Salt-loaded (120 meq Na+/d for 3–4 days):
Supine: 3–10 ng/dL
Upright: 5–30 ng/dL
Salt-depleted (10 meg Na+/d for 3–4 days):
Supine: 12–36 ng/dL
Upright: 17–137 ng/dL
Early AM fasting specimen. Separate immediately and freeze.
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