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The timing of the “fertile window” in the menstrual cycle: day specific estimates from a prospective study

BMJ 2000; 321 doi: https://doi.org/10.1136/bmj.321.7271.1259 (Published 18 November 2000) Cite this as: BMJ 2000;321:1259

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Smart thermometer locates "fertile window

To locate the fertile days of the current cycle about a million
women in Japan have purchased a smart thermometer trade-named Sophia. Word
has got around that it is reliable.
The inventor, Mr. K. Nishimura, had the chip made to turn the fertile days
sign on and off in accord with the data of the five previous cycles in the
memory: 1)Ogino rhythm, 2) temperature shift, 3) manual mucus input. Can't
miss.

Ogino: shortest cycle minus 19 days turns on sign. Temperature:
earliest shift in the memory minus 6-7 days.
Mucus: begins when inputed manually. No charting ncessary. Review of all
data can be recalled to window. With interface and software, data can be
shifted to computers.

Sign of fertile days turns off on day 4 past Peak mucus day,
or day 4 past temperature shift day, whichever is later.
To avoid human error, the temperature is recorded automatically. Takes two
minutes. Memory: 6 cycles.

For purchase in the USA, inquire at Lloydrem@bellsouth.net.

The author has competing interests insofar as he is a friend and advisor to
the inventor, and shares with him a strong humanitarian interest in
assisting families to achieve or postpone pregnancies without use of
chemicals or barriers. He receives no compensation for lecturing or
appearances, but does receive a small margin on sales of devices outside of
Japan.

Competing interests: No competing interests

21 November 2000
Anthony Zimmerman
Retired professor
Retired, Nanzan University, Nagoya, Japan