Figure 2From: Blood ammonia levels in liver cirrhosis: a clue for the presence of portosystemic collateral veins Comparison of ROC curves using as classification variable the presence of Collaterals. NH4, Ammonia; PLTs, Platelets count; SLD, Spleen Longitudinal Diameter; NH4 cut-off (42 mcM/L) had sensibility of 92% and specificity of 60%, with 8% of false negative results; CI, Confidence Intervals.Back to article page