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Methodology: Radioimmunoassay (RIA)
Edit Date: 2/11/2010
Performed: Tuesday, Thursday, Saturday
Released: 2-5 days after setup at PeaceHealth Laboratories’ reference lab.
CPT Code: 82088-90
Specimen Collection Details
Collection: 24-hour urine collected with 10 gm Boric Acid (or 5×2 gm tablets) added to the container prior to start of collection. Refrigerate during collection. Note time started and stopped. HCl or acetic acid are also acceptable preservatives.
Handling: A preserved 24-hour urine collection is preferred. A refrigerated collection is acceptable only if transported refrigerated and arrives at laboratory within 6 hours of actual completion of collection, not patient drop-off time. If submitting an aliquot, mix total collection well, measure and record total volume before pouring off into a urine collection container. Freeze immediately.
Stability: 2 hours ambient, 6 hours refrigerated without preservative, 7 days refrigerated with preservative, or 1 month frozen.
Standard Volume: 5 mL aliquot from a 24-hour collection.
Minimum Volume: 0.5 mL aliquot from a 24-hour urine collection.
Transport: Frozen on dry ice.
Rejection Criteria: Specimen received outside the required stated stability.

Aldosterone, Urine
Normal diet 6-25 µg/24 hrs
Low salt diet 17-44 µg/24 hrs
High salt diet 0-6 µg/24 hrs
Normal urine values of aldosterone are dependent on sodium intake.

Normal sodium intake: 100-200 mEq

Low sodium intake: < 25 mEq

High sodium intake: > 200 mEq

Creatinine (24-hour)
Age Male Female
3-8 years 140-700 mg/d 140-700 mg/d
9-12 years 300-1300 mg/d 300-1300 mg/d
13-17 years 500-2300 mg/d 400-1600 mg/d
18-50 years 1000-2500 mg/d 700-1600 mg/d
51-80 years 800-2100 mg/d 500-1400 mg/d
81 years and older 600-2000 mg/d 400-1300 mg/d

PeaceHealth Laboratories