[1] Noise and Hearing Loss Prevention: Frequently Asked Questions. NIOSH Safety and Health Topic.
Roland, Peter (2004). Ototoxicity. BC Decker. p. 63. ISBN 978-1550092639.

The most commonly employed measure of auditory status is conventional audiometry (0.5-8 kHz).
Conn, P. Michael (2011). Handbook of Models for Human Aging. Academic Press. p. 911. ISBN 978-0-12-369391-4. 

For research purposes, or early diagnosis of presbycusis, ultra-high frequency audiograms can be measured.

In such cases the test frequencies can go as high as 20 kHz and require special audiometer calibration and headphones.
pure tone audiometry in otosclerosis from General Practice Notebook. Retrieved 2012
Kashio, A.; Ito, K.; Kakigi, A.; Karino, S.; Iwasaki, S. -I.; Sakamoto, T.; Yasui, T.; Suzuki, M.; Yamasoba, T. (2011).

"Carhart Notch 2-kHz Bone Conduction Threshold Dip:

A Nondefinitive Predictor of Stapes Fixation in Conductive Hearing Loss with Normal Tympanic Membrane". 

Archives of Otolaryngology - Head and Neck Surgery 137 (3): 236–240. doi:10.1001/archoto.2011.14. PMID 21422306.
pure tone audiometry in Meniere's disease from General Practice Notebook. Retrieved 2012
pure tone audiometry in noise deafness from General Practice Notebook. Retrieved 2012