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Usefulness of saliva lithium estimation
The British Journal of Psychiatry : the Journal of Mental Science
|February 1, 1977
Summary
Saliva can substitute serum for lithium monitoring, showing a high correlation (r=0.88) and good stability. This offers practical advantages for tracking lithium levels in patients.
Area of Science:
- Pharmacology
- Clinical Chemistry
- Biomarker Analysis
Background:
- Lithium is a crucial medication for managing bipolar disorder.
- Therapeutic drug monitoring of lithium is essential to ensure efficacy and minimize toxicity.
- Current monitoring relies on serum lithium level estimations, which can be invasive.
Purpose of the Study:
- To evaluate the correlation between serum and saliva lithium levels.
- To assess the stability of lithium concentrations in saliva over time.
- To determine the feasibility of using saliva as a non-invasive alternative for lithium monitoring.
Main Methods:
- Collected 24 paired serum and saliva samples from patients undergoing lithium therapy.
- Analyzed lithium concentrations using established laboratory methods.
- Assessed saliva lithium stability through serial sampling.
Main Results:
- Demonstrated a very high positive correlation (r = +0.88) between serum and saliva lithium levels.
- Observed lithium ratios in saliva consistent with North American findings.
- Confirmed good stability of saliva lithium levels over various time points.
Conclusions:
- Saliva lithium levels strongly correlate with serum levels, supporting its use in monitoring.
- Saliva offers a stable and non-invasive alternative for lithium level estimation.
- This approach presents significant practical advantages for routine patient management.