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The clinical test for sodium is a blood test that measures the amount of sodium in the blood. It is usually done as part of a routine blood test or when a doctor suspects that a patient may have a sodium imbalance. The test measures the amount of sodium in the serum, which is the liquid part of the blood.
To obtain a sample of serum for the sodium test, a healthcare provider will draw a sample of blood from the patient's arm. The sample is then sent to a laboratory for analysis. In the laboratory, the sample is centrifuged to separate the serum from the other components of the blood. The serum is then tested for sodium levels using a chemical reaction. The results of the test are reported as millimoles per liter (mmol/L).
All of the following must be considered when interpreting clinical findings and are too extensive to be covered on this site: