lithium level
Blood test measuring lithium concentration to ensure therapeutic dosing and prevent toxicity.
Full Definition
Lithium level refers to the serum concentration of lithium in the blood, measured to monitor therapeutic effectiveness and prevent toxicity in patients taking lithium for mood stabilization. Therapeutic levels typically range from 0.6-1.2 mEq/L for maintenance treatment, with slightly higher levels (0.8-1.4 mEq/L) sometimes used during acute treatment phases. Levels above 1.5 mEq/L indicate potential toxicity, while levels above 2.0 mEq/L constitute a medical emergency. Regular monitoring is essential due to lithium's narrow therapeutic window and potential for serious adverse effects including kidney and thyroid dysfunction.
Usage
Usage note: Always specify units (mEq/L or mmol/L) and timing relative to last dose when documenting.
In Context
- "The patient's lithium level was 1.3 mEq/L, within the therapeutic range for mood stabilization." — laboratory results interpretation
- "Weekly lithium levels will be monitored during the dose titration period." — medication management plan