The phrase "a diagnostic entity" is correct and usable in written English.
It can be used in contexts related to medicine, psychology, or any field where a specific condition or classification is being identified or described.
Example: "In the study, we identified a diagnostic entity that could help clinicians better understand the patient's condition."
Alternatives: "a diagnostic classification" or "a diagnostic category".
It is argued that the establishment of CG as a diagnostic entity is essential because its symptoms are associated with enduring mental and physical health morbidity and require specifically designed clinical interventions.
This is likely to be unhelpful to the progress of psychiatric knowledge, given that it is emerging as a diagnostic entity that receives strong research support.
Whiplash associated disorders (WAD) have been studied mainly in comparison to asymptomatic subjects and it remains controversial whether WAD represent a diagnostic entity different from chronic neck pain.
Clinicians should be aware of this as a diagnostic entity, aided by the radiographic findings outlined above as well as the developement of rapidly progressive pulmonary arterial hypertension.
Linked with the uncertain status of MCI as a diagnostic entity, many research participants had questions concerning the extent to which MCI represented a "real" problem.
The term 'signs of nerve root involvement' should be considered a label given to patients fulfilling these criteria rather than a definition of a diagnostic entity.
Depression, which is considered part of a psychological distress continuum or a discrete diagnostic entity, is a highly prevalent disorder in the entire adult population [ 23].
Natural killer-T (NK-T) cell lymphoma, previously categorized as a lethal granuloma, is now a definitive diagnostic entity in the World Health Organization lymphoma classification [ 1].
Another study based on data from a Canadian clinic used latent class models to categorize reported symptoms from a survey, and suggested that a single diagnostic entity could replace the separate diagnostic criteria used to define fibromyalgia, IBS, depression and chronic fatigue syndrome [ 8].
However, an alternative explanation is that a distinct diagnostic entity exists, namely idiopathic cough [ 4].
We conclude by suggesting that hypothesis-free and hypothesis-driven are not mutually exclusive strategies and may provide information at different levels that are both useful and equally valid about genetic risk for a complex diagnostic entity like schizophrenia and for a complex phenotype like psychosis.
