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After talking to the physician you find out her labs. Her labs reveled albumin level of 2.1gm/dL, calcium of 7.8mg/dL, glucose 120mg/dL , sodium 138 mmol/L, phenytoin level of 17.8. Based on the given data which of the following best interprets phenytoin concentration?
Correct Answer: B
Explanation Corrected phenytoin (mg/L) = Observed phenytoin (mg/L) / (0.2 x albumin [g/dL]) + 0.1 = 17.8 / (0.2 x 2.1) + 0.1 = 17.8 / 0.42 + 0.1 = 42.48mg/L phenytoin level is high. Normal therapeutic range is: 10-20mg/dL