This Endocrine Function Test is measured in biological fluids (commonly plasma or urine). Radioimmune assays, immunometric assays or variations are most often used for measurements. Variations are due to pulsitile release, biological rhythyms and nutrition status. It is a static determination.
Within this test, hormones should be measured along with their regulatory factors (i.e. insulin and glucose)
Within this test, the target hormone should be measured with appropriate trophic hormones to determine is an ectopic site, such as a tumor, is causing elevations in hormone.