The phrase "ascertain such" is correct and usable in written English.
It can be used when you want to confirm or determine specific information or details.
Example: "Before proceeding with the project, we need to ascertain such details as the budget and timeline."
Alternatives: "determine such" or "verify such".
Although several reports suggested that Manning would be the highest-paid player in the N.F.L., it is difficult to ascertain such a rank because not all contract money is guaranteed.
Our objective was to ascertain such demand and preferences among the United States general population.
In that respect, accuracy profile represents a very convenient tool to ascertain such a goal.
Consequently, the influence of mud invasion becomes too difficult to ascertain such that high water saturation is estimated from the low-resistivity reading (Souvick 2003).
In order to ascertain such equivalence, MI is to be established by examining the interrelations between items and the scale representing the underlying trait (Chen 2008, p. 1006).
However, an increasingly diverse range of patient cases has led to a situation in which it is impossible to ascertain such aspects of actual practice as prosthesis type and design, making it necessary to reaffirm the importance of treatment carried out from a prosthetic perspective [12].
"Now he's married to a Kennedy, and he says things like 'I ascertained such and such,' " Mr. Mele said.
With the view to ascertaining such a hypothesis, a comparative examination was carried out, based on kinetics.
Ascertaining such truth as best we can is the cognitive means we have available for meeting those ends.
The primary and secondary factors as well as replication patterns need to be ascertained such that the impact of variation among the entities is minimized.
Having ascertained such a global picture we can make consistent predictions for determining basic principles of the functioning of coupled neurons on networks where they receive mixed, inhibitory and excitatory perturbations from other neurons and synergetically reciprocate.
