"ascertained the impact" is correct and usable in written English.
You can use it to describe the process of determining the effect or influence of something. For example, "The researchers ascertained the impact the new policy would have on the local economy."
Current systematized evidence has not fully ascertained the impact of CHG-WC in bacteremia within the ICU.
Given the wide variety of lower urinary tract symptoms caused by benign prostatic hyperplasia, we ascertained the impact on quality of life for 5 domains of benign prostatic hyperplasia/lower urinary tract symptoms progression.
This study ascertained the impact between and among instructional supervisory behavior, teachers' trust to instructional supervisors, teachers' emotional exhaustion, need to evaluate and teachers' want to have an upward evaluation.
However, none of those studies ascertained the impact of BMI on insulin dose requirements.
However, neither of the studies ascertained the impact on subsequent testing behaviour.
Unfortunately, data on the number of cultures taken during the study were not routinely collected to ascertain the impact of this aspect of clinical practice on case ascertainment.
Like Chapman, she says the mosque's planning application was riddled with errors, including a wild underestimation of the parking required for the site, and no attempt to ascertain the impact of the building on local flora and fauna.
Despite the changes plastic has made to the way we conduct transactions, few rigorous studies have been done to ascertain the impact the medium has had on our spending habits.
A former principal and fellow of the Centre for Policy Development, Chris Bonnor, said with Gonski funding only rolled out from 2014, it was still too early to ascertain the impact the funding was having on the schools the money was supposed to target; under-performing and under-resourced ones.
In a remarkable evocation of the secretive ways and hidden priorities of the cold war, Britain's Atomic Energy Agency acknowledged today that thousands of bones were taken from dead babies without parental consent to help ascertain the impact of atmospheric nuclear testing.
From this figure alone, it is not possible to ascertain the impact on the object.
