The Ethylene Glycol, Serum by Gas Chromatography-Flame Ionization Detection (GC-FID) test is used to measure the levels of ethylene glycol in the blood. Ethylene glycol is a clear, sweet-smelling liquid used in many industrial applications, but exposure to it can lead to poisoning. This test helps doctors assess cases of ethylene glycol poisoning, as high doses can cause serious health issues such as kidney failure and neurological disturbances. The accuracy of this method is crucial in guiding appropriate treatment, such as the use of antidotes. This test is a vital tool in emergency situations to ensure patient safety.