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The following factors can interfere with the test:
- Recent trauma, surgery, or shock
- Consuming large or small amounts of salt or fluid
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Intravenous fluids containing sodium
- Diuretics or certain other medications
Drugs that can increase sodium measurements include anabolic steroids, antibiotics, clonidine, corticosteroids, cough medications, laxatives, methyldopa, nonsteroidal anti-inflammatory drugs (NSAIDs), and birth control pills.
Drugs that can reduce sodium measurements include carbamazepine, diuretics, sulfonylureas, triamterene, and vasopressin.
Veins and arteries vary in size from one patient to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.
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