Polysomnography is used to diagnose, or rule out, many types of sleep disorders including narcolepsy, idiopathic hypersomnia, periodic limb movement disorder (PLMD), REM behavior disorder, parasomnias, and sleep apnea.
Calculating Due Date: Estimated Due Date. Based on the last menstrual period, the estimated due date is 40 weeks from the first day of the period. This is just an estimate since only about 5% of babies are born on their estimated due date.
Once your pregnancy has been confirmed, what you most want to know is your due date. The average length of a pregnancy is 40 weeks, or 280 days, from the first day of the last normal menstrual period.Calculating the due date, or expected date of delivery, for a pregnancy is quite simple, then, if you know that date.Simply add nine months and seven days to the date, and you've got your pregnancy due date. Here's an example of how it works: Say the first day of the last normal menstrual period was January 1st.nce your pregnancy has been confirmed, what you most want to know is your due date. The average length of a pregnancy is 40 weeks, or 280 days, from the first day of the last normal menstrual period.