Phosphorus, Urine 24 Hour

Message

Performing Lab: Central Lab, Regions

Test Code

3325

Alias/See Also

Sunquest: UPO24

CPT Codes
84105

Preferred Specimen

0.2 mL of a 24-hour urine collection

Minimum Volume

0.1 mL

Instructions

Preserve 24 hour urine collection with refrigeration.

Consult Urine Collection/Processing Information for acceptable preservatives

Transport Temperature

Refrigerated

Specimen Stability

Refrigerated: 7 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Unacceptable preservatives

Methodology
Colorimetric: Phosphomolybdate reduction

Setup Schedule

Hospital: Daily
Clinics: Monday - Friday

Report Available

Same Day

Reference Range

0.4 - 1.3 g/24 hours

Clinical Significance

Approximately 80% of filter phosphorous is reabsorbed by renal proximal tubule cells. The regulation of urinary phosphorous excretion is principally dependent on regulation of proximal tubule phosphorous reabsorption. Factors which increase urinary phosphorous excretion include high phosphorous diet, parathyroid hormone, extracellular volume expansion, low dietary potassium intake and proximal tubule defects (e.g. Fanconi Syndrome, tumor-induced osteomalacia). Factors which decrease, urinary phosphorous excretion, include low dietary phosphorous intake, insulin, high dietary potassium intake, and decreased intestinal absorption of phosphorous.

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.