29 days
Radioimmunoassay (RIA)
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Measures precursor to angiotensin II. Assesses renin-angiotensin system activity and blood pressure regulation.
Plasma
3 mL
Lavender-top (EDTA) 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.
This test does not require any special collection or pre-analytical handling. Follow routine specimen collection protocols.
| Temperature | Period |
|---|---|
| Frozen | 14 days |
| Freeze/thaw cycles | Stable x3 |