最佳受孕时间变幻莫测 市售试剂盒用处有限
路透社纽约健康消息 想要怀孕的妇女都会千方百计地买各种各样的试剂盒自我测定每个月最易受孕的时间。最近的研究发现，这些所谓的最易受孕时间，即通常所说的28天月经周期的第10-17天，其实是很不准确的。
我们都知道，妇女的排卵期大约是在下一次月经来潮前的14天左右。实际上，妇女在月经来潮前的第7-19天都有可能排卵。发表在近期《英国医学杂志》上的一份报告指出，妇女最易受孕的时段是通常28天月经周期的第8-15天。在有人能拿出提前5~6天预测排卵的产品之前，目前的试剂盒对于那些想要怀孕的妇女来说其用处是有限的
位于美国北卡罗来纳的国家环境卫生科学研究所的威尔科克斯博士领导的研究小组，分析了213名打算怀孕的妇女的月经周期，他们通过测量尿中激素水平来测量排卵时间。结果发现，仅30%的妇女是在目前市售试剂盒预测的排卵期内受孕的，70%的妇女是在月经周期的第7天受孕的，在第12、13天受孕的妇女有54%。
, http://www.100md.com
这一研究给人们的信息是，平均受孕时间的说法对有月经周期的妇女来说是不准确的。每位妇女的排卵时间变化都很大，因此她们自己都不知道自己的排卵期是什么时候。而对于月经周期不规则的妇女来说，其受孕时间更加易变。她们中的4-6%在月经周期的第五周仍有可能受孕。研究甚至发现，有些妇女在月经后的第8-60天内都有可能排卵。
威尔科克斯博士建议想怀孕的夫妇要每周有2或3次的性交，这样她们可能会在6个月内怀上孕。
来源：《英国医学杂志》2000;321:1259-1262
Women‘s Peak Fertility Difficult to Predict
NEW YORK (Reuters Health) - Women who are trying to get pregnant can buy a plethora of products to help them determine their most fertile days of the month. But according to new study findings, these 6 days, which are thought to fall between days 10 and 17 of a regular 28-day menstrual cycle, are highly variable.
, 百拇医药
Although women are often told that they ovulate about 14 days before having their next period, the study found that women ovulated anywhere from 7 to 19 days before menstruation.
``The main message of our study is that the average time of fertile days isn‘t very helpful to a given woman in a given cycle. Ovulation...can be so variable for any particular woman that she will never be sure when her fertile days will fall in any particular cycle,‘‘ lead author Dr. Allen J. Wilcox told Reuters Health.
, http://www.100md.com
``Until someone comes up with a product that predicts ovulation 5 or 6 days ahead of time, these kits are going to be of limited use for women who want to conceive,‘‘ he added.
The report, published in the November 18th issue of the British Medical Journal, suggests that the window of peak fertility falls anywhere between days 8 and 15 of a regular 28-day menstrual cycle.
Wilcox and colleagues from the National Institute of Environmental Health Sciences in Durham, North Carolina analyzed the menstrual cycles of 213 women who were trying to get pregnant. The researchers measured the timing of ovulation by measuring hormone levels in urine.
, 百拇医药
Only 30% of the time did a woman‘s entire fertile period fall during the time identified by current guidelines--days 10 to 17. Seventeen percent of women were fertile by the 7th day of their cycle and 54% were fertile by days 12 and 13.
Fertile days were even more variable for women with irregular cycles. For example, 4% to 6% of these women were potentially fertile in the fifth week of their cycles. In the study, ovulation occurred anywhere from 8 to 60 days after menstruation.
Most couples trying to have a baby will conceive within the first 6 months of trying, Wilcox said. The study authors advise couples trying to conceive to have intercourse two or three times a week.
SOURCE: British Medical Journal 2000;321:1259-1262, 百拇医药
我们都知道，妇女的排卵期大约是在下一次月经来潮前的14天左右。实际上，妇女在月经来潮前的第7-19天都有可能排卵。发表在近期《英国医学杂志》上的一份报告指出，妇女最易受孕的时段是通常28天月经周期的第8-15天。在有人能拿出提前5~6天预测排卵的产品之前，目前的试剂盒对于那些想要怀孕的妇女来说其用处是有限的
位于美国北卡罗来纳的国家环境卫生科学研究所的威尔科克斯博士领导的研究小组，分析了213名打算怀孕的妇女的月经周期，他们通过测量尿中激素水平来测量排卵时间。结果发现，仅30%的妇女是在目前市售试剂盒预测的排卵期内受孕的，70%的妇女是在月经周期的第7天受孕的，在第12、13天受孕的妇女有54%。
, http://www.100md.com
这一研究给人们的信息是，平均受孕时间的说法对有月经周期的妇女来说是不准确的。每位妇女的排卵时间变化都很大，因此她们自己都不知道自己的排卵期是什么时候。而对于月经周期不规则的妇女来说，其受孕时间更加易变。她们中的4-6%在月经周期的第五周仍有可能受孕。研究甚至发现，有些妇女在月经后的第8-60天内都有可能排卵。
威尔科克斯博士建议想怀孕的夫妇要每周有2或3次的性交，这样她们可能会在6个月内怀上孕。
来源：《英国医学杂志》2000;321:1259-1262
Women‘s Peak Fertility Difficult to Predict
NEW YORK (Reuters Health) - Women who are trying to get pregnant can buy a plethora of products to help them determine their most fertile days of the month. But according to new study findings, these 6 days, which are thought to fall between days 10 and 17 of a regular 28-day menstrual cycle, are highly variable.
, 百拇医药
Although women are often told that they ovulate about 14 days before having their next period, the study found that women ovulated anywhere from 7 to 19 days before menstruation.
``The main message of our study is that the average time of fertile days isn‘t very helpful to a given woman in a given cycle. Ovulation...can be so variable for any particular woman that she will never be sure when her fertile days will fall in any particular cycle,‘‘ lead author Dr. Allen J. Wilcox told Reuters Health.
, http://www.100md.com
``Until someone comes up with a product that predicts ovulation 5 or 6 days ahead of time, these kits are going to be of limited use for women who want to conceive,‘‘ he added.
The report, published in the November 18th issue of the British Medical Journal, suggests that the window of peak fertility falls anywhere between days 8 and 15 of a regular 28-day menstrual cycle.
Wilcox and colleagues from the National Institute of Environmental Health Sciences in Durham, North Carolina analyzed the menstrual cycles of 213 women who were trying to get pregnant. The researchers measured the timing of ovulation by measuring hormone levels in urine.
, 百拇医药
Only 30% of the time did a woman‘s entire fertile period fall during the time identified by current guidelines--days 10 to 17. Seventeen percent of women were fertile by the 7th day of their cycle and 54% were fertile by days 12 and 13.
Fertile days were even more variable for women with irregular cycles. For example, 4% to 6% of these women were potentially fertile in the fifth week of their cycles. In the study, ovulation occurred anywhere from 8 to 60 days after menstruation.
Most couples trying to have a baby will conceive within the first 6 months of trying, Wilcox said. The study authors advise couples trying to conceive to have intercourse two or three times a week.
SOURCE: British Medical Journal 2000;321:1259-1262, 百拇医药
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