There are a number of analysis techniques that can be employed to measure most of these peptides e.g. RIA and ELISA, and the recent development of ‘multiplexing’ techniques has allowed the measurement of a large number of peptides in a single assay.
Construct Definition (and Source):
Any procedure that involves testing or manipulating a sample of blood, urine, or other body substance in a laboratory setting. (NCI)
Schwartz MW, Woods SC, Porte D Jr, Seeley RJ, Baskin DG. Central nervous system control of food intake. Nature. 2000 Apr 6;404(6778):661-71. doi: 10.1038/35007534. PMID: 10766253.