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Prior to starting treatment with lithium, laboratory tests are required to establish baseline measures of the functioning of certain body systems. A complete blood count, an electrocardiogram (ECG or EKG), kidney function tests (blood urea nitrogen [BUN], creatinine, and urinalysis), thyroid tests, and tests of calcium and electrolyte levels are required. The ECG (EKG) and the thyroid and calcium tests should also be repeated periodically during treatment. A pregnancy test is optional.
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