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Immunoassay reagents intended to perform quantitative analyses on a body fluid sample (e.g., serum, plasma) to measure levels of total phenytoin (an anticonvulsant agent that is used in a wide variety of seizures; it is also an anti-arrhythmic and a muscle relaxant) present in the sample. Reagents for measuring levels of total phenytoin are used to monitor drug levels in patients undergoing treatment, either to determine the adequacy of treatment or to diagnose a drug overdose or drug-related toxicity.
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