Here is an assay for LDH that measures and increase in absorbance at 490
rather than a decrease at 340. It is alot more sensitive (about 5-fold in direct
comparison). We monitor the reaction with a kinetic microplate reader from
Molecular Devices. Ironically, we purchased a plate reader that can monitor
absorbance at 340, then found that Molecular Devices had a technical note for
this method.