Phosphorus, 24 Hour, Urine - Mayo Clinic Laboratories Rochester

Useful For

Evaluation of hypo- or hyper-phosphatemic states

Evaluation of patients with nephrolithiasis

Special Instructions

Urine Preservatives-Collection and Transportation for 24-Hour Urine Specimens

Method Name

Molybdic Acid

Reporting Name

Phosphorus, 24 HR, U

Specimen Type

Urine

Necessary Information

24-Hour volume (in milliliters) is required.

Specimen Required

Supplies: Sarstedt 5 mL Aliquot Tube (T914)

Collection Container/Tube: 24-Hour graduated urine container with no metal cap or glued insert

Submission Container/Tube: Plastic, 5 mL tube or a clean, plastic aliquot container with no metal cap or glued insert

Specimen Volume: 4 mL

Collection Instructions:

1. Collect urine for 24 hours.

2. Refrigerate specimen within 4 hours of completion of 24-hour collection.

Additional Information: See Urine Preservatives-Collection and Transportation for 24-Hour Urine Specimens for multiple collections.

Specimen Minimum Volume

1 mL

Specimen Stability Information

Specimen Type	Temperature	Time
Urine	Refrigerated (preferred)	14 days
	Frozen	30 days
	Ambient	7 days

Reference Values

≥18 years: 226-1,797 mg/24 hours

Reference values have not been established for patients who are less than 18 years of age.

Day(s) Performed

Monday through Sunday

Performing Laboratory

Mayo Clinic Laboratories in Rochester

CPT Code Information

84105

LOINC Code Information

Test ID	Test Order Name	Order LOINC Value
POU	Phosphorus, 24 HR, U	2779-7

Result ID	Test Result Name	Result LOINC Value
POUU	Phosphorus, 24 HR, U	2779-7
TM12	Collection Duration	13362-9
VL10	Urine Volume	3167-4

Test Classification

This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.

NY State Approved

Yes

Urine Preservative Collection Options

Note: The addition of preservative or application of temperature controls must occur within 4 hours of completion of the collection.

Ambient	OK
Refrigerate	Preferred
Frozen	OK
50% Acetic Acid	OK
Boric Acid	OK
Diazolidinyl Urea	OK
6M Hydrochloric Acid	OK
6M Nitric Acid	No
Sodium Carbonate	No
Thymol	OK
Toluene	No

Forms

If not ordering electronically, complete, print, and send a Renal Diagnostics Test Request (T830) with the specimen.

Report Available

1 to 3 days

Mayo Clinic Laboratories Rochester

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Test ID POU Phosphorus, 24 Hour, Urine