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  • Title: Comparison of urine and serum testing for early detection of acetaminophen ingestion.
    Author: MacDaniel J, Bebarta VS, Schwertner HA, Martin JF.
    Journal: Mil Med; 2007 Apr; 172(4):399-401. PubMed ID: 17484311.
    Abstract:
    Acetaminophen is a common ingestant that is routinely screened for, with serum testing, after overdoses. We compared a modified, qualitative, colorimetric, o-cresol urine test for acetaminophen with the standard laboratory serum immunoassay. Twenty-nine adult volunteers were given 975 mg of acetaminophen, and then serum and urine samples were tested at predefined intervals for up to 4 hours. The presence of acetaminophen in the urine samples was determined with a modified o-cresol assay by two independent reviewers and was verified by using high-performance liquid chromatography. Compared with the acetaminophen serum immunoassay, the acetaminophen urine test had specificity of 97% (95% confidence interval, 80-100%) and sensitivity of 100% (95% confidence interval, 81-100%) at 45 minutes. Further studies to improve and to accelerate processing of the qualitative colorimetric o-cresol urine test could allow the test to be used in specific military and civilian clinical scenarios.
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