what is psg
Polysomnography (PSG), a type of sleep study, is a multi-parametric test used in the study of sleep and as a diagnostic tool in sleep medicine. The test result is called a polysomnogram, also abbreviated PSG. The name is derived from Greek and Latin roots: the Greek ÏÎ¿Î»ÏÏ (polus for many, much, indicating many channels), the Latin somnus (sleep), and the Greek Î³ÏÎ¬ÏÎµÎ¹Î½ (graphein, to write).