12 days
Liquid chromatography/tandem mass spectrometry (LC/MS-MS)
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Precursor to aldosterone and cortisol. Used in adrenal function testing.
Serum
2 mL
Red-top tube or gel-barrier tube
No special preparation is required for this test. You may eat, drink, and take your medications as normal, unless instructed otherwise by your healthcare provider.
Separate serum from cells within one hour of collection. Transfer specimen to a plastic transport tube before freezing. Store and ship frozen. To avoid delays in turnaround time when requesting multiple tests on frozen samples, please submit separate frozen specimens for each test requested.
| Temperature | Period |
|---|---|
| Room temperature | 3 days |
| Refrigerated | 3 days |
| Frozen | 300 days |
| Freeze/thaw cycles | Stable x3 |