Tag: "pregnancies" at biology news

New study of healthy men finds semen quality decreases with age

...r younger counterparts. One study of 8,515 planned pregnancies found that men older than 35 have half the chance of fathering a child within 12 months compared with men younger than 25, even when the age of the mother is considered. The study by UC Berkeley and Lawrence Livermore helps shed light on why paterna...

Costly tests unnecessary for some miscarriages, University of Pittsburgh geneticist says

...uted to chromosomal abnormalities, and one in five pregnancies end in miscarriage, many second and third miscarriages are likely to be simply by chance alone. In addition, other studies have shown that these couples have a 70 percent chance of having a successful subsequent pregnancy," said Dr. Hogge. "If there ...

Worm sex receptor identified

...estimates suggest that about five percent of human pregnancies result in embryos with an extra chromosome, he sai... in a cell division process called meiosis. These pregnancies usually end in miscarriage. "Human beings are really bad at meiosis," Greenstein said. "We hope tha...

Screening certain infants can be lifesaving, Wake Forest study shows

...ic counseling and prenatal diagnosis in subsequent pregnancies in affected families." The prenatal diagnosis may show that the baby is completely free of the mutation, or that they have only one copy of the defective gene from either the mother or the father. These babies will not develop the disorder. It is on...

Estrogen may protect against breast cancer

...tion including the potential for future successful pregnancies and lactation." Full-term pregnancy in humans, as well as rats, results in a long-term decrease in blood levels of growth hormone and prolactin, resulting in a reduced promotional environment for development of breast cancer. The study was conducte...

Transplantation Society Congress

... knowledge about organ donation U.S. registry of pregnancies following heart and lung transplantation reports results Intestinal transplants have become standard of care for children with intestinal failure Results with intestine transplants in children have improved in past seven years, reports one center...

Smoking decreases men's chances of fatherhood by IVF and ICSI

...n whose partners were not smokers. The number of pregnancies amongst couples receiving IVF treatment depended on several factors: the number of embryos transferred to the mother, smoking in men, sperm motility and female age. If the woman smoked, the number of eggs capable of being retrieved from her ovaries ...

Multiple births - their risks and how to prevent them

...na, Austria: The continuing high rate of multiple pregnancies in assisted reproduction is a major medical, psych...or IVF, or a combination. "The reason for multiple pregnancies is the drive to maximise effectiveness. More embryos per transfer means higher efficacy and a short...

Preeclampsia linked with higher risk of preterm delivery

...rations in blood samples between women with normal pregnancies including smokers, nonsmokers and women who had qu...infants, and to deliver them earlier in subsequent pregnancies even though they did not develop preeclampsia again. These results may indicate that abnormal impla...

Preeclampsia linked with higher risk of preterm delivery and later-life vascular disease

...en who had a prior preeclampsia, women with normal pregnancies and never-pregnant women. Investigators found that having a normal pregnancy is associated with a positive long-term effect on blood vessel behavior that is not present in women who had a previous preeclamptic pregnancy or in those who had never been...

New research shows women's fertility starts declining from late 20s and mens from late 30s

... had by then also started to decline). "Nearly all pregnancies fell within the fertile window and, on average, the day-specific probability of pregnancy declined for women from the late 20s onwards being around twice as high for women aged 19 to 26 as for women aged 35 to 39. When we controlled for the age of wo...

Researchers to compare prenatal treatments for serious twin complication

...centesis. Although TTTS occurs in only 200 to 1800 pregnancies annually in the U.S., the condition has a disproportionately high impact. In approximately 17 percent of cases in which a twin dies before, during or shortly after birth, the cause is TTTS. Estimates of the frequency of TTTS vary widely because of di...

Hopkins Bioethics Institute receives $9.9 million from Pew Trusts

...dy, it's common to do prenatal genetic testing for pregnancies at increased risk for certain genetic syndromes, and embryos created by in vitro fertilization can now be screened for some inherited diseases before they are implanted into the mother's womb. But these techniques in reproductive genetics are not eth...

UK researchers shed new light on a cause of recurrent miscarriages

...st prospective study into the outcome of untreated pregnancies in a group of women carrying a mutation in the Factor V Leiden gene** and with a history of recurrent miscarriages at around 12 weeks, showed that under 40% had live births compared with nearly 70% in a control group of women with a similar history b...

Differences between boys and girls show less than three weeks into pregnancy

...way that the placenta expresses proteins in female pregnancies and not to male hormones suppressing MSHCG, as has... X (female) chromosome. The study involved 347 IVF pregnancies with women being measured for MSHCG levels between one and three times from day 14 to day 20. There ...

Thyroid disease raises risk for birth defects

...ol or using illegal drugs. Overall, there were 108 pregnancies with 114 fetuses. The research team studied the charts for all children born from these pregnancies and recorded any medical problems during the neonatal period or subsequent years. Twenty-one babies...

A type of IVF treatment may cause abnormalities

...found through tests on amniotic cells that in ICSI pregnancies there are three times as many sex chromosome abnormalities, including loss of the Y chromosome. But the risk was still very low-only 10 out of almost 1600 fetuses created by ICSI had the defects. That doesn't mean there isn't a problem, says McElrea...

Gender issues related to spaceflight: A NASA perspective

...ceflight in low Earth orbit or deep space preclude pregnancies at this time. The National Council on Radiation Protection and Measurements guidelines limit radiation exposure to 500 mrem for an entire pregnancy and to only 50 mrem per month. The International Commission on Radiological Protection guidelines are ...

Major stress during pregnancy linked to autism

... during any certain four-week period in their pregnancies remained fairly constant during the study for normal and Down's syndrome pregnancies. Stress levels for the mothers of autistic children were nearly twice those of other mothers in the study...

Mother's herpes virus infection associated with schizophrenia in her offspring, Hopkins researcher finds

...arge-scale, nationwide study that monitored 55,000 pregnancies at 12 study sites in the United States between 1959 and 1966. The CPP also evaluated infants for physical and mental development during the first seven years of life and stored blood samples from mothers for later analysis. Of the 3,804 surviving of...

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