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:
TAG: There are few safe days menstrual cycle

(Date:4/17/2015)... April 17, 2015 “We have seen healing, ... the past and present,” said Chaplain Shawn Kafader of Friendship ... felt like they had anything to contribute have created beautiful ... overseen a new art therapy program that was launched to ... Masters student from School of the Art Institute in Chicago, ...
(Date:4/17/2015)... In Defense of Christians (IDC) Executive Director ... April 15th, the European Parliament joined its voice with ... Armenian Genocide, “paying tribute, on the eve of the ... Armenian victims who perished in the Ottoman Empire.” ... this timely and needed recognition of a tragic episode ...
(Date:4/17/2015)... DC (PRWEB) April 17, 2015 Representatives ... HHT Diagnoses and Treatment Act HR 1849 in congress ... diagnosis rates and treatment for patients with the genetic ... in the past, would be the first to create ... and appropriate treatment of hereditary hemorrhagic telangiectasia. This would ...
(Date:4/17/2015)... Hills, California (PRWEB) April 17, 2015 ... stands above in his new offering of platelet-rich plasma ... Orthopedic Sports Medicine (MOSM) is known for its ... Dr. Meier brings extensive surgical experience lacking in many ... and stem cell treatments are utilized for pain management ...
(Date:4/17/2015)... (PRWEB) April 17, 2015 Most dental ... dental restoration units are made overseas by foreign dental ... domestic labs remain unregulated in more than 40 states ... National Association of Dental Laboratories has created ... raise awareness among patients about the consequences that could ...
Breaking Medicine News(10 mins):Health News:Healing At Friendship Village Due To Art Therapy 2Health News:In Defense of Christians Condemns Armenian Genocide 2Health News:In Defense of Christians Condemns Armenian Genocide 3Health News:House Representatives Introduce Bill to Fight Genetic Disease 2Health News:Platelet-Rich Plasma, Stem Cell Therapy Now Offered By Dr. Meier At MOSM in Beverly Hills, California 2Health News:Platelet-Rich Plasma, Stem Cell Therapy Now Offered By Dr. Meier At MOSM in Beverly Hills, California 3Health News:National Association Urges Transparency in Dental Industry 2
(Date:4/17/2015)... 17, 2015 Today, the Pharmaceutical Research ... from 12 biopharmaceutical companies as "We Work For ... advocacy and community service. Established in ... were created by the biopharmaceutical industry to honor ... careers, but have also shown an outstanding commitment ...
(Date:4/17/2015)... Va. , April 17, 2015   ... distribution of radiopharmaceuticals, announced today that it has signed ... Molecular North America, Inc. (IBAM NA), to Illinois Health and ... to operate as an independent company headquartered in ... positioned to take advantage of new product and footprint ...
(Date:4/17/2015)... Research and Markets ( http://www.researchandmarkets.com/research/256szd/corporate ) ... of Pharma in 2014 - a Perspective of Mental ... their offering. For the first time, in ... reputation of the pharmaceutical industry held by patient groups ... of patient organisations representing all therapy areas. ...
Breaking Medicine Technology:PhRMA Applauds 2015 We Work For Health Champion Award Winners 2PhRMA Applauds 2015 We Work For Health Champion Award Winners 3Health Care System to Acquire IBA Molecular North America 2Health Care System to Acquire IBA Molecular North America 3Corporate Reputation of Pharma in 2014 - The Perspective of Mental Health Patient Groups - 1st Edition 2Corporate Reputation of Pharma in 2014 - The Perspective of Mental Health Patient Groups - 1st Edition 3
Cached News: