CPT® Code 80179

Salicylate refers to a salt or ester derived from salicylic acid, which is a compound commonly associated with a group of medications known as salicylates. These medications, including aspirin, are utilized primarily for their analgesic (pain-relieving), anti-inflammatory, and antipyretic (fever-reducing) properties. Additionally, salicylates play a role in preventing excessive blood clotting, making them significant in various therapeutic contexts. Testing for salicylate levels is particularly critical in situations where there is suspicion of overdose or ingestion of unknown substances, especially in cases presenting with symptoms of metabolic acidosis. Symptoms indicative of salicylate toxicity may include nausea, hyperventilation, arrhythmias, tinnitus, and vertigo. In more severe cases, particularly in unconscious individuals or children, the ingestion of salicylates can lead to serious health complications such as electrolyte imbalances, low blood glucose levels, dehydration, confusion, hearing loss, convulsions, hallucinations, delirium, and potentially fatal outcomes such as coma or death. The testing process typically employs immunoassay or enzymatic methods, such as fluorescence polarization immunoassay (FPIA), which analyze serum or plasma samples, and occasionally urine samples, to quantify salicylate levels. Results are reported in milligrams per deciliter (mg/dL) or micrograms per milliliter (mcg/mL), with symptoms of toxicity generally manifesting at salicylate concentrations exceeding 10-30 mg/dL or 100-300 mcg/mL. The FPIA technique involves the use of a salicylate-specific antigen labeled with fluorescein, which is introduced to the serum sample and subjected to light irradiation. The reflected light is then analyzed to differentiate between bound and unbound fluorescein, allowing for the quantification of salicylate levels based on the intensity of the reflected signal.