Synonyms
Brushite Crystal; Calcium Oxalate Crystal; Hydroxyapatite Crystal; Kidney Stone Disease; Kidney Stone Profile; Sodium Urate Crystal; Stone Risk Profile; Uric Acid Crystals; SAT24
Specimen Type
Urine, Timed Collection
Performing Lab
Mayo Medical Lab
Epic ID
Other Reference Test
Lab Test Days
Monday-Friday
Standard TAT
2-5 Days
Collection Information
Specimen Required
25-35 mL 24-Hour Urine
Container Type
24-Hour Urine Container
Collection Instructions
Collect urine for 24 Hours. Refrigerate specimen during and after collection. Specimen pH should be between 4.5-8.0 and will stay in this range if kept refrigerated. Specimens with pH >8.0 indicate bacterial contamination, and testing will be cancelled. Do not attempt to adjust pH as it will adversely affect results. 24 Hour volume is required. Patient's height in centimeters and weight in kilograms are required if patient is <18 years old.
Processing Information - Lab Use Only
Transport Temperature
Refrigerate-OK/Frozen-OK
Specimen Stability
Room Temp: Unacceptable; Refrigerated: 14 Days (Preferred); Frozen: Unacceptable
Rejection Criteria
Specimen pH>8.0
Test Volume Required
35 mL 24-Hour Urine
Minimum Test Volume
25 mL 24-Hour Urine
Processing Instructions
Indicate 24-hour volume in comments and on specimen. Patient's height in centimeters and weight in kilograms are required if patient is <18 years old. Order test in Mayolink and send with Mayo courier Monday-Friday.
Included Tests
Calcium, Chloride, Citrate excretion, Creatinine, Magnesium, Osmolality, Oxalate, pH, Phosphorus, Potassium, Sodium, Sulfate, Uric acid, Ammonium and Urea Nitrogen.
CPT Codes
82340, 82436, 82507, 82570, 83735, 83935, 83945, 83986, 84105, 84133, 84300, 84392, 84560, 82140, 84540
Revised
7/19/23
Initials
SA