For quantitative determination of choline and evaluation of drug effects on choline metabolism. Key Features: Use 20 µ L samples. Linear detection range: colorimetric assay 1 to 100 µ M, fluorimetric assay 0.2 to 10 µ M choline. Method: OD570nm, or FL530/585nm. Samples: Serum, plasma, urine, saliva, milk, tissue, cells etc. Species: All. Procedure: Assay takes 30 min. Kit size: 100 tests. Detection limit: OD, FL: 1, 0.2 µ M.