Screening is not beneficial in women older than 60 years if they have had a history of recent negative tests.

Therefore, a negative test does not always rule out neurosyphilis.

For the most part we found completely negative tests with a very small amount of positives.

A negative test result means that no blood was found in the stool sample during the testing period.

Is it possible to have a "false negative" test result?

His negative test results cause the survivor to believe that she has not been exposed.

Specificity is the chance a person without cancer has a negative test.

Sure enough: on Sunday, we gently raised the subject of all his negative tests.

A negative test indicates that the blood is of maternal origin.

After a few days of negative tests, his doctors decided to send him home.