Determination of lithium levels in the blood is used to monitor treatment for bipolar disorder. This test helps maintain the therapeutic concentration of the medication and prevent toxicity. It is performed regularly as prescribed by a physician.
A blood test for lithium is a laboratory test that determines the concentration of the medication lithium in the blood. Lithium is a mood stabilizer, i.e., a medication that stabilizes mood, and is widely used to treat bipolar disorder (formerly known as manic-depressive psychosis). Maintaining a specific lithium concentration in the blood is critical for achieving a therapeutic effect and avoiding adverse effects.
Lithium testing is prescribed exclusively for patients receiving lithium therapy for:
- monitoring the therapeutic concentration. Lithium has a narrow therapeutic range, meaning that the difference between an effective dose and a dose that may cause toxicity is small. Regular monitoring of blood lithium levels allows the physician to maintain the optimal drug concentration required to control the symptoms of bipolar disorder (manic and depressive episodes) and prevent their occurrence;
- monitoring compliance (treatment adherence). Regular measurements of lithium levels can help the physician assess how closely the patient follows the prescribed treatment regimen. Low levels may indicate irregular medication use or an insufficient dose;
- detecting and preventing toxicity. Excessively high blood lithium levels can lead to significant adverse effects, including nausea, vomiting, diarrhea, tremor, muscle weakness, dizziness, impaired coordination, confusion, seizures, and even coma. Regular monitoring makes it possible to detect elevated lithium levels in a timely manner and take the necessary measures to prevent toxicity;
- dose adjustment. Depending on the test results and the patient's clinical condition, the physician may adjust the drug dose to achieve the optimal therapeutic effect and minimize the risk of adverse effects;
- monitoring changes in the patient's condition or concomitant treatment. Certain health conditions (e.g., dehydration or impaired renal function) or the use of certain medications may affect blood lithium levels. In such cases, more frequent monitoring may be required.
