diagnostic examination; diagnostic test
Medical term for a test or examination performed to diagnose a condition.
The doctor explained the results of the diagnostic test.
検査 is a general examination or inspection, while 診断検査 specifically refers to a test for diagnosis.
診断 is the diagnosis itself, whereas 診断検査 is the examination or test used to reach a diagnosis.
Compound of 診断 (diagnosis) and 検査 (examination).