2026 · Fertility and sterility · paywalled
Home pregnancy test sensitivity by test timing and cycle length with real-world use among pregnancy planners who conceived
Sundermann et al.
The finding, in our words
In a large real-world cohort of pregnancy planners using home urine tests, sensitivity was lower than expected before the expected period, with false negatives of 12.7% at 2 days, 21.4% at 3 days and 46.4% at 4 days before menses; sensitivity rose sharply thereafter to over 99% by 4 days after the expected period, and for any given test day, longer menstrual cycles were associated with higher sensitivity, especially among early testers.
A paraphrase to the Library’s standard, never the abstract. The source is one link away and is always the authority.