Lithium concentration in serum/plasma
This test measures the amount of lithium, a medication, in your blood. Lithium is often used to treat certain mental health conditions.
["Lithium helps manage mood disorders but must be carefully monitored to avoid side effects."]
Key facts at a glance
- LOINC
- 3719-2
- Short code
- Lithium SerPl-mCnc
- Synonyms
- Lithium SerPl-mCnc
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- 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
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
Why Is This Test Done?
Your healthcare provider may order this test to check if your lithium levels are within a safe range. This is especially important if you’re taking lithium to treat conditions like bipolar disorder or depression. Regular monitoring helps prevent toxicity or inadequate medication levels.
What to Expect Before the Test
No special preparation is needed. You may have a small needle inserted into your arm to draw blood. If you’re on lithium, your provider may ask you to stop taking it temporarily before the test, depending on your situation.
What the Results Mean
Results are compared to a general reference range for lithium in blood. Too much lithium can cause serious health problems, while too little may mean your medication isn’t working as intended. Your provider will discuss these details with you.
Possible Side Effects or Risks
Blood tests are generally safe, but drawing blood can cause mild discomfort or bruising. Rarely, lithium levels that are too high can lead to nausea, confusion, or other symptoms, so it’s important to follow your provider’s instructions carefully.
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 psychiatric conditions. Abnormally high levels can cause toxicity, leading to seizures, kidney damage, or other serious issues. Low levels may indicate poor medication adherence or absorption. Regular monitoring ensures your treatment remains effective and safe.
Short name
Lithium Level
Frequently asked questions
How often should I get this test?
What happens if my lithium level is too high?
Can I drink alcohol before this 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