Figure 1From: Is albumin gradient or fluid to serum albumin ratio better than the pleural fluid lactate dehydroginase in the diagnostic of separation of pleural effusion?Receiver Operating Characteristic plots of the pleural fluid FLDH, ALBR, and SEAG. The optimum cut-off level was determined by selecting the points of test values that provided the greatest sum of sensitivity and specificity. The optimum cutoff for FLDH was 163 IU/L, ALBR = 0.68, SEAG = 9.0.Back to article page