Observed arrival · 2026-11-10
Potto, a pregnancy-measurement reference tool
A Japanese-language tool for calculating pregnancy dates and comparing entered hCG or ultrasound measurements with cited research data.
- For
- People comparing early-pregnancy measurements with research references
- Worth noticing
- For one cited IVF study, the page notes a BT7 sample of just 194 cycles and a discrepancy between the paper’s text and table.
Field notes
The dating calculator supports last-menstrual-period, confirmed-ovulation, embryo-transfer and clinician-provided due-date bases, with the assumptions for each stated on the page. Comparisons distinguish small early gestational-sac studies from later percentile data and warn that values outside a band are not, by themselves, evidence of an abnormal outcome. The hCG section also records a source-table discrepancy and limits its transfer-outcome figures to specified study conditions.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
One card from the complete issue