As a result, the test does not detect the disease early, when treatment should begin.

The window period is the time from infection until a test can detect any change.

The test may simply have detected antibodies passed from the mother to the child.

Sometimes, cancer is located in a place where standard tests cannot detect it.

A test, he said, detected the presence of narcotics on both the money and the bags.

One problem is that many tests detect only a single type of modified grain.

This test does not detect the presence of cancer or polyps.

If a second test detects continued drug use, the worker must be dismissed.

The test is very sensitive and can detect tiny traces even in old samples.

The new experimental test can frequently, though not always, detect the infection soon after birth.