Management of Syphilis in Pregnancy – Evidence‑Based Recommendations
Screening Protocol
- Universal screening at the first prenatal visit using a nontreponemal test (VDRL or RPR) followed by confirmatory treponemal testing (FTA‑ABS or TPPA) is recommended for all pregnant individuals. 1
- Repeat screening in the third trimester is advised for pregnant individuals at high risk (e.g., uninsured, low‑income, sex workers, illicit‑drug users, residents of high‑morbidity regions). 1
- Repeat screening at delivery is advised for the same high‑risk groups to capture late seroconversion. 1
Treatment Regimens by Maternal Disease Stage
- Early syphilis (primary, secondary, or early latent < 1 year): administer benzathine penicillin G 2.4 million units intramuscularly as a single dose. 2
- Late latent syphilis or syphilis of unknown duration: administer benzathine penicillin G 2.4 million units intramuscularly once weekly for three consecutive weeks (total 7.2 million units). 2
- Neurosyphilis in pregnancy: treat with aqueous crystalline penicillin G 18–24 million units per day intravenously (given as 3–4 million units every 4 hours) for 10–14 days. 2
Penicillin Allergy Management (Non‑Negotiable)
- All pregnant individuals with reported penicillin allergy must undergo allergy evaluation and, if indicated, desensitization before receiving penicillin; no alternative antibiotics are acceptable for fetal treatment. 3, 1
- Alternative agents such as erythromycin, azithromycin, or ceftriaxone are ineffective for preventing congenital infection and should never be used as substitutes. 3, 1
Post‑Treatment Monitoring
- Monthly serologic follow‑up using the same nontreponemal test (VDRL or RPR) performed at diagnosis is required to assess treatment response. 1
- Treponemal tests should not be used to monitor treatment response because they remain positive despite effective therapy. 2
Timing of Treatment Relative to Delivery
- Treatment initiated less than 4 weeks before expected delivery is considered inadequate for preventing congenital syphilis; the newborn will require full evaluation and treatment. 2, 3
- Whenever possible, complete the full recommended penicillin regimen before delivery to maximize fetal protection. 2, 3