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

Additional Codes

Epic Ordering Code (StoneB)	LAB3041687
Epic Ordering Code (StoneU)	LAB3041688
NBS code	LBC01447
Service code	31153

Specimen Requirements

Submit the following:

Blood	24 Hr Urine
Yellow Top	24 Hr Urine Container

Preservative types accepted (24 hr urine): Thymol

Submit cumulative 24-hour urine collection. Do not aliquot.

Additional information: 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.

NUH Outreach: Submit a 50 mL aliquot from the completed collection. Record the type of preservative used and total 24-hour urine volume on the bottle.

Processing Requirements

Blood

Allow specimen to clot for 30 mins and centrifuge within 2 hours

Specimen type: Serum

Volume: 0.5mL

24 Hr Urine

Centrifuge sample before analysis.

Specimen type: 24hr Urine

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

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

Methodology

See individual test listings for methodology

Days and Times Performed

TAT 2 – 8 days

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.

Update

Last updated 31/07/2026

LOINC Code Information

See individual test listings for LOINC code information.

Panel Information

Stone B

Panel includes the following tests:

Stone U