Table 3.

Results of NT‐proBNP measurements for the cardiac and noncardiac groups using 2 assay methods for the UK cohort. The median and interquartile ranges are shown for continuous variables

	Cardiac (n = 22)	Noncardiac (n = 18)	P value
Second‐generation ELISA (pmol/L)
Plasma	849 (590–1500) (n = 20)	73 (33–138) (n = 17)	<0.0001
Pleural fluid	1001 (640–1500) (n = 22)	98 (45–273) (n = 18)	<0.0001
Point‐of‐care test (no. positive/no. negative)
Plasma (n = 34)	15/2	2/15	<0.0001
Pleural fluid (n = 40)	22/0	4/14	<0.0001