NCLEX PN Exam Practice Test Practice Question
Scenario/Extract:
Medication monitoring therapeutic ranges
Phenytoin
10-20 mcg/mL
(40-79 mcmol/L)
Digoxin
0.8-2 ng/mL
(1.02-2.56 nmol/L)
INR (prosthetic valve)
3-4
Lithium
0.8-1.2mEq/L
(0.8-1.2 mmol/L)
Which of the following laboratory values requires immediate follow-up?
Correct Answer: A
Rationale: Phenytoin levels of 8 mcg/mL are subtherapeutic (therapeutic range: 10-20 mcg/mL), especially with enteral feedings that reduce absorption, requiring immediate adjustment.
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