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:10/22/2014)... 2014 On Saturday, October 25, 2014, the ... family health and fitness fair ¡Vive tu vida! Get Up! ... good nutrition for better health and wellness for people of ... and open to the public, will be held at Dean ... am to 1:00 pm. , “¡Vive tu Vida! Get ...
(Date:10/22/2014)... Medical Solutions , the ... to announce that our co-founder and CFO, Scott ... Staffing 100 for 2014. Anderson was also named ... people in the staffing industry,” in 2013.     , ... healthcare staffing company in the U.S., was named ...
(Date:10/22/2014)... Va. (PRWEB) October 22, 2014 For Dr. ... to make money; it’s an extension of her life’s mission. ... latest venture as the owner of FirstLight HomeCare, make it ... “It’s important to me that my work makes a difference ... harbored an entrepreneurial spirit, so after much research, I felt ...
(Date:10/22/2014)... Oct. 21, 2014 (HealthDay News) -- The United ... arriving from Ebola-affected nations of West Africa land ... them for infection with the virus. In ... Johnson noted that 94 percent of air passengers ... at one of these five airports -- New ...
(Date:10/22/2014)... RESTON, Va. (PRWEB) October 22, 2014 ... Healthcare Innovation , which is dedicated to distribute ... efficiency of healthcare delivery worldwide announced the development ... in which patients expect when receiving healthcare. These ... definition for patient-centered care: “providing care that is ...
Breaking Medicine News(10 mins):Health News:Brownsville Community Health Center Presents Fourth Annual ¡Vive Tu Vida! Get Up! Get Moving!® Event 2Health News:Brownsville Community Health Center Presents Fourth Annual ¡Vive Tu Vida! Get Up! Get Moving!® Event 3Health News:Brownsville Community Health Center Presents Fourth Annual ¡Vive Tu Vida! Get Up! Get Moving!® Event 4Health News:Medical Solutions Co-Founder/CFO Scott Anderson Named to Staffing Industry Analysts’ 2014 Staffing 100 2Health News:Medical Solutions Co-Founder/CFO Scott Anderson Named to Staffing Industry Analysts’ 2014 Staffing 100 3Health News:Dr. Iris Hunter to Host Grand Opening of FirstLight HomeCare Tomorrow 2Health News:Passengers From Ebola-Affected Countries Must Land at Designated U.S. Airports 2Health News:Passengers From Ebola-Affected Countries Must Land at Designated U.S. Airports 3Health News:The Sullivan Institute for Healthcare Innovation Announces Release of Guiding Principles for Patient Experience-Centered Care 2
(Date:10/22/2014)... Oct. 22, 2014  Rescheduling of hydrocodone combination ... the pain market, according to a new primary ... firm providing market research and consultation exclusively in ... - http://photos.prnewswire.com/prnh/20141021/153440 In ... hydrocodone combination products from Schedule III to Schedule ...
(Date:10/22/2014)... Antigen Discovery Inc. (ADi), a privately held ... the receipt of a National Institutes of Health (NIH) ... Institute of Dental and Craniofacial Research (NIDCR). The one-year ... Protein Microarray Chip, which will contain every protein in ... in the development of safe and effective vaccines and ...
(Date:10/22/2014)... , Oct. 22, 2014 Moms are ... health trackers for themselves and their kids, according to ... Report: Health & Fitness Go Mobile for Moms, the ... Series. BabyCenter, the number 1 pregnancy and parenting web ... that 55 percent of moms surveyed say they can,t ...
Breaking Medicine Technology:Hydrocodone: Rescheduled, Repositioned & Reinvented 2Hydrocodone: Rescheduled, Repositioned & Reinvented 3Biomarker Discovery Company, Antigen Discovery Inc., Awarded an NIH Phase I Small Business Innovation Research Grant to Develop a Pan-HIV Protein Microarray Chip 2BabyCenter Finds Mom Ready to Live the "Measured Life" in its U.S. Mobile Mom 2014 Report: Health & Fitness Go Mobile for Moms 2BabyCenter Finds Mom Ready to Live the "Measured Life" in its U.S. Mobile Mom 2014 Report: Health & Fitness Go Mobile for Moms 3BabyCenter Finds Mom Ready to Live the "Measured Life" in its U.S. Mobile Mom 2014 Report: Health & Fitness Go Mobile for Moms 4
Cached News: