SJH Nursing Officer - 2019
Pharmacology
Easy
The normal value of serum lithium test is:?
Appeared in: SJH Nursing Officer - 2019
Explanation
- The standard therapeutic range for maintenance therapy with lithium is 0.6 to 1.2 mmol/L.
- Lithium has a narrow therapeutic index, meaning the margin between effective and toxic doses is very small, necessitating regular blood monitoring.
- This range balances clinical efficacy in preventing mood episodes with the risk of adverse effects and toxicity.
- Blood levels are typically measured 12 hours after the last dose to ensure an accurate trough level reading.
Why Other Options Were Wrong
- Option B: This range (0.10 - 3.2 mmol/L) is far too broad. Levels above 1.5 mmol/L are considered toxic, and 3.2 mmol/L is a life-threatening level.
- Option C: This range (1 - 1.8 mmol/L) is too high for routine maintenance. While the lower end (1.0 mmol/L) is acceptable for acute mania, levels above 1.2 mmol/L increase the risk of toxicity, and 1.8 mmol/L is clearly in the toxic range.
- Option D: This range (1.2 - 2.2 mmol/L) falls entirely within the toxic zone. Levels above 1.2 mmol/L are associated with adverse effects, and levels above 2.0 mmol/L can cause severe, potentially irreversible, neurological damage or death.
Related Visual
Clinical Relevance
- Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Therapeutic Drug Monitoring: Serum Lithium Levels as background academic context rather than a clinical decision trigger.
- A primary nursing responsibility is to educate patients on the critical importance of adhering to prescribed doses and attending regular appointments for blood level monitoring.
- Nurses must be vigilant in assessing for early signs of lithium toxicity, such as increased tremor, nausea, or muscle weakness, as prompt intervention can prevent severe complications.
- Patient teaching should emphasize maintaining consistent fluid (2-3 L/day) and sodium intake, as dehydration or a low-sodium diet can dangerously increase lithium levels.
How to Approach the Question
- First, identify the core of the question, which is asking for the 'normal value' or therapeutic range of a specific medication: serum lithium.
- This is a factual recall question. Access your knowledge base regarding psychotropic medications and their therapeutic drug monitoring parameters.
- Recall that lithium has a very narrow therapeutic index, meaning its safe and effective range is small.
- Evaluate the given options. The range of 0.6-1.2 mmol/L is the standard textbook value for maintenance therapy.
- Eliminate the other options by recognizing them as either too broad or falling into the toxic range (levels greater than 1.5 mmol/L).
Concept Tested & Keywords
- Concept Tested: Therapeutic Drug Monitoring: Serum Lithium Levels
- Stem keywords: serum lithium test, normal value
- Lead-in keywords: BEST, MOST RELEVANT CLUE
- Negative lead-in flag: false
Question ID
Q3ppT3tT4YH0M5AMua2KM1
Reference Book
E6 Kaplan Sadock's Synopsis of Psychiatry-2022 (pp 1-3768 of 3768) pp. 2065-2067, 2064-2066
E6 Robert Boland, Marcia L. Verduin - Kaplan and Sadock's Comprehensive Text of Psychiatry-Wolters Kluwer Health (2024) (pp 1-16525 of 16525) p. 3494-3496
Practise the full SJH Nursing Officer - 2019
Attempt every question from this paper in a timed mock, then review the full solution for each one.
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