The phrase "ascertained after" is correct and usable in written English.
It can be used when referring to information or conclusions that are determined or discovered following a specific event or process.
Example: "The results were ascertained after the completion of the experiment."
Alternatives: "determined following" or "established after".
It was ascertained, after a number of tests, that Harvard crimson is a bit on the purple side of red.
At first, investigators thought the origin was suspicious, but on Tuesday Chief Fire Marshal Louis Garcia said demolition workers might have been using acetylene torches, and the cause was listed as "not ascertained" after a lengthy investigation, Mr. Garcia said.
It was ascertained after a lot of detective work by a field epidemiologist in the Dept. of Health, that all had been infected by a contaminated batch of heroin - they were all addicted to the drug and the woman who sold it to them had cut it with something - possibly a pinch of dust.
It found that they had illegally "seized" Santos when she tried to get up from her bench and walk away and that they did not have the right to arrest her merely because they had ascertained, after questioning her while she sat eating a sandwich in a public park, that she was facing a federal deportation order as an illegal immigrant.
I blocked the so-called preliminary production, that is, the chemical supplies for the making of gas, so that the gas production, as the Allied authorities themselves ascertained, after the end of December or the beginning of January, actually slowed down and finally came to a standstill.
All families were ascertained after initial consultation with a proband with BD (using the Family Interview for Genetic Studies FIGSS).
(2) If FNS ascertains after warning a State agency as provided in paragraph (h)(1) of this section, that the State agency does not plan to comply with a directive to reduce, suspend or cancel allotments, a court injunction may be sought to compel compliance.
Patient preference for a telephone-based or Internet-based system can be definitively ascertained only after patients use both systems.
5 This introduces potential distortion into the research literature if samples include children ascertained only after clinical referral.
To confirm the lethal effect of OC for promastigotes, treated and untreated parasites (from the growth kinetics study) were washed and resuspended in fresh medium and their viability was ascertained microscopically after 96 h of incubation.
Whereas the first condition may apply in some LIS patients, irreversibility cannot be ascertained until, after rehabilitation, their SWB has reached a steady state, which may take as long as a year.
