For quantitative determination of creatine kinase (CK) activity and evaluation of drug effects on CK activity. Key Features: Sensitive and accurate. Detection range: 5 to 300 U/L creatine kinase in 96-well plate assay. Convenient. The procedure involves adding a single working reagent, and reading the optical density at 20 min and 40 min at room temperature or 37° C. High-throughput. Can be readily automated as a high-throughput 96-well plate assay for thousands of samples per day. Method: OD340nm. Samples: Serum, plasma etc. Species: All. Procedure: Assay takes 40 min. Kit size: 100 tests. Detection limit: 5 U/L.