Doctor Yeh says tests with human blood can produce the wrong results, so they are not dependable.

VOA: special.2009.08.03

In developed countries, microbiologists do these tests with blood from wool sheep or horses.

VOA: special.2009.08.03

The first question has to do with our recent discussion of English language tests.

VOA: special.2009.01.15

After their first tests, the researchers cleaned the water system with chlorine dioxide.

VOA: special.2011.04.06

Doctors can collect it with a needle. But people who donate marrow must first have tests to make sure they are a good match for the patient.

VOA: special.2009.12.16

They may teach undergraduates,grade papers and tests, and assist with research.

VOA: special.2009.02.19

These tests,along with mammography for breast cancer, help detect cancers at very early stages and increase chances of survival.

VOA: standard.2010.03.25

A spokesman for the group says CT scans are frequently used in hospital emergency rooms because the results can be read quicker than with other tests, like ultrasound or MRIs, that do not use radiation.

VOA: standard.2010.01.30