Natural Limits of Pregnancy Testing in Relation to the Expected Menstrual Period

Article Abstract:

About 10% of pregnancies will not be detected by a home pregnancy test if the test is done on the first day of the missed period, according to a study of 221 women. This study used a more sensitive test for human chorionic gonadotropin than most home test kits, which means the home test kits may miss more than 10% of pregnancies.

Evaluation, Diagnosis, Pregnancy, Pregnancy test kits, Pregnancy diagnosis, Home pregnancy tests

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Reduced fertility among women employed as dental assistants exposed to high levels of nitrous oxide

Article Abstract:

Women who are exposed to high levels of nitrous oxide in their occupation may have a higher risk of infertility than other women. Nitrous oxide is a gas that is used as a pain killer or as a carrier gas for other anesthetics. Among 418 female dental assistants between 18 and 39 years old who had become pregnant within a four-year period, 28% had become pregnant during the first menstrual cycle of unprotected intercourse. Eighty-seven percent of the women had conceived by the end of 13 menstrual cycles. A longer period of exposure to nitrous oxide was associated with a decreased ability to become pregnant. Nineteen women who were exposed to high levels of nitrous oxide five or more hours per week were less than half as likely to conceive during each menstrual cycle as unexposed women. Exposure to high levels of nitrous oxide may interfere with the secretion of reproductive hormones in women.

Health aspects, Nitrous oxide, Infertility, Female, Female infertility, Dental assistants

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Time of implantation of the conceptus and loss of pregnancy

Article Abstract:

In most pregnant women, the fertilized egg implants into the uterus between 8 and 10 days after fertilization. Implantation after that time increases the risk of miscarriage. This was the conclusion of a study of 221 women who were trying to get pregnant. Daily urine samples were analyzed for biological markers of fertilization and implantation. Of the 189 women who became pregnant, 84% experienced uterine implantation between 8 and 10 days after fertilization. The rates of miscarriage were 13% in those who implanted on day 9, 26% on day 10, 52% on day 11 and 82% after day 11.

Research, Miscarriage, Ovum implantation

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