Pure-tone audiometry measures hearing thresholds at six standard frequencies

Evidence

Pure-tone audiometry (ISO 8253-1, 2010), as the name suggests, uses pure tones or other narrowband stimuli as test signals to measure the frequency-specific hearing thresholds. … This procedure is done separately for both ears, typically at least at the frequencies 250, 500, 1000, 2000, and 4000 Hz, and possibly also at 125 Hz and 6000 Hz and/or 8000 Hz. … Békésy audiometry uses a slow frequency sweep, thus measuring a continuous hearing threshold curve as a function of frequency. The steepness of the hearing threshold curve can be obtained from the results of Békésy audiometry. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 2707