PHOSPHORUS

Test Code

PHOS

Alias/See Also

Phosphate

CPT Codes
84100

Preferred Specimen

1 Gold tube (gel separator)

Minimum Volume

0.6 mL

Other Acceptable Specimens

1 Red tube, or
1 Green tube (Lithium or Sodium Heparin is acceptable)

Instructions

Centrifuge for complete separation of serum or plasma and red cells. If gel-seperator tube is not used, aliquot (transfer) serum or plasma into a transfer tube.

Transport Temperature

Refrigerate

Specimen Stability

15-30°C up to 8 hours
2-8°C up to 7 days

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

Hemolyzed samples

Methodology

Phosphomolybdate-UV

Setup Schedule

M, T, W, Th, F, Sa, Sun

Report Available

Same day tested at the performing laboratory.

Reference Range

2.5 - 4.5 mg/dL

**Pediatric Reference Ranges**
Age	Female Reference Ranges	Male Reference Ranges
0-14 days	5.4-10.4 mg/dL	5.4-10.4 mg/dL
15 days - <1 year	4.5-8.2 mg/dL	4.5-8.2 mg/dL
1- <5 years	4.2-6.7 mg/dL	4.2-6.7 mg/dL
5- <13 years	3.9-5.8 mg/dL	3.9-5.8 mg/dL
13- <16 years	3.0-5.4 mg/dL	3.3-6.1 mg/dL
16- <19 years	3.0-4.8 mg/dL	3.0-4.8 mg/dL

Clinical Significance

This test is used to evaluate phosphorus metabolism and calcium/phosphorus balance. In addition, this test is useful in the diagnosis and treatment of parathyroid gland and kidney diseases along with Vitamin D imbalance.

Performed By
Alverno Laboratories

Performing Laboratory
Alverno Central Lab
NCHB1 (Chemistry, Beckman AU)

Last Updated: September 13, 2024

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.