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What sample is required?

The determination is made from a venous blood sample; in some cases, a urine sample or urine collected over 24 hours.

Is some kind of prior preparation necessary?

For this test you do not need any special preparation.

Why do the analysis?

To determine if the sodium concentration is within normal limits and to help assess electrolyte balance and kidney function; to monitor acute or chronic hypernatremia or hyponatremia (high or low sodium levels).

When to do the analysis?

If there is dehydration or edema; also to monitor some chronic disorders such as high or low blood pressure.

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