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.
To calculate your due date, your doctor will take the first day of your last menstrual period (LMP), and add 280 days (the equivalent of 40 weeks). For example, if your last period started on September 1, your due date would be June 7.