Meanings of imperfect test in English

Property is indeed but a very imperfect test of intelligence.

And I don't want the results of one imperfect test to propel me into surgery.

This necessity has lead to a reliance on liver biopsy which itself is an imperfect test and poorly accepted by patients.

"You base all this on one imperfect test?"

The design differs from a double sampling design because it compares two imperfect tests instead of combining information from a perfect and imperfect test.