Good to knowOne result rarely tells the whole story. Your provider looks at your results together with your symptoms, exam, and other tests.
What the test is
The safe range is narrow. Kidney and thyroid tests are usually checked too.
Why it's done
- Starting or changing lithium
- Regular monitoring
- Signs of toxicity, illness, or dehydration
Getting ready and what happens
- Draw the sample about 12 hours after your last dose (usually before the morning dose).
How the test is done
- A health worker cleans the skin, puts a band around your arm, and draws blood from a vein with a small needle. It takes a few minutes.
What the results mean
| Result | Typical range for adults |
|---|---|
| Usual target | About 0.6 to 1.0 mEq/L for maintenance (your provider sets your target) |
Normal ranges vary from lab to lab and can differ by age, sex, and pregnancy. Your report lists your lab's own range next to each result. A result a little outside the range is often not a problem.
High
Raises the risk of toxicity. Dehydration, NSAIDs, and some blood pressure medicines can raise it.
When a result needs quick action
Call 911Vomiting, diarrhea, severe shakiness, confusion, or trouble walking while on lithium
Questions to ask your provider
- What do my results mean for me?
- Do I need to repeat this test or have other tests?
Risks
A blood draw is very safe. You may have slight pain or a small bruise where the needle went in.
Related conditions
Related medicines
Related tests
Sources
Last updated 2026-11-13.