diagnostic test
diagnostic assay

So your doctor may want you to have a diagnostic test to make sure.

He agreed to take part in a study on an old diagnostic test.

For $999, students get 35 hours of class time, including four diagnostic tests.

She even let me look at the results of diagnostic tests she'd run earlier that morning.

Which blood type does a person have, given the results of various diagnostic tests?

But we have no diagnostic test to predict which ones they are.

Potential students are given a diagnostic test, which helps determine the course of study.

It is not and cannot be a definitive diagnostic test.

What to expect when you need to get additional diagnostic tests.

Additional diagnostic tests focus on children younger than age 3.