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ALDOSTERONE/RENIN ACTIVITY RATIO

Mnemonic

ALDOST RAR

Guidelines

Patient Preparation

Supine: 1. Both specimens should be obtained between 8 am and 10 am (after at least 2 hours in supine position). 2. Normal sodium diet (100-200 mEq/day) for at least 3 days. 3. Receiving no medication known to affect renin-aldosterone system. 

Upright: 1. Both specimens should be obtained before noon (after at least 2 hours in upright position, seated or standing). 2. Normal sodium diet (100-200 mEq/day) for at least 3 days. 3. Receiving no medication known to affect renin-aldosterone system.

Specimen Collection Requirements

Collect

Serum and Plasma, one gold (SST) AND one lavender (EDTA) top tube

Handling

Separate from cells ASAP. Transfer 1 mL serum AND 2 mL EDTA plasma to individual transport tubes. Freeze immediately. CRITICAL FROZEN. Separate specimens must be submitted when additional tests are ordered.

Preferred Volume

1.0 mL serum AND 2.0 mL EDTA plasma

Minimum Volume

0.5 mL serum AND 1.2 mL EDTA plasma

Transport

CRITICAL FROZEN. Separate specimens must be submitted when additional tests are ordered.

Rejection Criteria

Refrigerated plasma, refrigerated serum, hemolyzed

Stability

AFTER SEPARATION FROM CELLS: Ambient: 8 hours; Refrigerated: Unacceptable; Frozen: 1 month

Testing Information

Performed

7 days/week

Reported

2-6 days

Method

Quantitative Chemiluminescent Immunoassay

Referral Lab

ARUP (70073)

Reference Values

Reference Values

Interpretation provided.

CPT Codes

82088, 84244

Last Updated: Thursday, September 21, 2017 02:56:57 PM


Client Services: 503-413-1234