HOME >> BIOLOGY >> NEWS
New study establishes when pregnancy starts

41 lasted at least six weeks past the last menstrual cycle, and the other 48 ended in early loss, the scientist said. Among pregnancies lasting six weeks or more, the first detectable rise in the level of a hormone known as chorionic gonadotropin (hCG) -- an indicator of successful attachment of a fertilized egg to the uterus wall -- occurred six to 12 days after ovulation.

"The risk of early loss was strongly related to the time of implantation," the authors wrote. "Early loss was least likely when implantation occurred by the ninth day (13 early losses among 102 pregnancies, or 13 percent) rising to 26 percent (14 of 53 pregnancies) when implantation occurred on the 10th day, 52 percent (12 of 23) on the 11th day and 82 percent (9 of 11) with implantation after day 11."

Three pregnancies in which the first rise in hormone occurred after day 12 ended by themselves.

"This study was first intended to identify the proportion of pregnancies that were lost very early before women knew they were pregnant," Wilcox said. "But we also were able to look at the date on which pregnancy could first be detected in relation to ovulation.

"The first detection of pregnancy is really the first detection of hCG, which rises very rapidly once the fertilized egg attaches to the uterus. That's in fact the most hidden event of pregnancy and has never been seen before."

Fertilization begins about a week earlier when egg and sperm unite, he said. Many fertilized eggs, however, never succeed in clinging to the uterine wall where they can grow into an embryo, fetus and, eventually, a baby.

"This is the first really concrete information we have about when pregnancy starts in humans - how long after fertilization does pregnancy begin," Wilcox said. "It probably has implications for assisted reproduction -- the way medicine is able to manipulate reproductive processes to encourage pregnancy - possibly by increasing the nar
'"/>

Contact: David Williamson
David_Williamson@unc.edu
919-962-8596
University of North Carolina at Chapel Hill
10-Jun-1999


Page: 1 2 3

Related biology news :

1. Student science contest participation influences study, career choices, alumni say
2. New study shows hope for treating inhalant abuse
3. International study findings link acne-like rash to effectiveness of new targeted cancer treatment
4. Cigarette smoke causes breaks in DNA and defects to a cells chromosomes, Pitt study finds
5. New study indicates arsenic could be suitable as first-line treatment in type of leukaemia
6. Phase II trials of second-generation antisense cancer drug planned following successful early study
7. Preclinical safety study shows adipose-derived stem cells improve heart function after heart attack
8. Indiana University, EPA to study airborne PCBs
9. K-State, other universities to study how climate affects plant evolution
10. USC study links historical increases in life span to lower childhood exposure to infection
11. Washington University in St. Louis leads group studying aging process

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: New study establishes when pregnancy starts

(Date:12/19/2014)... Dec. 18, 2014  23andMe, Inc., the leading personal genetics company, ... differences in genetic ancestry of individuals from across ... arrived more than four hundred years ago, the ... for peoples from different continents. This study illuminates how American ...
(Date:12/17/2014)... Dec. 15, 2014  HITLAB SM announced today its ... confirm its adherence to current U.S. Food and Drug ... regulated smart device and smart phone application trials utilizing ... "HITLAB is determined to improve global healthcare ...
(Date:12/15/2014)... DUBLIN , Dec. 12, 2014 Research and Markets ... of the "Global Facial Recognition Market 2015-2019" ... http://photos.prnewswire.com/prnh/20130307/600769 Facial recognition is a technology ... measures the overall facial feature of a person such ...
Breaking Biology News(10 mins):23andMe Study Sketches Genetic Portrait of the United States 223andMe Study Sketches Genetic Portrait of the United States 323andMe Study Sketches Genetic Portrait of the United States 4HITLAB Completes GCP Audit for FDA Smart Device & App Compliance 2Global Facial Recognition Market 2015-2019: Key Vendors are 3M Cogent, Cognitec Systems, NEC and Safran Group 2Global Facial Recognition Market 2015-2019: Key Vendors are 3M Cogent, Cognitec Systems, NEC and Safran Group 3
(Date:1/23/2015)... MD (PRWEB) January 23, 2015 Portal ... modern digital workplaces on Microsoft Office 365 and SharePoint ... Future 50 Award program for being one of the region’s ... revenue and employee growth. , “To be recognized a ...
(Date:1/22/2015)... 2015  Transwestern | RBJ today announces the firm brokered a ... Shire a leading biopharmaceutical company, at Two Ledgemont Center in ... Robert Richards , president, and Brian Cohen , senior ... five-floor building at 95 Hayden Ave. Photo - ...
(Date:1/22/2015)... Cambridge Semantics, the leading provider of smart data solutions driven ... record-breaking year across the board for the company. , ... and our Smart Data solutions, our customers were able to ... to record growth for the company in 2014,” said Alok ...
(Date:1/22/2015)... Rootstown, OH (PRWEB) January 22, 2015 Crystal ... announced today that it has received AOAC-PTM Certifications for the ... O111, O121, and O145; collectively referred to as STEC or ... at 1 colony forming unit (cfu) per 325 g of ...
Breaking Biology Technology:Washington SmartCEO Announces Portal Solutions as 2015 Future 50 Award Winner Second Year in a Row 2Washington SmartCEO Announces Portal Solutions as 2015 Future 50 Award Winner Second Year in a Row 3Transwestern | RBJ Advises Shire in 202,000 SF Lease, Creating Boston's Largest Suburban Biotech Campus 2Cambridge Semantics Announces Record Results for 2014 2Crystal Diagnostics Awarded AOAC-PTM Accreditation for the Rapid Detection of “Big 6” E.coli Food Pathogens 2
Cached News: