| Absolute necessity in all patients | 9 | Pre-bronchodilator FEV1 as a percent of predictedPre-bronchodilator FVC as a percent of predicted |
| | |
| Facility must be available | 8 | Peak flow monitoring and plotting of results |
| OASYS 2 analysis of peak flow records |
| Non-specific provocation challenge in the laboratory |
| Specific IgE to a wide variety of occupational allergens |
| | |
| Facility must be available | 7 | Carbon monoxide transfer factor (Tlco) |
| Transfer coefficient (Kco) |
| Non-specific challenge serially at work and away from work |
| Specific occupational challenge in the clinical laboratory |
| Chest radiography |
| Total IgE |
| Skin prick testing to common environmental allergens |
| Workplace visit by a clinician |
| Workplace challenge with peak flow monitoring/spirometry |
| Standard haematology/biochemistry (FBC, U&E, liver function, thyroid function, calcium) |
| Access to a toxicology database |
| Specific IgE testing to common environmental allergens |
| | |
| May be useful but not a necessity | 6–4 | Measurement of workplace exposure levels |
| Assessment of vocal cord dysfunction |
| Portable lung function logging device |
| Standardised occupational history form |
| Training in occupational medicine to at least Dip Occ Med |
| Total lung capacity |
| | |
| Not routinely required | 3 | Sputum eosinophils |
| | |
| Not routinely required | 2 | Exhaled nitric oxide |
| Expired carbon monoxide |
| Exhaled breath condensate for analysis of inflammatory markers |