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Test Code
Order the workpar '1TV' with this test. Enter the collection time (period) in hours and the total volume in mL. It will report the collection and total volume. There is no charge for this test.
Container TypeSerum separator tube (gold, brick, SST, or corvac) and 24 hour dark plastic urine container
Supply Item Numberpicture1467 picture1108
Specimen TypeSerum and 24 hour urine collection
Preferred Volume2 mL serum and 40 mL urine
Emergency Minimum Volume0.5 mL serum and 1 mL urine
Collection ProcedureCollect a 24 hour urine in a 24 hour dark plastic urine container. Refrigerate during collection. Collect serum at the same time as urine collection.
Specimen ProcessingSeparate serum from cells and place in separate plastic tube. Aliquot 40 mL of a well-mixed 24 hour urine collection into a leakproof plastic urine container. Record collection time and total volume.
Store and TransportRefrigerated
Required Patient InfoHeight, weight, collection period, and total volume
StabilityRefrigerated Serum: 2 weeks; urine: 1 week  
Unacceptable ConditionPlasma with anticoagulants containing ammonium ions
Alternate SpecimensFrozen urine specimens, EDTA or sodium heparin plasma (lavender or green top tubes)
CPT Codes84545
Interface Order Code84999.Z146
Billing CodeURCLE
Test ScheduleMon-Sat
Turnaround Time1-2 days
MethodColorimetric and Calculation
Reference Ranges
Urea, Urine12-20g/24h
Urea ClearancemL/min/1.73m2

Interface Codes
typeorder codetest descriptionresult coderesult descriptionunitsdecimal placesloinc code
o84999.Z146Urea Clearance
r84999.Z146Urea Clearance81050Volume/mLmL028009-9
r84999.Z146Urea Clearance83999.Z5Collection Period/hh 13362-9
r84999.Z146Urea Clearance84520BUNmg/dL03094-0
r84999.Z146Urea Clearance84540Urea, Urine Randommg/dL03092-4
r84999.Z146Urea Clearance84540.Z1Urea, Urine, g/24hg/24h03096-5
r84999.Z146Urea Clearance84999.Z58Urea ClearancemL/min/1.73m203098-1