Which preposition to use with diagnostic

of Occurrences 4%

So, too, will another symptom which is partially diagnostic of the malady, namely, increased heat of body combined with a rapid falling off in flesh, sometimes, indeed, proceeding quickly on to positive emaciation.

in Occurrences 1%

Often it dispels unnecessary anxiety as in a twinkling by its negative indication, and surely it is to be credited with being distinctly diagnostic in those diseases of which it has itself established the 'curve.'"

Which preposition to use with  diagnostic