NCLEX PN Exam Practice Test Related

Review NCLEX PN Exam Practice Test related questions and content

Which of the following laboratory values requires immediate follow-up?

  • A. phenytoin level of 8 mcg/mL (32 mcmol/L) for a client who is receiving enteral feedings
  • B. digoxin level of 1.3 ng/mL (1.7 nmol/L) for a client who has a heart rate of 62/min
  • C. lithium level of 0.8 mEq/L (0.8 mmol/L) for a client who is reporting a decreased appetite
  • D. International normalized ratio (INR) of 3 for a client who has a prosthetic aortic valve
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.