Approximately 1-2% of individuals with primary hypertension have primary hyperaldosteronism characterized by hypokalemia (low potassium) and low direct renin. Because serum aldosterone concentrations vary due to dietary sodium intake and body position, some physicians prefer measurement of 24-hour urine concentrations for aldosterone.
1.0 mL Plasma from a Lavender Top Tube - EDTA in a Plastic Vial
1.0 mL Serum from a Red Top Tube in a Plastic Vial
or
1.0 mL Plasma from a Green Top Tube - Na Heparin in a Plastic Vial
or
1.0 mL Plasma from a Green Top Tube - Li Heparin in a Plastic Vial
4 days Ambient
7 days Refrigerated
28 days Frozen
Separate serum after clotting.
Draw Upright Specimens at least 1/2 hour after patient sits up
0.25 mL Serum
Refer to Interpretive Results
Approximately 1-2% of individuals with primary hypertension have primary hyperaldosteronism characterized by hypokalemia (low potassium) and low direct renin. Because serum aldosterone concentrations vary due to dietary sodium intake and body position, some physicians prefer measurement of 24-hour urine concentrations for aldosterone.
*Pediatric data from J Clin Endocrinol Metab. 1992;
75:1491 and J CLin Endocrinol Metab. 1989; 69:1133-1136.
3 to 6 days
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