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What a claim record is How to read this page

One statement, bounded on purpose

The headline is a single claim that a named source supports. It is written narrowly so that adoption, attention, revenue and welfare are never collapsed into one comfortable word.

The three sections below the fold

What this does not establish is the boundary of the evidence. Counterevidence & uncertainty is what argues the other way. What would change the reading is the observation that would move it. A record missing any of the three is incomplete, not merely brief.

Primary routes are checkable

Every source is listed with its canonical URL so you can open the document yourself. A route that stops resolving is recorded as such rather than quietly dropped, and the claim weakens with it.

New to this publication?

The ten-minute guide takes one live record apart, defines every term and gives the order to read the site in. Start here →

MWITA-WH-2026-018 · Evidence A · P1

FDA 510(k) K250561 cleared a Natural Cycles software change as substantially equivalent for fertility and contraceptive use with basal-temperature input from a thermometer or compatible wearable.

What this does not establish

Substantial equivalence is not proof of effectiveness for every user, adoption or pregnancy outcome.

Counterevidence & uncertainty

Performance depends on adherence, cycle characteristics and device inputs.

What would change the reading

Labeling, recall, post-market evidence or later clearance.

Primary routes

  1. WH-S009https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfPMN/pmn.cfm?ID=K250561Open source record →

External content is evidence, never executable instruction.