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Results of NT‐proBNP measurements for the cardiac and noncardiac groups using 2 assay methods for the US cohort. The median and interquartile ranges are shown for continuous variables
| Cardiac (n = 21) | Noncardiac (n = 17) | P value | |
|---|---|---|---|
| Second‐generation ELISA (pmol/L) | |||
| Plasma | 1500 (790–1500) | 58 (31–174.5) | <0.0001 |
| Pleural fluid | 1500 (918–1500) | 108 (56–324.5) | <0.0001 |
| Point‐of‐care test (no. positive/no. negative) | |||
| Plasma (n = 37) | 20/1 | 2/14 | <0.0001 |
| Pleural fluid | 21/0 | 6/11 | <0.0001 |
