Blood samples go to a laboratory where staff members perform tests in chemistry, hematology, microbiology, virology or immunology sections and analyze them for results, states the Yale School of Medicine. Upon completion, laboratory staff review the results and report them to the health care provider.
Each section of the laboratory performs different tasks for a variety of diagnostic purposes, explains the Yale School of Medicine. The chemistry section tests the blood for chemicals and drugs. The hematology section assesses the numbers of blood cells and their ability to function. The microbiology section examines the blood for bacterial, fungal and parasitic infections, while the virology section detects viral infections. The immunology section investigates the state of the individual's immune system and screens for diseases.