Hyponatremia laboratory findings

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Laboratory Findings

The following laboratory assessments can help in ascertaining the cause of hyponatermia:

• Comprehensive metabolic panel (includes blood sodium)
• Serum osmolality
• Blood urea nitrogen (BUN)/creatinine
• Calcium
• Magnesium
• Urine sodium
• Urine osmolality
• Thyroid stimulating hormone (TSH)
• Serum glucose