NABP Exam NAPLEX Topic 7 Question 26 Discussion

Actual exam question for NABP's NAPLEX exam

Question #: 26
Topic #: 7

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?

APhenytoin level is with normal limits

BPhenytoin level is too high

CPhenytoin level is too low

DPhenytoin level cannot be determined

EPhenytoin level need to be repeated

Show Suggested Answer

Suggested Answer: B

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

by Bobbye at May 09, 2022, 01:50 PM

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