Abstaining from food or fluids (except water) for a specified amount of time before the collection of a specimen.
Fasting
The state in which the body systems are functioning normally and the internal enviornment of the body is in equilibrium.
Homeostasis
Occurring in the living body or organism.
In vivo
The clinical analysis and study of materials, fluids, or tissues obtained from patients to assist in diagnosing and treating disease.
Laboratory test
A certain established and acceptable parameter or reference range within which the laboratory test results of a healthy individual are expected to fall.
Normal range
The liquid part of the blood, consisting of a clear, yellowish fluid that makes up approximately 55% of the blood volume.
Plasma
A number of laboratory tests providing related or complementary information used to determine the health of the patient.
Profile
The application of methods to ensure that test results are reliable and valid and errors are detected and eliminated.
Quality control
Laboratory test performed routinely on apparently healthy patients to assist in the early detection of disease.
Routine test
The clear, straw-colored part of blood (plasma) that remains after the solid elements and the clotting factor fibrinogen have been separated out of it.
Serum
A small sample of something taken to show the nature of the whole.