CPT® Code 80143

The CPT® Code 80143 refers to a laboratory test specifically designed to measure the levels of acetaminophen in the blood. Acetaminophen is widely recognized as one of the most common over-the-counter medications used for pain relief and fever reduction. However, it is also associated with significant health risks, particularly in cases of overdose, which can lead to severe conditions such as toxic hepatitis. The primary purpose of this test is to monitor therapeutic levels of acetaminophen to ensure they remain within a safe range, thereby preventing potential toxicity and assessing the risk of liver damage. Therapeutic drug monitoring is crucial, as levels between 10-20 mcg/mL are considered safe, while levels exceeding 200 mcg/mL, especially when measured four hours post-ingestion, indicate a heightened risk for liver injury. The testing process typically employs immunoassay or enzymatic methods, including advanced techniques like high-performance liquid chromatography with electrochemical detection (HPLC-EC). A venous blood sample is collected separately for this analysis. The serum samples undergo gel filtration and hydrolysis, which facilitates the release of acetaminophen cysteine from acetaminophen-protein adducts. Following this, the protein is precipitated and extracted, and the resulting samples are injected into the HPLC-EC system for analysis. The detection of results is accomplished using a coulometric electrochemical detector, and the final values are reported to provide critical information regarding the patient's acetaminophen levels.