13 days
Liquid chromatography/tandem mass spectrometry (LC/MS-MS)
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Measures aldosterone excretion in a 24-hour urine sample. Assists in diagnosing hyperaldosteronism and related disorders.
24 hour urine
10 mL
Plastic urine container, no preservative.
If patient is taking diuretics, antihypertensive drugs, cyclic progestational agents, estrogen, or licorice, results for aldosterone may not be interpretable. Patient should be on a diet containing 135 mmol (3 g) sodium per day for at least two weeks and preferably 30 days prior to testing. Causes for Rejection Incomplete 24-hour collection, original container with pH <2.
This test does not require any special collection or pre-analytical handling. Follow routine specimen collection protocols.
| Temperature | Period |
|---|---|
| Room temperature | 7 days |
| Refrigerated | 14 days |
| Frozen | 14 days |