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.
Confidence votes 20.1K. The due date is usually calculated by adding 266 days to the last menstrual period date; this is approximately nine to nine and a half months. Full term is considered anywhere from 38 to 42 weeks of pregnancy.