CALCULI, URINARY

Test Code

120790

Alias/See Also

Kidney Stone

CPT Codes
82360

Includes

"• Ammonium acid urate; calcium bilirubinate; calcium carbonate; calcium hydrogen phosphate; calcium oxalate dihydrate; calcium oxalate monohydrate; calcium phosphate; cellular material; cholesterol; core composition; cystine; dried blood; magnesium ammon

Preferred Specimen

"Calculi
"

Instructions

"Calculi must be submitted completely dry. Specimens should not be submitted in liquid (formalin, urine, blood, etc), in gauze, filters, taped, or on Q-tips. There will be delay in analyzing and reporting specimens not received completely dry.
"

Transport Container

"Clean container or capsule
"

Transport Temperature

Room temp

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

"Percentage of interior and exterior layers
"

Methodology
"Optical microscopy In the United States, the incidence of urinary tract calculi is common, with one person in 1000 requiring hospital care and treatment. A typical urinary calculus is composed of crystalline substances precipitated in the body. To ensure proper treatment and prevention of recurrences of urinary calculi, it is critical that the crystalline constituents of the stone be identified. Mandel describes fifteen crystalline substances common in urinary calculi and subdivides them into six broad catagories.1 Calculi, Urinary Chemical Name Formula Mineralogic Name Calcium oxalate monohydrate CaC2O4 • H2O Whewelite Calcium oxalate dihydrate CaC2O4 • 2H2O (to 2 • 5H2O) Weddellite Magnesium hydrogen phosphate trihydrate MgHPO4 • 3H2O Newberyite Magnesium ammonium phosphate hexahydrate MgNH4PO4 • 6H2O Struvite Hydroxyapatite Ca10(PO4)6 (OH)2 Hydroxyapatite Carbonate-apatite Ca10(PO4)6-x (OH)2-y (CO3)x+y Carbonate-apatite Calcium hydrogen phosphate dihydrate CaHPO4 • 2H2O Brushite Uric acid C5H4N4O3 Uric acid dihydrate C5H4N4O3 • 2H2O Ammonium acid urate C5H3N4O3NH4 Sodium acid urate monohydrate C5H3N4O3Na • H2O Cystine [-SCH2CHNH2COOH]2 Xanthine C5H4N4O2 "

Reference Range

"Percentage of interior and exterior layers
"

Clinical Significance

"Evaluate stone composition, metabolic factors affecting stone formation; work up nephrolithiasis
"

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.