The Lithium (Eskalith) test monitors lithium levels in the blood, crucial for individuals using lithium carbonate for mood disorders like bipolar disorder. Clinical application involves maintaining therapeutic levels to manage mood stability while avoiding toxicity. Symptoms of lithium toxicity include nausea, tremors, confusion, and seizures. The test guides medication adjustments, optimizing treatment efficacy and minimizing adverse effects. Regular monitoring is essential for personalized mental health care, ensuring the well-being of individuals undergoing lithium therapy for mood disorders.