PHOSPHORUS, URINE, 24 HOUR

Message

Note: There is a diurnal variation in urine phosphate excretion with the highest output occuring in the afternoon.

Test Code

UPHOS (OE), UPHOS24 (LAB)

CPT Codes
84105

Preferred Specimen

24 Hour Urine Container without preservative

Patient Preparation
Discard first morning urine on day of collection and note the time. Collect all urine voided during the next 24 hours.Refrigerate the urine during entire collection. See 24 urine collection instructions link below.

Minimum Volume

5 mL aliquot (20 mL aliquot optimal)

Instructions

Mix the specimen well and measure the 24 Hour volume (RECORD THE TOTAL VOLUME)
Pour off 20 mL of urine into a separate plastic screw-cap container
Refrigerate if not tested immediately
Sample will be acidified with 6N HCL to a pH <2 prior to testing

Transport Container

Transfer tube (note the volume)

Transport Temperature

Refrigerate

Specimen Stability

Urine may contain larger quantities of organic phosphates, which can decompose on exposure to elevated temperatures. Keep refrigerated.

2-8°C up to 1 day; once acidified urine is stable up to 6 months.

Methodology
Colorimetric

Setup Schedule

M, T, W, Th, F, Sa, Su

As received; STAT testing is available

Reference Range

Age	g/24 Hours (Urine)
Adults	0.3 - 1.3
Children	1.5 - 0.8

Clinical Significance

Absorbed phosphate, under the influence of parathyroid hormone is excreted in the kidney. Measurement of urinary phosphorus reflects kidney function as well as parathyroid function.

Performing Laboratory
Alverno Central Lab

Additional Information
24 Hour Urine Collection Instructions

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.