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GBZ 49-2014 PDF in English

GBZ 49-2014 (GBZ49-2014) PDF English
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GBZ 49-2014: PDF in English

GBZ 49-2014
ICS 13.100
C 60
Replacing GBZ 49-2007
Diagnosis of occupational
noise-induced deafness
Issued by. National Health and Family Planning Commission of the
People’s Republic of China
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Diagnostic principles ... 5
4 Diagnostic grading ... 5
5 Treatment principles ... 5
6 Instructions for using this Standard correctly ... 5
Annex A (informative) Instructions for using this Standard correctly ... 6
This Standard is developed according to “Law of the People's Republic of China on
Prevention and Treatment of Occupational Diseases”.
Clause 5 of this Standard is recommended, and the rest are mandatory.
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GBZ 49-2007 “Diagnostic criteria of occupational noise-
induced deafness”. Compared with GBZ 49-2007, the main technical changes are as
- CANCEL the observation object;
- INCLUDE the 4 000 Hz threshold audiometry IN the diagnostic grading indicators,
for weighted calculation;
- LIST the binaural high-frequency (3 000 Hz, 4 000 Hz, 6 000 Hz) mean threshold
audiometry of ≥ 40 dB AS a prerequisite for the diagnosis of occupational noise-
induced deafness.
Responsible drafting organizations of this Standard. Shanghai Pulmonary Hospital
Affiliated to Tongji University (Shanghai Occupational Disease Hospital), Shanghai
Municipal Center for Disease Control and Prevention.
Participating drafting organizations of this Standard. Beijing Center for Disease Control
and Prevention, Guangdong Province Hospital for Occupational Disease Prevention
and Treatment, Jiangsu Provincial Center for Disease Control and Prevention,
Zhejiang Province Hospital for Occupational Disease Prevention and Treatment,
Xixiang Health Authority of Bao'an District, Shenzhen Province.
Main drafters of this Standard. Zhang Xunmiao, Zhang Minhua, Wang Jianxin, Ruan
Yanjun, Zhang Qiaoyun, Yang Aichu, Jiang Zhirong, Ma Gufeng, Chen Jiabin, Yuan
Weimin, Xie Lanlan, Gu Minghua.
The historical editions of the standard replaced by this Standard are as follows.
- GB 16152-1996;
- GBZ 49-2002;
- GBZ 49-2007.
Diagnosis of occupational noise-induced deafness
1 Scope
This Standard specifies the diagnostic principles, diagnostic grading and treatment
principles of occupational noise-induced deafness.
This Standard applies to the diagnosis and treatment of hearing loss caused by long-
term occupational exposure to noise.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the dated edition cited applies. For undated
references, the latest edition of the referenced document (including all amendments)
GBZ 2.2 Occupational exposure limits for hazardous agents in the workplace - Part
2. Physical agents
GB/T 4854.1 Acoustics - Reference zero for the calibration of audiometric
equipment - Part 1. Reference equivalent threshold sound pressure levels for pure
tones and supra-aural earphones
GB/T 7341.1 Electroacoustics - Audiological equipment - Part 1. Pure-tone
GB/T 7582 Acoustics - Statistical distribution of threshold audiometry as a function
of age
GB/T 7583 Acoustics - Pure tone air conduction threshold audiometry - For hearing
conservation purposes
GB/T 16180 Standard for identify work ability - Gradation of disability caused by
work-related injuries and occupational diseases
GB/T 16403 Acoustics - Audiometric test methods - Basic pure tone air and bone
conduction threshold audiometry
Annex A
Instructions for using this Standard correctly
A.1 The clinical feature of the hearing loss caused by occupational exposure to noise
is the early hearing loss to high frequencies, which gradually affects the speech
frequency, leads to sensorineural deafness. “Noise work” in this Standard refers to the
work where the noise level in the workplace exceeds the “occupational exposure limits
for hazardous agents in the workplace”, that is, 8 h equivalent sound level (A weighted)
is ≥ 85 dB (see GBZ 2.2).
A.2 The hearing assessment of occupational noise-induced deafness is based on pure
tone threshold audiometry test results. The threshold deviation of the test results of the
repeatability of pure tone threshold audiometry at each frequency shall be ≤ 10 dB.
The hearing loss shall comply with the characteristics of noise-induced hearing
impairment. To exclude the impact of temporary threshold audiometry shift, the people
under test shall leave the noise environment for 48 h, which is taken as the screening
time of hearing test. If the screening audiometry results have reached the level of
noise-induced deafness, the review shall be carried out, and the review time is 1 week
after leaving the noise environment.
A.3 The audiometer shall meet the requirements of GB/T 7341.1, and shall be
calibrated according to GB/T 4854.1.
A.4 During the pure-tone audiometry, if the people under audiometry has no response
at the maximum output value of the audiometer, calculate as the maximum output
A.5 The pure-tone audiometry results shall be corrected according to age and sex
according to GB/T 7582 (see Table A.1).
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.