Table 1

Neurologists (%) requesting respiratory function tests

	Any test (%)	Spirometry (%)		SNIP (%)	P_imax/P_emax (%)	Pulse oximetry (%)	Arterial blood gases (%)	Non-invasive PCO₂ (eg, TOSCA) (%)
	Any test (%)	Sitting	Supine	SNIP (%)	P_imax/P_emax (%)	Pulse oximetry (%)	Arterial blood gases (%)	Non-invasive PCO₂ (eg, TOSCA) (%)
At presentation	38	37	19	6	5	10	4	4
Every clinic visit	20	19	7	4	2	4	2	1
Only if symptomatic	46	40	33	13	4	28	25	8
Every visit or if symptomatic	66	59	40	17	6	32	27	9

SNIP, sniff nasal inspiratory pressure; P_iMax/P_emax, maximum inspiratory and maximum expiratory pressures; TOSCA, transcutaneous PCO₂ with oximetry.