Compensation for Occupational Injuries and Diseases Act, 1993 (Act No. 130 of 1993)Circular InstructionsCircular Instruction No. 171 - Determination of Permanent Disablement resulting from Exposure to Excessive Noise and Trauma in Industry5. Calculation of Permanent Disablement |
| 5.1 | The better of the two diagnostic audiograms will be used: Ensure that all documentation (4) is present and correct. |
| 5.2 | Calculate (from PLH tables - Annexure A) a PLH for each of the following frequencies: 500, 1000, 2000, 3000 and 4000 Hz (Air conduction results to be taken except if specified otherwise by the medical officer). |
| 5.3 | Sum the values for each frequency to obtain the PLH. |
| 5.4 | If a baseline PLH is available this value is subtracted from the PLH obtained from 5.3. |
| 5.5 | If a baseline PLH is unavailable the PLH in 5.3 is taken as the value from which permanent disability will be calculated. |
| 5.6 | Permanent Disablement is calculated by halving the value of the PLH obtained in either: 5.4 (if a baseline PLH is available) or 5.5 (if a baseline PLH is unavailable). |