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Immunoassay reagents intended to perform quantitative analyses on a body fluid sample (e.g., serum, plasma) to measure levels of vancomycin, a tricyclic glycopeptide bactericidal agent, present in the sample. Vancomycin is used in the treatment of gram-positive bacteria and some gram-negative cocci; vancomycin is used in the treatment of severe staphylococcal infections resistant to other antibiotics. Reagents for vancomycin drug level measurement are used to monitor drug levels in patients undergoing treatment, either to determine the adequacy of drug treatment or to diagnose a drug overdose or drug-related toxicity. Typical reference levels in blood, in micrograms per milliliter, are peak 20 to 30, predose (trough) 10, and toxic more than 50.
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