Lab Information Manual

Laboratory:

Clinical Biochemistry (AUTOMATED)

Test Name:

CITRATE- 24hr - (U)

Test Code: CITU

Clinical Information:

Test Indications: Urinary citrate is a major inhibitor of kidney stone formation due in part to binding of calcium in urine. Low urine citrate levels are considered a risk for kidney stone formation

Recommendations: 24-hour collection is the preferred specimen for measuring and interpreting citrate levels. Random collections normalized to urinary creatinine may be of some clinical use in pediatric patients who cannot collect a 24-hour specimen. Random samples from patients >17 years of age are not accepted

Collection Devices:

Preferred Device:

1 - Urine Collection Container - 24 h

Urine Collection Container - 24 h
Manufacturer: VWR Scientific Products/Simport Plastics

Catalogue #: CA73960-110

Specimen Required:

Urine: 10.0 mL

Pediatric Urine: 5.0 mL

Collection Information: No preservative is required

Referral:

Urine: 10.0 mL

Pediatric Urine: 5.0 mL

Refer to JA110-50-01A

Specimen Stability:

Refrigerated: 14 Days

Frozen: 14 Days

Testing Laboratory (MB): St. Boniface Lab

Requisition:

_SH Urine Testing Requisition (R250-10-95)

Reference Values:

Citrate 24 Hour Urine
Age (years)	Normal Range (µmol/d)
0 - 20	reference ranges not established
21 - 30	> 780
31 - 40	> 1150
41 - 50	> 1520
51 - 60	> 1890
>=61	reference ranges not established

Method of Analysis: Enzymatic

Availability:

Within 10 Days