"Most lab experiments require equipment, like test tubes or 96-well assay ... the scientists added a chemical that changes colors when it reacts with iron in blood. They also successfully grew ...

is an endless stream of blood. If one of the tubes is yours, you have probably run out of options—except for the last gamble of a clinical trial. The Covance laboratory, in the leafy Glen Chapel ...

Using smaller blood tubes decreases the amount of blood collected, does not appear to affect laboratory test results, and reduces the amount of blood drawn overall, according to a new study.