Alternative Names
  • Phosphorus

Test Code: 4509

CPT: 84100
Tests Included Phosphorus
Use Measurements of phosphorus (inorganic) are used in the diagnosis and treatment of various disorders, including
parathyroid gland and kidney diseases, and vitamin D imbalance.
Clinical Utility Low levels can result in kidney stone, renal failure, acromegaly, hypoparathyroidism,
or bone metastasis.  Elevated levels are indicated with osteomalacia and hyperparathyroidism
Intended Patient Population 18+ and Older Adult Males & Females
Patient Preparation None Specified
Sample Serum, Plasma
Tube Red, Green, Tiger
Volume 4mL Whole Blood (1mL Serum/Plasma)
Min Sample Volume 0.5 mLs
Reference Ranges M & F ≥ 18 yrs old; 2.5-5.0 mg/dL
Analytical Measurement Range 1.0-20.0 mg/dL
Critical Values < 1.0 or > 9.0 mg/dL
Units mg/dL
Test Methodology Phosphomolybdate - UV
Test Turnaround Time 2 Days
Limitations None Specified
Shipping Requirements Refrigerated
Specimen Stability 7 Days RF
Reject Criteria Gross Hemolysis, Gross Lipemia, Icterus
Laboratory Developed Test (LDT) Yes
CMS Guidance None
  1. Tietz, N. W., Clinical Guide to Laboratory Tests, 3rd Edition, W. B. Saunders Company, Philadelphia, PA (1995).

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