试题与答案

有关安全期避孕法的描述,不正确的是() A.在排卵前后4~5天内是易孕期,其他时间为

题型:单项选择题 A1/A2型题

题目:

有关安全期避孕法的描述,不正确的是()

A.在排卵前后4~5天内是易孕期,其他时间为安全期

B.避开排卵前后2~3天,其他时间有性生活是安全的

C.使用安全期避孕法者应首先确定排卵日期

D.安全期避孕法并不十分可靠

E.月经不规则的妇女不宜选用安全期避孕法

答案:

参考答案:B

解析:成熟卵子排出后约可存活1~2天,受精能力最强的时间是排卵后24小时内,精子进入女性生殖道可存活2~3天。因此,排卵前后4~5天内为易孕期,其他时间被视为安全期。在安全期内进行性交达到避孕目的,称为安全期避孕。使用安全期避孕者,应该判断自己的排卵日期以确定安全期。但因妇女排卵时间可受情绪等影响而发生额外排卵,因此安全期避孕法并不可靠,有20%的失败率。

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