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Neuro/Psych - Priority Sheet
Lithium Therapeutic Level NCLEX Priority Sheet
Lithium level questions test whether the nurse knows the memory range, checks trough timing, and notices toxicity risk from dehydration, sodium shifts, renal impairment, or interacting drugs.
Study aid - not medical advice. Not a clinical decision tool. For NCLEX pharmacology review only.
Priority 1
What to do first
1. Verify whether the lithium level was drawn as a trough, commonly about 12 hours after the last dose.
2. Compare the level with the ordered target and symptoms.
3. Assess hydration, sodium intake, renal function, and medication changes.
Safety
Hold If
Notify the provider and follow protocol if the lithium level is high, the patient has toxicity symptoms, or there is dehydration, severe vomiting/diarrhea, worsening renal function, or neurologic change.
Do not independently change lithium dosing or start electrolyte therapy.
Monitoring
Labs to Watch
Classic NCLEX memory rule: lithium 0.6-1.2 mEq/L for maintenance; toxicity concern around >=1.5 mEq/L.
Current clinical targets vary by phase of therapy, age, tolerability, and prescriber goal. Monitor renal function, sodium, thyroid function, and pregnancy status when applicable.
Review Details
NCLEX Review Notes
Level Timing
NCLEX memory rule: check a lithium trough level about 12 hours after the last dose.
Why it matters: a random level can mislead you. Always interpret the number with timing and symptoms.
NCLEX Trap
Trap: the test gives a number but also says the patient has severe diarrhea and ataxia.
Safer answer: symptoms win. Treat the situation as possible toxicity, hold per protocol, notify the provider, and anticipate repeat level and renal labs as ordered.
Related Pattern
Drug interactions: NSAIDs, ACE inhibitors, ARBs, and diuretics can raise lithium risk in many clinical contexts.
Teaching: do not start OTC NSAIDs or major diet/fluid changes without provider guidance.
Mini Quiz
Question: A lithium level is 1.7 mEq/L and the patient has coarse tremor. What is the priority?
Answer: hold lithium per protocol, assess neuro status and hydration, notify the provider, and anticipate ordered toxicity management.
References
Saunders Comprehensive Review for the NCLEX-RN Examination; Davis's Drug Guide for Nurses; DailyMed lithium carbonate labeling.
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