Lab tests often play a central role in what diagnosis a patient receives. These tests must be tracked and performed appropriately so that the doctors get proper information upon which to make a correct diagnosis. When the lab tests come back with incorrect information, the patients can suffer greatly.
It has recently come to light that labs often misdiagnose cancer in biopsies. No matter which way the error falls, the patient is going to be negatively impacted. A false positive could lead to unnecessary treatments and mental anguish. A false negative could lead to curable cancer advancing to a terminal state.