Validation study of related substances method

Dear All,
I have a validation study for related subtances, and I haven’t understand the following:
In a limit test method, some characteristics are not normally evaluated (Linearity, accuracy, precision,LOQ, range), But in in a quantitative method this characteristics are normally evaluated. Can you help me to understand the difference between Limit & Qualitative.

My method provides the area% of the impurity (with one impurity knowed) present in the sample compared to an 0,1% of API std (official limit).

Hope somebody can help me.

Best regards,

It must be quantitative as per ICH Q2R, otherwise you cannot control and set specifications for your Related Substances at release and expiry.

many thanks gokeeffe for your help.

Just to understand can you explain me the difference between Limit & Qualitative method for related subtances.

Best regards,

Dear Sir,

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[/url]Thank you