Litholink 24-Hour Urine Cystine Profile

TEST: 910245
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CPT: 81050; 82131; 82340; 82507; 82570; 83986; 84105; 84300; 84540
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Synonyms

  • Urine Cystine Panel

Special Instructions

Ordering this test will trigger the Litholink At-Home testing kit to be sent directly your patient. This testing requires the use of Litholink's At-Home testing cystine kit and preservatives.

Please state the 24-hour urine volume.

Expected Turnaround Time

4 - 8 days

Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional reflex tests. Testing schedules may vary.

Specimen Requirements

Specimen

22-26 hour urine collection

Volume

Two 40 mL aliquots of 24-hour urine are required per collection: one before the addition of sodium carbonate (green-top tube) and one after the addition of sodium carbonate (orange-top tube)

Minimum Volume

Two 40 mL of 24-hour urine per collection

Collection

Included preservative functions as a volume marker must be added to the main collection container at the beginning of collection and then return a 40 mL aliquot of the 24-hour urine per collection.

Full 24-hour collection: Void and discard first urine and continue to collect for 24-hour period from that void time.

All samples must be immediately returned to the lab using the prepaid FedEx shipper.

Storage Instructions

Room temperature with preservative; do not refrigerate

Stability Requirements

Temperature

Period

Room temperature

4 days or 96 hours from end of collection

Causes for Rejection

Too old (>96 hours); under or over collected (<22 hours or >26 hours); incorrect use of the Litholink preservative or the Litholink preservative not detected

Test Details

Use

This test is used for people with known cystinuria, cystine stone formers or patients who had a reported "positive" screen from the standard Litholink test, Litholink 24-Hour Urine, KS [910235].

Limitations

This test was developed and its performance characteristics determined by Labcorp. It has not been cleared or approved by the Food and Drug Administration.

Methodology

Cystine capacity, calcium, creatinine, citrate, urea nitrogen, phosphorus: Colormetric

Sulfate: Turbidity with barium precipitation

Sodium: Ion specific electrode

pH: Potentiometry

LOINC® Map

Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
910245 Litholink 24HrUr Quant Cystine 910145 Urine Volume (Preserved) mL/24 hr 3167-4
910245 Litholink 24HrUr Quant Cystine 910132 Cystine, Quant, Urine mg/24 hr 2179-0
910245 Litholink 24HrUr Quant Cystine 910111 Cystine Saturation N/A
910245 Litholink 24HrUr Quant Cystine 910108 Cystine Capacity mg/L 2178-2
910245 Litholink 24HrUr Quant Cystine 910137 pH, 24 hr, Urine 27378-9
910245 Litholink 24HrUr Quant Cystine 910140 Sodium, Urine mmol/24 hr 2956-1
910245 Litholink 24HrUr Quant Cystine 910121 Urea Nitrogen, Urine g/24 hr 3096-5
910245 Litholink 24HrUr Quant Cystine 910119 Protein Catabolic Rate g/kg/24 hr 93746-6
910245 Litholink 24HrUr Quant Cystine 910131 Creatinine, Urine mg/24 hr 2162-6
910245 Litholink 24HrUr Quant Cystine 910127 Calcium, Urine mg/24 hr 6874-2
910245 Litholink 24HrUr Quant Cystine 910138 Phosphorus, Urine mg/24 hr 2779-7
910245 Litholink 24HrUr Quant Cystine 910129 Citrate, Urine mg/24 hr 6687-8
910245 Litholink 24HrUr Quant Cystine 910123 Brushite Saturation 42673-4
910245 Litholink 24HrUr Quant Cystine 910105 Calcium/Kg Body Weight mg/24 hr/kg Not available
910245 Litholink 24HrUr Quant Cystine 910107 Creatinine/Kg Body Weight mg/24 hr/kg 35654-3
910245 Litholink 24HrUr Quant Cystine 910194 Comment 77202-0
910245 Litholink 24HrUr Quant Cystine 911323 PDF 11502-2
Reflex Table for Calcium/Kg Body Weight
Order Code Order Name Result Code Result Name UofM Result LOINC
Reflex 1 910150 Pediatric Urine Calculations 910113 Oxalate Excretion, Normalized mg/24hr/1.73 Pending
Reflex Table for Calcium/Kg Body Weight
Order Code Order Name Result Code Result Name UofM Result LOINC
Reflex 1 910150 Pediatric Urine Calculations 910130 Citrate/Creat Ratio mg/g creat Pending
Reflex Table for Calcium/Kg Body Weight
Order Code Order Name Result Code Result Name UofM Result LOINC
Reflex 1 910150 Pediatric Urine Calculations 910115 Uric Acid Excretion,Normalized mg/24hr/1.73 Pending
Reflex Table for Calcium/Kg Body Weight
Order Code Order Name Result Code Result Name UofM Result LOINC
Reflex 1 910150 Pediatric Urine Calculations 910114 Phosphorus/Kg Body Weight mg/24 hr/kg Pending
Reflex Table for Calcium/Kg Body Weight
Order Code Order Name Result Code Result Name UofM Result LOINC
Reflex 1 910150 Pediatric Urine Calculations 910112 Magnesium/Kg Body Weight mg/24 hr/kg Pending
Reflex Table for Calcium/Kg Body Weight
Order Code Order Name Result Code Result Name UofM Result LOINC
Reflex 1 910151 Pediatric Cystine Calculations 910130 Citrate/Creat Ratio mg/g creat Pending
Reflex Table for Calcium/Kg Body Weight
Order Code Order Name Result Code Result Name UofM Result LOINC
Reflex 1 910151 Pediatric Cystine Calculations 910114 Phosphorus/Kg Body Weight mg/24 hr/kg Pending

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