What analyte is monitored in treatment of manic-depressive, or bipolar, mental disorders?

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Multiple Choice

What analyte is monitored in treatment of manic-depressive, or bipolar, mental disorders?

Lithium is monitored because it has a very narrow therapeutic index, so its blood level must be kept in a precise range to be effective without causing toxicity. Regular serum lithium measurements guide dosing and ensure safety as levels can shift with changes in hydration, electrolyte balance (especially sodium), kidney function, and drug interactions. Typical maintenance levels sit around 0.6–1.2 mEq/L, with higher targets sometimes used for acute mania. Because lithium is cleared by the kidneys, clinicians also routinely check kidney function and thyroid function, since long-term use can affect both. Other mood stabilizers like valproate, carbamazepine, or lamotrigine have their own monitoring needs, but the hallmark practice in bipolar therapy is measuring lithium levels to balance efficacy and toxicity.

Lithium is monitored because it has a very narrow therapeutic index, so its blood level must be kept in a precise range to be effective without causing toxicity. Regular serum lithium measurements guide dosing and ensure safety as levels can shift with changes in hydration, electrolyte balance (especially sodium), kidney function, and drug interactions. Typical maintenance levels sit around 0.6–1.2 mEq/L, with higher targets sometimes used for acute mania. Because lithium is cleared by the kidneys, clinicians also routinely check kidney function and thyroid function, since long-term use can affect both. Other mood stabilizers like valproate, carbamazepine, or lamotrigine have their own monitoring needs, but the hallmark practice in bipolar therapy is measuring lithium levels to balance efficacy and toxicity.

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