Sodium Test
The sodium test measures the concentration of sodium in a blood sample. Quest describes this measurement as useful in the evaluation of conditions involving electrolyte imbalance, including aldosteronism, diabetes insipidus, adrenal hypertension, Addison's disease, dehydration and inappropriate antidiuretic hormone secretion.
About this test
Sodium is a key electrolyte, and Quest's description ties this measurement to several conditions where electrolyte balance is disrupted: aldosteronism, diabetes insipidus, adrenal hypertension, Addison's disease, dehydration, inappropriate antidiuretic hormone secretion, and other diseases involving electrolyte imbalance. The test uses a 1 mL serum sample, analyzed by an ion selective electrode method.
Who might consider this test?
- Often being evaluated for symptoms that could relate to fluid balance
- Blood pressure regulation or adrenal function
- Are having a known condition monitored over time
Test details
| Quest code | 836 |
|---|---|
| Methodology | Ion Selective Electrode |
| Sample type | 1 mL serum |
| Collection | Quest patient service center |
Reference range
135-146 mmol/L
Reference ranges are general guidance. The range printed on your own laboratory report is the one that applies to your result.
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Quest resources
Additional details
What this test looks at
The test reports one value: the concentration of sodium in serum. Quest lists its usefulness broadly, across conditions from adrenal and pituitary disorders to dehydration, rather than pointing to a single diagnosis, which is why sodium is typically ordered as part of a broader evaluation.
Order online and a physician order is included — no doctor's visit and no insurance needed. Your sample is collected at a Quest Diagnostics patient service center.
Laboratory results should always be interpreted by a licensed clinician who knows your health history. This page is information about a test, not medical advice.
Frequently asked questions
What does the sodium test measure?
It measures the concentration of sodium in a serum sample, using an ion selective electrode method.
How is the sample collected?
The test uses a 1 mL serum sample from a routine blood draw.
Do I need to prepare for this test?
No preparation instructions are listed for this test, though people follow any instructions their ordering clinician provides.
What conditions is a sodium test used to evaluate?
Quest lists aldosteronism, diabetes insipidus, adrenal hypertension, Addison's disease, dehydration, inappropriate antidiuretic hormone secretion and other diseases involving electrolyte imbalance.
Can a sodium result diagnose a condition by itself?
No. Quest ties the measurement to several distinct conditions rather than one; a clinician interprets it alongside symptoms, history and other results.
How much is a Sodium test?
$15, paid once at checkout. The price includes the physician's order this test requires and sample collection at a Quest patient service center.