A definitive diagnosis requires laboratory testing of a blood or urine sample.

The agency pays for the collection and testing of the blood and urine samples.

The pilots were requested to provide both blood and urine samples.

Then the volunteers will give blood and urine samples four times in the following three days.

An additional 375 recipients gave blood and urine samples.

Doctors may test blood and urine samples to look for signs of kidney problems.

Last week, a Belgian toxicologist visited the hospital to collect blood and urine samples from the patients.

In 1996 and 1997, researchers took blood and urine samples from more than 3,000 Long Island women.

The blood and urine samples, however, have been retained and could eventually be used to study the effects of other chemicals.

In such cases, the suspect may have to produce a blood or urine sample for analysis.