diagnose
v.v. to identify a medical condition or a problem after looking at the signs. You use this when a doctor tells you exactly what illness you have.
v. to identify the nature of an illness or other problem by examination of the symptoms. Transitive — requires a direct object, typically the condition or the patient.
The doctor needs more tests to diagnose the illness.
After reviewing the blood results, the specialist was able to diagnose the patient with a rare vitamin deficiency.
While modern imaging technology allows clinicians to diagnose structural abnormalities with high precision, many neurological conditions still require a longitudinal observation of behavioral symptoms to confirm.
Back-formation from diagnosis. Compare also sclerose (verb).
The verb is transitive. When referring to the person, it takes the preposition 'with' ('diagnose him with flu'); when referring to the disease, it takes a direct object ('diagnose flu').
The doctor diagnosed that he has malaria.The doctor diagnosed him with malaria.Diagnose is typically followed by a noun phrase (the patient or the disease), not a 'that' clause.