Optimized biopsy site shear-wave elastography values for detecting Metavir score F2 or greater were 1.87 m/s ( 75 % sensitivity and specificity ) , 2.00 m/s ( 80 % sensitivity and specificity ) , and 1.89 m/s ( 76 % sensitivity and specificity ) in hepatitis C , nonhepatitis C , and all patients , respectively .