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Test Code StoneB and StoneU Stone Profile Test

Important Note

Dietary/drug restrictions prior and during urine collection:

  • Do not take laxatives during the 24 hr collection period.
  • Refrain from taking vitamin C supplement or vitamin C rich food for at least 48 hrs prior to urine collection.
  • Do not drink alcoholic beverages during 24 hr urine collection.

Laboratory Code

LAB2225

Specimen Requirements

Collect urine in 24 hr urine container with a suitable preservative (available at laboratory). 
Blood must be collected within the same 24 hr period as the urine collection.
Send both blood and urine specimens to laboratory. 
Dietary and drug restrictions apply.

 

STONEB

Specimen Type: Serum
Container/Tube: Gold Top (SSTII)
Volume: 5.0 mL
Minimum Volume: 0.5 mL

 

STONEU

Specimen Type: 24 hr urine
Container/Tube: 24 hr urine container with 3.0 g Thymol
Volume: 4000.0 mL
Minimum Volume: 20.0 mL

 

Please refer to NUH's Urine Preservative Guide

Specimen Stability

STONEB

Specimen Type Serum
Ambient 8 hours
Refrigerate 3 days
Frozen 3 months

Send in primary tube, do not aliquot. A consequent decrease in the CO2 value of up to 6 mEq/L can occur in the course of an hour once the specimen has been exposed to ambient air.

 

STONEU

Specimen Type 24 hr urine
Ambient Not available
Refrigerate 2 days
Frozen Not available

Panel Information

StoneB

Panel includes the following tests:

 

StoneU

Panel includes the following tests:

Methodology

See individual test listings for methodology.

Days and Times Performed

TAT 2 – 8 days

Specimen Condition

StoneB

Gross Haemolysis Alert/Reject
Icterus OK
Gross Lipaemia Alert/Reject
Others Not applicable

 

StoneU

Haemolysis                           Not applicable
Icterus Not applicable
Lipaemia Not applicable
Others: Wrong 24 hr preservative                 Reject                                               

Reference Interval

See individual test listings for reference interval.

Testing Laboratory

National University Hospital

Clinical Chemistry, 67724346

Useful For

Diagnosis and management of renal lithiasis.

Service Code

31153

LOINC Code Information

See individual test listings for LOINC code information.

Update

Last updated 14/03/2025