# K231274: Natural Cycles

- Pathway: 510(k) (Traditional)
- Applicant: Natural Cycles Nordic AB
- Decided: Aug 24, 2023 after 114 days
- Product code: PYT (Device, Fertility Diagnostic, Contraceptive, Software Application)
- Device class: 2
- Regulation: 21 CFR 884.5370
- Recalls of this device: none
- Data: FDA decisions to Oct 25, 2026; recalls to Oct 12, 2026

## Lineage
Longest line of descent: 2 generations back to DEN170052 (2018). 2 ancestors in all.
3 later devices descend from it; 3 cite it directly.
0 of 6 devices in its family (counting itself) have a Class I recall.

## Predicates on the family tree (from the FDA summary)
- K202897: Natural Cycles, Natural Cycles Nordic AB (2021) Summary page 4.

## Most influential descendants
- K253694: Natural Cycles (2026), 0 descendants of its own
- K250561: Natural Cycles (2025), 0 descendants of its own
- K241006: Natural Cycles (2024), 0 descendants of its own

## Indications for use
Natural Cycles is a stand-alone software application, intended for women 18 years and older, to monitor their fertility. Natural Cycles can be used for preventing a pregnancy (contraception) or planning a pregnancy (conception).

Source page: https://510kreport.com/device/K231274
Methodology: https://510kreport.com/methodology