Sign in →

Test Code PHOS or LAB113 Phosphorus, Serum or Plasma

Specimen Requirements

Container Type:

Optimal: Gold or Mint*

*For STAT requests

Acceptable: Red or Green
Optimal Collection Volume: 

4.5mL; full tube
Minimum Volume:
  • Adults: 1 mL whole blood
  • Neonates: 1 microtainer (400-600 uL)
Collection Instructions:

Gently invert the sample 5-6 times after collection.
Specimen Transport:

Refrigerate
Processing Instructions: 

1. If serum, allow the specimen to clot for 30 minutes.

2. Centrifuge specimen within 2 hours of collection.

3. After centrifugation, specimen tubes without a gel barrier should have the serum or plasma aliquoted to a false bottom container.

4. Keep the serum or plasma refrigerated until testing can be performed.

Specimen Stability

Specimen Type Temperature Time
Serum* Refrigerated 4 days
Room Temperature 2.5 months
Frozen 1 year

*Note: Heparinized plasma in gel separator tubes is less stable than serum and is only suitable for add-on testing up to 2 days following sample collection.

Specimen Rejection Criteria

Hemolysis Mild OK; Moderate OK; Gross Reject
Lipemia Mild OK; Moderate OK; Gross Reject
Icterus Mild OK; Moderate OK; Gross Reject
Other Quantity not sufficient

Useful For

Aiding in diagnosing or monitoring various disorders of the bone, parathyroid, or kidney.

Methodology

Roche Cobas - Spectrophotometric

Reference Ranges

Age Reference Range and Reporting Units
0-10 days 4.5-9.0 mg/dL
10 day-2 years 4.5-6.7 mg/dL
2-12 years 4.5-5.5 mg/dL
Adults (> 12 years) 2.7-4.5 mg/dL

 

Critical Values

  • Low: < 0.9 mg/dL
  • High: > 12.5 mg/dL

Interpretive

PHOS - Clinical & Interpretive: Phosphorus (Inorganic), Serum (mayocliniclabs.com)

Day(s) Performed

24/7

Expected TAT

Same day

Performing Laboratory

Bronson Laboratory, Chemistry - Kalamazoo, Battle Creek, Paw Paw, South Haven

Sample Retention Time

7 days

CPT Code

84100

LOINC Code

2777-1