetic history

  • screening for depression and anxiety disorders; intimate partner violence; and alcohol, tobacco, and illicit drug use

Recommendations for Preconception Counseling and Care is a comprehensive guide developed by the American Academy of Family Physicians (AAFP).

Key considerations prior to pregnancy:

  • Folic acid supplementation: All women contemplating pregnancy (and all women using inadequate contraception who are at risk of pregnancy) should begin a folic acid supplement to reduce the risk of neural tube defects.

  • Immunization status: Consider screening for varicella and rubella with routine labs before conception because live vaccines can’t be administered during pregnancy.

  • Medication reconciliation: A thorough medication reconciliation should be performed, with discontinuation or replacement of medications that are known to be teratogenic and encouragement to continue medications that are clinically necessary.

For more guidance and information on medication safety during pregnancy, see Over-the-Counter Medications in Pregnancy and the table below of AAFP medication guidelines for common medical conditions in women considering pregnancy:

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(Source: Recommendations for Preconception Counseling and Care. Am Fam Physician 2013. Reprinted with permission.)

Pregnancy

Comanagement of Medical Issues during Pregnancy

It is important to know how to manage chronic medical problems, such as diabetes, hypertension, depression, asthma, and hyperlipidemia throughout pregnancy. See the table above and the reviews and guidelines associated with this rotation guide for more information on the management of specific conditions, including diabetes, chronic hypertension, asthma, venous thromboembolism, and depression. Keep in mind the following general points:

  • Contraindications: Some medications commonly used to treat these conditions are contraindicated in pregnancy.

  • Dose adjustment: The dose of some medications (e.g., levothyroxine) needs to be increased during pregnancy.

  • Pain management: Acetaminophen is generally considered safe, but nonsteroidal anti-inflammatory drugs (NSAIDs) should be avoided in pregnancy.

Medication exposure during breastfeeding: After delivery, breastfeeding mothers often have similar questions and concerns about medication safety. The National Library of Medicine’s Drug and Lactation Database (LactMed) provides information on drug safety during breastfeeding and suggests therapeutic alternatives.

Covid-19 vaccination in pregnancy: The Centers for Disease Control and Prevention (CDC) recommends that all persons older than 6 months, including pregnant, recently pregnant, and lactating individuals, complete a primary two-vaccine Covid-19 series followed by an updated booster vaccine.

First-Trimester Bleeding

Some women with confirmed pregnancy present to the primary care office with first-trimester bleeding. The following algorithm is a helpful guide for the evaluation of patients with bleeding during the first trimester:

Evaluation of First-Trimester Bleeding
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(Source: Reproductive Health Access Project 2017.)

For more information on complications of pregnancy (including ectopic pregnancy and preeclampsia/eclampsia/HELLP syndrome, see Abdominopelvic Emergencies in the IM Emergency Medicine rotation guide.

Research

Landmark clinical trials and other important studies

Research

Treatment for Mild Chronic Hypertension During Pregnancy

Tita AT et al. N Engl J Med 2022.

In this multicenter randomized trial, targeting a blood pressure less than 140/90 mm Hg in pregnant women with mild chronic hypertension was associated with better pregnancy outcomes than a strategy of reserving treatment only for severe hypertension, with no increase in the risk of small-for-gestational-age birth weight.

Read the NEJM Journal Watch Summary

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Association of COVID-19 Vaccination in Pregnancy with Adverse Peripartum Outcomes

Fell DB et al. JAMA 2022.

In this Canadian retrospective cohort study, Covid-19 vaccination during pregnancy, compared with vaccination after pregnancy and with no vaccination, was not significantly associated with increased risk of peripartum complications.

Read the NEJM Journal Watch Summary

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Effectiveness of the BNT162b2 mRNA COVID-19 Vaccine in Pregnancy

Dagan N et al. Nat Med 2021.

This Israeli observational cohort study demonstrated high Covid-19 vaccine effectiveness similar to the general population in pregnant women.

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A Randomized Trial of Progesterone in Women with Bleeding in Early Pregnancy

Coomarasamy A et al. N Engl J Med 2019.

The administration of progesterone did not improve the incidence of live births in women with bleeding in early pregnancy.

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A Multicenter, Randomized Trial of Treatment for Mild Gestational Diabetes

Landon MB et al. N Engl J Med 2009.

In this randomized controlled trial, treatment of mild gestational diabetes did not reduce the risk of stillbirth or perinatal death or several neonatal complications, but it did reduce the risks of fetal overgrowth, shoulder dystocia, cesarean delivery, and hypertensive disorders.

Read the NEJM Journal Watch Summary

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Cognitive Function at 3 Years of Age after Fetal Exposure to Antiepileptic Drugs

Meador KJ et al. N Engl J Med 2009.

In this prospective, observational, multicenter study, in utero exposure to valproate was associated with an increased risk of impaired cognitive function at 3 years of age.

Read the NEJM Journal Watch Summary

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Hyperglycemia and Adverse Pregnancy Outcomes

The HAPO Study Cooperative Research Group. N Engl J Med 2008.

The HAPO study found an association between maternal glucose levels and increased birth weight.

Read the NEJM Journal Watch Summary

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Prevention of the First Occurrence of Neural-Tube Defects by Periconceptional Vitamin Supplementation

Czeizel AE and Dudás I. N Engl J Med 1992.

This landmark randomized controlled trial demonstrated that periconceptional folate-containing vitamin use decreased the incidence of a first occurrence of neural-tube defects.

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Reviews

The best overviews of the literature on this topic

Reviews

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COVID-19 Vaccination in Pregnancy

Kalafat E et al. Am J Obstet Gynecol 2022.

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Pregnancy Complicated by Venous Thrombosis

Greer IA. N Engl J Med 2015.

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Pregnancy and Infection

Kourtis AP et al. N Engl J Med 2014.

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Over-the-Counter Medications in Pregnancy

Servey J and Chang J. Am Fam Physician 2014.

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Depression During Pregnancy

Stewart DE. N Engl J Med 2011.

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Chronic Hypertension in Pregnancy

Seely EW and Ecker J. N Engl J Med 2011.

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Asthma in Pregnancy

Schatz M and Dombrowski MP. N Engl J Med 2009.

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Guidelines

The current guidelines from the major specialty associations in the field

Guidelines

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Management of Diabetes in Pregnancy

American Diabetes Association. Diabetes Care 2020.

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Recommendations for Preconception Counseling and Care

Farahi N and Zolotor A. Am Fam Physician 2013.

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Additional Resources

Videos, cases, and other links for more interactive learning

Additional Resources

LactMed

National Institute of Child Health and Human Develoment 2006.

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