Case | Previous histamine PD20 µmol | Prechallenge histamine PD20 µmol | Postchallenge histamine PD20 µmol | % Maximum immediate fall in FEV1 | % Maximum late fall in FEV1 | OASYS-2 score |
1 | >8 | >8 | >8 | −45 | −48 | 3.8 |
2 | 1.5 | >8 | >8 | −27¶ | −6¶ | 2.88 |
3 | >8 | Not done | Not done | −14 work challenge | Not done | See text |
4 | >4800 µg methacholine | 125 µg methacholine | 70 µg methacholine | −15 (NCl3) −41 (formaldehyde) | 0 (NCl3) −4.1 (formaldehyde) | 4.00 |