Lithium Level Test
Lithium Level Test is a laboratory test you can order directly. A lithium level test measures how much lithium is in your blood. It is ordered to check that lithium, a medicine used to treat some mood conditions, stays in a safe range and to help guide dose adjustments.
- Sample type
- blood
- Category
- General Wellness
- Turnaround
- 1-3 business days
- Price
- $45
- Referral
- Not required
A lithium level test measures how much lithium is in your blood. It is ordered to check that lithium, a medicine used to treat some mood conditions, stays in a safe range and to help guide dose adjustments.
What it measures
- Lithium concentration — The amount of lithium in your blood at the time of the draw.
- Therapeutic range — The range where lithium is most likely to work and be safer for most people.
- Trough level — A level drawn 8 to 12 hours after your last dose, when timing matters.
- Toxic level — A level above the usual range, which needs prompt medical attention.
Who it is for
It is typically ordered by a prescribing clinician for people taking lithium, especially when starting, changing dose, or having side effects.
Preparation
No fasting is needed. Timing matters: most levels are drawn 8 to 12 hours after your last dose, so follow your clinician's instructions on when to take your dose.
Results and what they mean
Results are reported as a number, often with the reference range. Your clinician compares the number with your dose, symptoms, and other labs; this is general information, not medical advice, and only your clinician can interpret your result.
How to order this test
- Choose the test and place a confidential order online.
- Select a certified collection site and pick a time that suits you.
- Have your specimen collected — most draws take only a few minutes.
- Review results in a secure portal, typically within 1–3 days.
Preparation, hours, and pricing vary by site; confirm details directly with the lab before your visit.
Availability by state
Direct-access online ordering for the lithium level test is available in most states. It is currently unavailable in 6 states:
Everywhere else you can order confidentially and collect your sample at a certified site. Browse by state →
Frequently asked questions
Do I need to fast?
No. Fasting is not required for a lithium level.
When should I take my dose before the test?
Ask your clinician. Many levels are drawn 8 to 12 hours after the last dose, so the timing of your dose matters.
What if my level is outside the range?
Do not change your dose on your own. Contact your clinician, who will decide what, if anything, needs to change.
Can other medicines affect the result?
Yes. Some medicines and dehydration can affect lithium levels, so tell your clinician about everything you take.