The phrase "ascertain illness" is correct and usable in written English.
It can be used in medical or healthcare contexts when referring to the process of determining or diagnosing a person's illness.
Example: "The doctor will conduct several tests to ascertain illness before recommending a treatment plan."
Alternatives: "determine illness" or "diagnose illness".
A similar consensus procedure was employed to ascertain illness time course and treatment history.
For all 5 outbreaks, a cohort study was conducted to ascertain illness and exposure information.
Children born May 1994 through December 1998 were followed to 3 or 4.5 years of age to ascertain illness diagnoses.
Also, the registers lack detail to sufficiently ascertain illness severity, so we cannot fully exclude the possibility that our findings reflect when compared to the general population, depressed individuals may present with higher acuity of medical illnesses and a greater burden of comorbidity, necessitating hospitalisation for optimal treatment.
4 Additionally, the validity of the results generally depends on the ability of the caretaker to correctly ascertain the illness of interest and recall events that may have occurred many weeks earlier.
Last, we were unlikely to have accurately ascertained clinical illness associated with H5N1 virus infections because of the lag between collection of H5N1 virus positive poultry and environmental surveillance samples and the collection of follow-up blood samples from workers.
One potential limitation of our study is that the principal studies quantifying the risk of GBS with influenza illness ascertained cases of influenza in different ways.
Scallan et al. concluded that cases of acute diarrheal illness ascertained through laboratory-based public health surveillance are likely to differ systematically from unreported cases and likely over-represent those with bloody diarrhoea and longer diarrhoea duration [ 12]; we concur.
As most cases were interviewed whilst they were still unwell, it was not possible to ascertain the length of illness and hence determine the overall impact of the outbreak on the team and its training goals.
Thyroid function tests should be repeated after recovery from acute illness to ascertain euthyroid status.
Primary thyroid dysfunction can be accompanied by NIT, and a follow-up thyroid function test is essential after recovery from illness to ascertain normalization.
