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Frequency with which lung function tests are performed in patients with primary immunodeficiency (PID). 
: Performed at clinic visit; 
: Performed as required; 
: Never performed. P = paediatric patients (eight centres); A = adult patients (nine centres). FEV1 = forced expiratory volume at 1 s; FVC = forced vital capacity; TLCO = transfer factor for carbon monoxide; PEFR = peak expiratory flow rate; FEF 25–75 = the forced expiratory flow at 25–75% of FVC.
