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Mayo Clinic Laboratories

Test Code PHORU Phosphate, Random Urine without Creatinine [14579X]

Specimen Required

10 mL random urine preserved,

Specimen Minimum Volume

2 mL

Specimen Stability

Preserved Urine Room temperature: 6 months Refrigerated: 6 months Frozen: 6 months
Unpreserved Urine Room temperature: 48 hours Refrigerated: 7 days Frozen: 28 days

Report Available

Next Day

Method Name

Spectrophotometry (SP)

Collection Container / Tube

Preferred: Urinalysis transport tube (yellow-top, blue fill line, preservative tube)
Other Acceptable Container: Unpreserved Random Urine in leakproof container

Transport / Storage Conditions

Preserved urine: Room temperature
Unpreserved urine: Refrigerated (cold packs)

Special Instructions

Adjust pH to <3.0 with 6N HCl prior to aliquoting for phosphate testing.

Reference Values

Not established

Day(s) Performed

Daily

CPT Codes

84105

Clinical Reference

Phosphorus is present in many foods with a mean intake of approximately 1500 mg per day for adult males and about 1000 mg per day for adult females. Absorbed phosphate, under the influence of parathyroid hormone is readily excreted in the kidney. Measurement of urinary phosphorus generally reflects dietary intake hence day to day excretion may show considerable variation.

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