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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 

Methodology

Molybdate UV Spectrophotometric (Roche Diagnostics)

CPT Codes

84105

LOINC Codes

2779-7, 2778-9

Synonyms/Keyword Search

24 hour urine phosphorus

Last Review Date

4/7/2025

Volume

Preferred Volume: 10.0 mL

Minimum Volume: 1.0 mL