Perinatal Depression Screening Frequency and Timing: Systematic Review of Detection Rates

Abstract

Introduction: Universal screening for perinatal depression (during pregnancy and up to 12 months postpartum) is recommended, but optimal frequency and timing remain unknown. Screening once may miss cases with onset in late pregnancy or late postpartum. This review compares detection rates by screening schedule.

Methods: We searched MEDLINE, PsycINFO, and CINAHL for studies administering the Edinburgh Postnatal Depression Scale (EPDS) at two or more timepoints in perinatal women, reporting new case detection at each timepoint. Primary outcome: proportion of depression cases (EPDS ≥13 or diagnostic interview) detected at first screen vs. cumulative detection across all screens. No meta-analysis due to timing heterogeneity.

Results: Seventeen studies (n=12,854 women) met inclusion. Screening schedules varied: once in pregnancy (20–28 weeks), once postpartum (6 weeks), or multiple (pregnancy + 6 weeks + 6 months). Single pregnancy screen detected 41% (range 33–52%) of all eventual perinatal depression cases. Single 6-week postpartum screen detected 54% (45–62%). Adding a second screen (pregnancy + 6 weeks) increased detection to 81% (74–88%). Third screen (6 months) added 12% (9–16%). False-positive rate (EPDS ≥13 without depression diagnosis) was 18% for single screen, 28% for two screens.

Discussion: A single screen misses half of perinatal depression cases. Two screens (third trimester and 6 weeks postpartum) detect >80% of cases while managing false positives. Late postpartum (6 months) screening identifies additional cases but with diminishing returns.

Conclusions: Perinatal depression screening should occur at least twice: once in third trimester and once at 6 weeks postpartum. Adding a 6-month screen is reasonable in high-risk populations