Hi

We did LDH assay for hepatic cells and we did the calculations using the following formula for the readings.

% Cytotoxicity =

Compound-treated LDH activity – Spontaneous LDH activity× 100

     Maximum LDH activity – Spontaneous LDH activity

We got compound treated LDH  values less than spontaneous LDH activity values.so the final calculation comes in negative.Is this correct ?If not how should we expect the values. 

                                                                                                                                              

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