Determination of lactate dehydrogenase isoenzyme-X (LDH-X) isoenzyme activity
LDH-X activity is an indicator of the testicular function (Foster, Blackburn, Moore, & Lloyd, 1986), and can be analyzed spectrophotometrically at 340 nm by determination of NADH formation using DL- α Hydroxycaproic Acid (LDH-X isoenzyme-specific substrate (Cheever, Weigel, Richards, Lal, & Plotnick, 1985).