Testing follows the European Pharmacopoeia monograph applicable to the substance or finished product: identification, purity tests, assay, and where relevant uniformity of mass, dissolution or specified impurities.
How far the testing goes depends on the monograph used and the number of tests to be run, some of which require incubation or dissolution stages.
We help determine which monograph applies and how far the testing usefully needs to go, given what you are trying to demonstrate.