#ExistPATIENTPREP>Patient Prep: Supine: 1. Specimen should be obtained between 8 a.m. and 10 a.m. (after at least two hours in supine position); 2. Normal sodium diet (100-200 mEq/day) for at least three days; 3. Take no medications known to affect renin-aldosterone system.
Upright: 1. Specimen should be obtained before noon (after at least two hours in upright position; seated or standing); 2. Normal sodium diet (100-200 mEq/day) for at least three days; 3. Take no medications known to affect renin-aldosterone system.
Contact Medical Director if more information is needed.
#ExistCollect>Collect: Lavender (EDTA) or pink (K2EDTA). Do not collect in refrigerated tubes.
#ExistSPECIMENPREPARATION>Specimen Preparation: Separate plasma from cells ASAP. Transfer 2 mL plasma to an ARUP Standard Transport Tube and freeze immediately. (Min: 1 mL)
#ExistSPECTRANSPORT>Storage/Transport Temperature: CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered.
#ExistConditions>Unacceptable Conditions: Serum. Specimens collected in citrate, heparin, or oxalate. Hemolyzed or refrigerated specimens.
#ExistStability>Stability (collection to initiation of testing): After separation from cells: Ambient: 4 hours; Refrigerated: Unacceptable; Frozen: 4 weeks