The phrase "ascertained from all" is correct and usable in written English.
It can be used when discussing information or conclusions that have been determined based on input or data from all relevant sources.
Example: "The results of the study were ascertained from all available data, ensuring a comprehensive analysis."
Alternatives: "determined from all" or "established from all".
A detailed history was ascertained from all patients.
Cases were ascertained from all hospitals in the seven-county metropolitan area of the Twin Cities (Minneapolis and St Paul), Minnesota, and the Mayo Clinic (only cases residing in The Upper Midwest were recruited from the Mayo Clinic).
To investigate the efficiency for the post-exposure treatment of rabies, 244 rabies patients with their detailed medical records of anti-rabies treatment of injuries or related incidents, enrolled at Guangdong province in the years of 2003 and 2004, were ascertained from all of the reported rabies cases (441 patients) during the periods.
Information on place of delivery was ascertained from mothers for all live births in the three years preceding the survey.
The data were ascertained from birth certificates from all hospitals and birth centers in the state.
Tumor size was ascertained from pathology review of all H&E slides collected from all surgeries at diagnosis, when not documented in the pathology report (7% of reports).
EUROCAT member registries collect data, ascertained from multiple sources, on all major structural congenital and chromosomal anomalies: the prevalence rate of all anomalies, excluding chromosomal anomalies, is 219.70 per 10000 births, and the rate of neural tube defects (NTDs: anencephalus and similar, spina bifida, encephalocele) is 9.32 per 10000 births (2007 2011).
The cases from the three study populations were all ascertained from regional population-based cancer registries [ 3- 6, 12], although some patients were not available for the analyses.
All were ascertained from the general population and shown to be comparable to age-matched population singletons.
Data is continuously ascertained from different PHC centres, which all used the same questionnaires and were automatically transferred to SHCR.
Parkinson's disease cases were ascertained from the computerized Danish Hospital Register, with all hospitalizations with Parkinson's disease diagnoses registered since 1977 and all clinic visits, including outpatient clinics, since 1995.
