Lithium concentration in serum/plasma
This test measures the amount of lithium in your blood, often done to monitor treatment for conditions like bipolar disorder or certain neurological disorders.
["Lithium levels help doctors adjust your medication to avoid side effects or maintain balance."]
Key facts at a glance
- LOINC
- 3721-8
- Short code
- Lithium Ur-mCnc
- Synonyms
- Lithium Ur-mCnc
- Category
- chemistry
- Sample
- urine
- Container
- Sterile urine container
- Units
- N/A
- Ref low
- 0.6
- Ref high
- 1.2
- Critical range
- — – 1.6 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Specimen volume
- 10 mL
- Stability
- Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 4–24 hours
- Order
- routine
Why This Test Matters
Lithium is a medication used to stabilize mood in conditions such as bipolar disorder. Your doctor may order this test to check if your lithium levels are within the safe range. Too much lithium can cause serious health issues, while too little may not be effective.
What to Expect Before the Test
No special preparation is usually needed. You may be asked to fast for a few hours before the test, but this depends on your doctor’s instructions. Bring any medications you’re currently taking to your appointment.
How the Test Works
A healthcare professional will draw blood from a vein in your arm. The blood sample is then sent to a lab to measure lithium levels using a specialized test method.
What the Results Mean
Results will show your lithium concentration in units typically measured per deciliter (e.g., mg/dL). Your doctor will interpret these results in relation to your symptoms and medical history.
Reference range
Therapeutic: 0.6-1.2 mmol/LN/A
No special preparation usually required. Stay well hydrated. Inform your healthcare provider of all medications and supplements you are taking.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Lithium levels are critical for managing mood disorders. Too high can cause toxicity, leading to symptoms like nausea, confusion, or even seizures. Too low may mean your medication isn’t working as intended. Regular monitoring helps prevent these issues.
Short name
Serum/plasma lithium level
Frequently asked questions
How often should I get this test?
What are common side effects of lithium?
Can I drink water before the test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 17, 2026. · Read our editorial policy