The test tones listed in this regulation shall meet the allowable octave-band ambient noise levels which are noted in the following table taken from page 5 of the May 1985 ASHA journal: Test frequency 500 1000 2000 4000 Octave-band cutoff 300 600 1200 2400 Frequencies 600 1200 2400 4800 Octave-band level: Ear covered with earphone mounted in MX-41/AR cushion 21.5 29.5 34.5 42 Plus ASHA screening level 20 20 20 20 Resultant maximum ambient noise level allowable for ASHA screening 41.5 49.5 54.5 62