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The University of Chicago Medicine Laboratories

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Mayo Clinic Laboratories

Test Code URP Urine Phosphorus, Timed

Important Note

If ordering a random collection, use order code RP. 

Specimen and Container/Tube

Specimen Type: Urine, 24 Hour Timed Collection

Preferred Specimen:  24 Hour Sterile Plastic Container

Other Acceptable specimens: Sterile Clean Glass Container

Specimen Stability

Storage Temperature

Stability

Room temperature

not stable

Refrigerated

2 days 

(6 month stability if acidified) 

Frozen

not stable

Collection Instructions

  • Provide 24-hour urine collection instructions and container to patient.
  • Collect specimen per standard laboratory collection procedures. 
  • No preservatives or additives.
  • Keep 24 hour urine refrigerated during collection process. 

Specimen Handling and Transport Instructions

UCMC Onsite Instructions: 

  • Collect specimen per standard collection procedure and send to laboratory immediately.
  • No preservatives or additives.

UCMC Offsite and UC MedLab Outreach Instructions: 

  • Samples should be centrifuged within 2 hours of collection
  • No preservatives or additives
  • Aliquot 10.0 mL of well mixed urine into plastic tube. 
  • Urine samples must then be sent refrigerated at 2-8oC.

Rejection Criteria

  • Common specimen rejected situations include: incorrect specimen type, insufficient volume, missing or incomplete specimen identifiers, incorrect specimen transport, or specimens outside stability limits. 
  • Specimens that are collected with preservatives or additives.

Reference Values

 

Test

Age

Sex

Reference Range

Urine Phosphorus Timed

All

All

400 - 1300 mg/24hr 

Critical Values

Not applicable

Turnaround Time

Turnaround times are relative to the time the specimen is received in the test laboratory. 

STAT Turnaround Time: 1 hour

Routine Turnaround Time: 4 hours

Testing Schedule: 24/7

Clinical Indications

Management of a variety of disorders including bone, parathyroid and renal disease.

Test Components

Urine collection duration, Urine total volume, Urine phosphorus random, Urine phosphorus timed 

CPT Codes

84105

LOINC Codes

2779-7, 2778-9

Methodology

Molybdate UV Spectrophotometric (Roche Diagnostics)

Synonyms/Keyword Search

24 hour urine phosphorus

Last Review Date

4/7/2025

Volume

Preferred Volume: 10.0 mL

Minimum Volume: 1.0 mL