The Leptin test (Leptin, Serum by Tandem Mass Spectrometry - LC-MS/MS) is used to measure the concentration of leptin, a hormone primarily produced by adipose (fat) cells, which plays a key role in regulating appetite and energy balance in the body. Leptin is an important marker for body fat levels, as it is closely associated with obesity and metabolic disorders. The test is performed by drawing a blood sample, which is then analyzed using tandem mass spectrometry (LC-MS/MS) to provide precise measurements of leptin levels. This test helps doctors assess conditions such as obesity, metabolic disorders, and other related health issues. It can also be used to monitor the response to treatment or lifestyle changes. The results are an important tool for understanding the relationship between leptin and metabolic processes, as well as its impact on overall health.