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Serum Lithium Levels: Ideal Time for Sample Collection! Are We Doing it Right?
Damegunta Swetha Reddy1, M S Reddy1
1Asha Hospital, Hyderabad, Andhra Pradesh, India.
Indian Journal of Psychological Medicine
|July 19, 2014
Summary
For once-daily lithium (OD) dosing, measuring serum lithium levels 24 hours after the last dose provides a more accurate trough level than the traditional 12-hour measurement. This ensures patients receive the correct lithium dosage for bipolar disorder treatment.
Area of Science:
- Pharmacology
- Psychiatry
- Clinical Chemistry
Background:
- Lithium is a primary treatment for bipolar disorders, with efficacy linked to serum levels.
- Current practice often measures lithium trough levels 12 hours post-dose for divided daily regimens.
Purpose of the Study:
- To determine if 12-hour post-dose lithium levels accurately reflect trough levels in patients on once-daily (OD) sustained-release formulations.
- To investigate the optimal timing for measuring serum lithium trough levels in OD dosing regimens.
Main Methods:
- Serum lithium levels were measured at 12 and 24 hours after the last dose in 48 patients on OD lithium.
- Sustained-release lithium preparations were used in the study population.
Main Results:
- Mean serum lithium levels were 0.82 [0.29] at 12 hours and 0.60 [0.20] at 24 hours post-dose.
- Lithium levels at 12 hours were 1.3 times higher than the actual trough levels measured at 24 hours.
Conclusions:
- Measuring serum lithium at 24 hours post-dose is more appropriate for OD administration of sustained-release lithium.
- This 24-hour measurement may prevent underdosing and improve treatment efficacy for bipolar disorder.
