CPT® Code 80170

The CPT® Code 80170 refers to the laboratory test for measuring gentamicin levels in the blood. Gentamicin is an injectable aminoglycoside antibiotic, commonly known by its brand names such as Garamycin, Cidomycin, or Septopal. This medication is primarily prescribed for the treatment of severe or serious bacterial infections. Due to its potential side effects, which include auditory, vestibular, and renal toxicity, monitoring the blood levels of gentamicin is crucial. The test is designed to assess gentamicin concentrations at various times, specifically at random, peak, and trough intervals. A random sample can be collected at any time, while peak and trough levels are dependent on specific timing related to the administration of the drug. Typically, trough levels are drawn 30 minutes before the next dose of gentamicin, either through intravenous infusion or intramuscular injection. Conversely, peak levels are collected 15 to 30 minutes after the completion of an intravenous infusion or 90 minutes following an intramuscular injection. The blood sample for this test is obtained through a venipuncture, which is a separately reportable procedure. The analysis of the blood serum is conducted using a fluorescence polarization immunoassay, a method that allows for accurate measurement of the drug levels in the bloodstream.