HOME >> MEDICINE >> NEWS
There are a few 'safe' days in menstrual cycle

Guidelines for getting pregnant -- or avoiding pregnancy -- usually assume an average woman is fertile between days 10 and 17 of her menstrual cycle. But researchers at the National Institute of Environmental Health Sciences have demonstrated what some accidentally pregnant women may have long suspected: Only about 30 percent of women actually have their fertile window entirely within that timespan.

In fact, the researchers found, there is hardly a day in the menstrual cycle during which some women are not potentially fertile. Women in this study were of prime reproductive age (most between 25 and 35), when the menstrual cycles are most regular. Because teenagers and women approaching menopause have less regular cycles, their windows of fertility might be even more unpredictable.

Describing data from nearly 700 menstrual cycles of 213 healthy North Carolina women, NIEHS' Allen J. Wilcox, M.D., Ph.D., statistician David Dunson, Ph.D., and epidemiologist Donna Day Baird, Ph.D., reported in the British Medical Journal (Vol. 321, pp 1259-1262) that the timing of women's fertile window "can be highly unpredictable, even if their cycles are usually regular."

Dr. Wilcox, a physician and chief of epidemiology at NIEHS, said, "If the average healthy couple wants to get pregnant, they are just as well off to forget 'fertile windows' and simply engage in unprotected intercourse two or three times a week." As for those seeking to use the cycle to avoid pregnancy, the odds are not good. "Our data suggest there are few days of the menstrual cycle during which some women are not potentially capable of becoming pregnant - including even the day on which they may expect their next menses to begin," according to the new scientific report.

With cycle day one being the day of the actual onset of menstrual bleeding, the researchers showed that 2 percent of women were starting their fertile window by day four, 17 percent by day seven. More tha
'"/>

Contact: Bill Grigg
grigg@niehs.nih.gov
301-402-3378
NIH/National Institute of Environmental Health Sciences
16-Nov-2000


Page: 1 2

Related medicine news :

1. Will an apple a day keep the doctor away? There are better food choices, research notes
2. Deaths Related To Intrapartum Asphyxia - Is There A Problem With Prevention?
3. Air pollution, even at safe levels, is bad for the heart
4. Scientific forum addresses menstrual cycle as vital sign
5. Heavy menstrual periods associated with economic loss
6. Causes of menstrual migraine explored
7. Energy balance, not exercise, key to athletic menstrual disturbance
8. Investigational oral contraceptive reduces premenstrual and menstrual symptoms
9. Tracing the life cycle of a manmade disease
10. Urban hospitals bear the brunt of motorcycle injuries
11. Weekly cycles of once-daily anti-HIV drugs could reduce cost of HIV treatment

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:5/2/2016)... ... May 02, 2016 , ... The ... the 2016 Main Residency Match® (“the Match”), the system through which U.S. and ... institutions. A record-high 30,750 positions were placed in the 2016 Match, and 29,572 ...
(Date:5/2/2016)... (PRWEB) , ... May 02, 2016 , ... MedPro Waste ... mail back service. MedPro now offers its mail back service for an all-inclusive ... we are now able to provide service to all of the clients in the ...
(Date:5/2/2016)... ... May 02, 2016 , ... Visceral fat, also known as ... kidneys, liver and pancreas. If not properly addressed, visceral fat can lead to ... Medicine, Medical Oncology and Palliative Care, warns against the dangers of visceral fat. ...
(Date:5/2/2016)... ... 02, 2016 , ... The Sixth Annual Lifestyle Intervention Conference ... Hotel in Las Vegas, NV from October 17–19, 2016. The Nevada Chapter ... , This year’s conference will offer presentations featuring new treatment tracks, industry ...
(Date:5/2/2016)... ... May 02, 2016 , ... Atlantic Information Services, Inc. (AIS) is pleased ... Model Could Transform the Pharma Landscape .” CMS recently proposed a test of alternate ... provider-administered drugs while preserving care provided to beneficiaries. The webinar will review the details ...
Breaking Medicine News(10 mins):
(Date:4/28/2016)... NEW YORK , April 28, 2016 /PRNewswire/ ... will notably complement the company,s valve repair and ... the move also places Abbott more firmly into ... one of the fastest growing device areas, with ... to its recent report,  Advanced Remote Patient ...
(Date:4/28/2016)... Calif. , April 28, 2016  Marking ... widely accessible breast and ovarian cancer risk test, ... panel analyzing 30 genes that highly impact the ... women. Available today, the Color Test analyzes hereditary ... prostate, stomach, and uterine cancers. The Color Test ...
(Date:4/28/2016)... , April 28, 2016  The blood testing market ... dollars, according to Kalorama Information and The Freedonia Group ... and nucleic acid testing.  The healthcare research firm said ... in developing blood collection stations and in improving testing ... Kalorama Information,s report, Blood Testing Market in ...
Breaking Medicine Technology:
Cached News: