Safe Period or Rhythm
method of Family Planning
This method is based on an obervation
that the ovulation in females takes place 2 weeks before
mens. Now as we know that the mens cycles in women may
not be on precise day every month, the calculation of the
safe period is done on the basis of duration of 12
previous cycles. First note down the the shortest and the
longest cycles during the last 12 cycles.
The first fertile day will be minus 18 days from shortest
cycle.
The last fertile day would be minus 11 days from the
longest cycle.
For example : - if the short
cycle is 25 days the first fertile day would be ( 25-18 )
- 7th day
if the longest cycle is 32 days, the last fertile day
would be ( 32-11 ) - 21st day.
Thus there should be abstinence for 2 weeks from 7th to
21st day.
This method is based upon observation of
Ogino, in 1930 in Japan and Knaus, in 1933 in Austria.
One should keep in mind that this method of contraception
is some what crude.
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