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This study showed that in the presence of hypoalbuminemia, high unbound VPA concentrations can be observed despite normal or low total VPA concentrations. It also demonstrated that high unbound VPA concentrations are associated with clinically significant neurologic adverse symptoms. Clinicians should be aware that unbound VPA concentration monitoring may be required in the presence of hypoalbuminemia.
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Doré et al. (2017) studied this question.
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