Lithium: normal range and what it means
Monitored when taking lithium medication.
Normal range
Adult reference range.
- Low< 0.6 mmol/L
- Therapeutic0.6 – 1.2 mmol/L
- High≥ 1.2 mmol/L
What it measures
The blood level of lithium in people taking it. The gap between an effective dose and a toxic one is narrow, which is why it is measured rather than assumed.
What moves it
Lithium dose, timing of the last dose, hydration, salt intake and kidney function. Monitored on a strict schedule, usually 12 hours after a dose.
How to bring it into range
Draw twelve hours after the last dose. Dehydration, low salt intake and anti-inflammatory painkillers all push the level up.
How fast it responds
Days.
Also reported as: serum lithium
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Common questions
- What is a normal Lithium level?
- Therapeutic: 0.6 – 1.2 mmol/L. Adult reference range.
- What does a high Lithium mean?
- A value above the reference band means Lithium is outside the range typical for a healthy adult. A single reading is rarely conclusive on its own — what matters is the trend across draws and the other markers around it, which is why HealthOS reads the whole panel together rather than one number at a time.
- How do I improve my Lithium?
- Draw twelve hours after the last dose. Dehydration, low salt intake and anti-inflammatory painkillers all push the level up.
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Reference ranges are general-population guidance compiled from common clinical laboratories, not a diagnosis. Lab-to-lab ranges differ. Always read your results with your doctor.