the honest summary is that a certificate tells you

one decimal versus two is usually just house style, not precision

i was wrong about this for a year: area percent under-reports nothing, it just answers a different question than assay does

the related substances table is the interesting part. a row of "not detected" means they did not look hard

check the lot

how do you verify a certificate is actually from the lab it says

is area percent the same thing as how many mg are in the vial

the paperwork can be perfect and the vial can still be light. weigh it

tfa counterion runs higher by mass than acetate. if the certificate does not say, you cannot do the mass balance

the retention time on this one is different from the last lot, problem

an identical chromatogram on two different lots is the single biggest tell there is

a certificate should name the method, the instrument, the column and the operator. most name none of those