Table 1. Expected and calculated cut-offs of lactate dehydrogenase (LDH) isoenzyme levels.

LDH, lactate dehydrogenase; ROC, receiver operating characteristic

Isoenzymes	Peptide structures	Expected proportion	Discriminative cut-off on ROC analysis
LDH1	HHHH (H4)	20%–30%	68.8 (27.7%)
LDH2	HHHM (H3M)	30%–40%	117.65 (47.4%)
LDH3	HHMM (H2M2)	20%–25%	81.72 (32.9%)
LDH4	HMMM (HM3)	7% –15%	40.85 (%16.4%)
LDH5	MMMM (M4)	5%–12%	46.95 (18.9%)