| pft_bdr | Bronchodilator response per the ERS/ATS 2022 criterion |
| pft_bdr_2005 | Bronchodilator response per the Pellegrino 2005 standard |
| pft_change | Conditional change score for serial PFT measurements |
| pft_classify | Classify ATS spirometry patterns from spirometry and lung-volume measurements |
| pft_diffusion | Compute carbon monoxide diffusion capacity or transfer factor reference values for given demographics |
| pft_diffusion_interpret | Classify a diffusion result into a clinical pattern category |
| pft_dlco_hb_correct | Adjust a measured DLCO / TLCO for the patient's hemoglobin |
| pft_example | Synthetic example PFT cohort |
| pft_fev1q | FEV1Q: ratio of FEV1 to a sex-specific survivable lower limit |
| pft_gold | Grade COPD severity by GOLD criteria |
| pft_interpret | Comprehensive ERS/ATS 2022 PFT interpretation in one call |
| pft_long | Pivot a 'pft_result' to long form |
| pft_plot | Clinical visualisation for a single PFT result |
| pft_prism | Screen for Preserved Ratio Impaired Spirometry (PRISm) |
| pft_quality | Grade spirometry quality per ATS/ERS 2019 |
| pft_severity | Grade severity of lung function impairment from a z-score |
| pft_severity_2005 | Severity grading per the Pellegrino 2005 standard |
| pft_spirometry | Compute spirometry reference values for given demographics |
| pft_volumes | Compute lung volume reference values for given demographics |
| pft_volume_subpattern | Classify lung-volume sub-pattern per Stanojevic 2022 Figure 10 |