1. A medical test or procedure performed to identify the nature and cause of a disease or condition
The doctor ordered a diagnostic test to determine the cause of the patient's symptoms.
O médico solicitou um teste diagnóstico para determinar a causa dos sintomas do paciente.
2. An examination or assessment used to identify problems or defects in systems, equipment, or performance
The mechanic ran a diagnostic test on the car's engine.
O mecânico executou um teste diagnóstico no motor do carro.