Mayo Test Catalog, (Sorted By Test Name) - Mayo Medical ...

PHBF
8029
RPOU
84007
16-17 years: 3.1-4.7 mg/dL
> or =18 years: 2.5-4.5 mg/dL
Reference values have not been established for patients that are less than 12 months of age.
Clinical References: 1. Tietz Textbook of Clinical Chemistry, Edited by Burtis and Ashwood. WB
Saunders Co, Philadelphia, PA, 1994 2. Yu GC, Lee DBN: Clinical disorders of phosphorus
metabolism. West J Med 1987;147: 569-576
Phosphorus, Body Fluid
Clinical Information: Not available
Useful For: Not established
Interpretation: None available
Reference Values:
Not Applicable
Clinical References: Tietz Textbook of Clinical Chemistry. Edited by Burtis and Ashwood.
Philadelphia, WB Saunders Co, 1994
Phosphorus, Pediatric, Random, Urine
Clinical Information: 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. A variety of factors influence renal tubular phosphate
reabsorption, and consequent urine excretion. Factors that increase urinary phosphorous excretion
include high phosphorous diet, parathyroid hormone, extracellular volume expansion, low dietary
potassium intake and proximal tubule defects (eg, Fanconi syndrome, X-linked hypophosphatemic
rickets, tumor-induced osteomalacia). Factors that decrease, or are associated with decreases in, urinary
phosphorous excretion include low dietary phosphorous intake, insulin, high dietary potassium intake,
and decreased intestinal absorption of phosphorous (eg, phosphate-binding antacids, vitamin D
deficiency, malabsorption states). A renal leak of phosphate has also been implicated as contributing to
kidney stone formation in some patients.
Useful For: Evaluation of hypo- or hyperphosphatemic states Evaluation of patients with
nephrolithiasis A timed 24-hour urine collection is the preferred specimen for measuring and
interpreting this urinary analyte. Random collections normalized to urinary creatinine may be of some
clinical use in patients who cannot collect a 24-hour specimen, typically small children. Therefore, this
random test is offered for children 0.34 0.34 0.34 0.33 0.33 0.32 0.22 0.21