In calendar method of contraception, first day of fertile period is?
Correct Answer: 10th day of shortest menstural cycle
Description: Shortest period gives information about the first day of the fertile period. The shortest cycle minus 18 days gives first day of fertile period. For example, in a cycle of 28 days (most common), first day of fertile period will be 10th day of cycle (28 —18 = 10).
Longest period gives information about the last day of the fertile period. The longest cycle minus 10 days gives the last day of fertile period. For example, in a cycle of 28 days, last day of fertile period will be 18th day of cycle (28 —10 = 18).
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Social & Preventive Medicine
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