Find how many days of backup protection may be needed when starting or switching birth control under current US CDC rules.

Compare two intercourse dates with an ultrasound-based conception window to see whether timing favors one possible father.

Estimate gestational-sac or yolk-sac visibility on transvaginal ultrasound and a possible scan date from an hCG trend.

Estimate vanishing-twin interference concern for an NIPT blood draw using timing, gestational age, and ultrasound type.

Estimate the chance that an NIPT redraw will return a result after a low-fetal-fraction no-call and find the first study-based redraw date.

Estimate procedure-related loss risk and the chance standard testing finds a missed trisomy after low-risk NIPT.

Estimate live-birth outcomes without trisomy 21, trisomy 18, or trisomy 13 before NIPT or after a screening result.

Estimate residual risk for trisomy 21, trisomy 18, or trisomy 13 after a low-risk or high-risk NIPT result, with optional CVS or amniocentesis context.

Estimate IVF transfer live birth odds by age, embryo day, PGT-A, embryos transferred, and up to 3 attempts with clear assumptions.

Classify a sperm DNA fragmentation percent into low, moderate, or high risk using your assay method or lab cutoffs, plus next-step questions.