has part has part characteristic of inheres in has modifier sensory perception of sound Hearing abnormality Hearing impairment HP:0001728 Hearing impairment HP:0001729 UMLS:C0018772 HP:0008560 HP:0000365 Hypacusis A decreased magnitude of the sensory perception of sound. HP:0008563 Hearing defect HP:0001754 UMLS:C1384666 UMLS:C0011053 UMLS:C0339789 Hearing loss can be categorized by which part of the auditory system is damaged, as conductive hearing loss, sensorineural hearing loss, and mixed hearing loss. Another axis of classification uses the degree of hearing impairment. The degree of hearing loss is computed by using a three frequency average taken at 500 Hz, 1,000 Hz and 2,000 Hz. The average of these three frequencies is called the Pure Tone Average (PTA). 0-20 dB is considered normal, 21-40 dB mild loss, 41-60 dB moderate loss, 61-70 dB moderately severe loss,71-90 dB severe loss, and greater than 90 dB profound loss. Note that the word deafness is occasionally used to describe partial hearing loss. The World Health Organization uses the word deafness to refer to complete loss of the ability to hear, and hearing impairment to refer to any degree of reduced hearing. SNOMEDCT_US:95828007 Hypoacusis SNOMEDCT_US:343087000 HP:0000404 SNOMEDCT_US:15188001 Deafness Fyler:4868 SNOMEDCT_US:103276001 Hearing loss abnormal decreased rate