Reagents for immunoassay systems for the determination of CK-MB: IMMULITE® 1000 CK-MB LKMB, batches # 312, 313, IMMULITE® 1000 Turbo CK-MB LSK, IMMULITE® 2000 XPi CK-MB L2KMB, batches # 213 , 214, 215, IMMULITE 2500 CK-MB L5KCP, lots no. 136, 137