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Test ID SSATR Supersaturation Profile, Pediatric, Random, Urine

Useful For

Diagnosis and management of patients with renal lithiasis:

-In patients who have a radiopaque stone, for whom stone analysis is not available, the supersaturation data can be used to predict the likely composition of the stone. This may help in designing a treatment program

-Individual components of the supersaturation profile can identify specific risk factors for stones

-During follow-up, changes in the urine supersaturation can be used to monitor the effectiveness of therapy by confirming that the crystallization potential has indeed decreased

-Urine ammonium can be used to evaluate renal excretion of acid and urine pH

Profile Information

Test ID Reporting Name Available Separately Always Performed
RRSUP Supersaturation Random, U No Yes
NAUR Sodium, Random, U Yes, (order KNAUR) Yes
KURR Potassium, Random, U Yes, (order RKUR) Yes
CACR2 Calcium, Random, U Yes, (order CACR1) Yes
MAGR Magnesium, Random, U Yes, (order MAGNR) Yes
CLUR Chloride, Random, U Yes, (order RCHLU) Yes
POUR Phosphorus, Pediatric, Random, U Yes, (order RPOU) Yes
SULFR Sulfate, Random, U No Yes
CITRR Citrate Excretion, Peds, Random, U Yes, (order RCITR) Yes
OXUR Oxalate, Pediatric, Random, U Yes, (order ROXU) Yes
UPHR pH, Random, U No Yes
URCUR Uric Acid, Random, U Yes, (order RURCU) Yes
CTURR Creatinine, Random, U Yes, (order RCTUR) Yes
UOSMR Osmolality, Random, U No Yes
RAMCN Ammonium, Random, U Yes, (order RAMBO) Yes

Method Name

CITRR, RAMCN: Enzymatic

OXUR: Enzymatic Using Oxalate Oxidase

UOSMR: Freezing Point Depression

SULFR: High-Pressure Ion Chromatography (HPIC)

MAGR: Colorimetric Endpoint Assay

CACR2: Photometric, NM-BAPTA Reaction

POUR: Molybdic Acid

UPHR: pH Meter

NAUR, KURR, CLUR: Potentiometric, Indirect Ion-Selective Electrode (ISE)

CTURR: Enzymatic Colorimetric Assay

URCUR: Uricase

Reporting Name

Supersaturation, Peds, Random, U

Specimen Type

Urine


Additional Testing Requirements


A timed 24-hour urine collection is the preferred specimen for measuring and interpreting this profile to determine kidney stone risk factors. Random collections with individual analytes normalized to urinary creatinine may be of some clinical use in patients who cannot collect a 24-hour specimen, typically small children. Therefore, this test is offered on random collections for children less than 16 years old.



Necessary Information


Patient's age is required.



Specimen Required


Supplies:

Urine Tubes, 10 mL (T068)

Aliquot Tubes, 5 mL (T465)

Container/Tube: 2 plastic, 10-mL urine tubes (T068) and 4 plastic, 5-mL urine tubes (T465)

Specimen Volume: 40 mL

Collection Instructions:

1. Collect a random urine specimen and divide the urine into 6 tubes.

2. Refrigerate specimen after collection. Specimen pH should be between 4.5 and 8 and will stay in this range if kept refrigerated. Specimens with pH over 8 indicate bacterial contamination and testing will be canceled. Do not attempt to adjust pH as it will adversely affect results.


Specimen Minimum Volume

30 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Urine Refrigerated (preferred) 14 days
  Frozen  14 days

Reference Values

pH: 4.5-8.0

 

OSMOLALITY

0-11 months: 50-750 mOsm/kg

≥12 months: 150-1,150 mOsm/kg

 

AMMONIUM

18-77 years: 3-65 mmol/L

No reference values established for <18 years and >77 years of age

 

CALCIUM

Random Calcium/Creatinine Ratio:

18-83 years: <0.20 mg/mg

No reference values established for <18 years and >83 years of age

 

MAGNESIUM

Random Magnesium/Creatinine Ratio:

18-83 years: ≤0.035 mg/mg

No reference values established for <18 years and >83 years of age

Day(s) and Time(s) Performed

Monday through Friday; 8 a.m.-4 p.m.

Performing Laboratory

Mayo Clinic Laboratories in Rochester

CPT Code Information

82310-Calcium

82436-Chloride

82507-Citrate excretion

82570-Creatinine

83735-Magnesium

83935-Osmolality

83945-Oxalate

83986-pH

84105-Phosphorus

84133-Potassium

84300-Sodium

84392-Sulfate

84560-Uric acid

82140-Ammonium

LOINC Code Information

Test ID Test Order Name Order LOINC Value
SSATR Supersaturation, Peds, Random, U In Process

 

Result ID Test Result Name Result LOINC Value
SULFR Sulfate, Random, U 2975-1
UOSMR Osmolality, Random, U 2695-5
UPHR pH, Random, U 2756-5
CITR1 Citrate Concentration, Peds, Random, U 2128-7
RCHLU Chloride, Random, U 2078-4
RCTUR Creatinine, Random, U 2161-8
RKUR Potassium, Random, U 2828-2
RNAUR Sodium, Random, U 2955-3
OXCON Oxalate, Pediatric, Random, U 15086-2
31241 Calcium Oxalate Crystal 5774-5
POCON Phosphorus, Pediatric, Random, U 2778-9
URCO2 Uric Acid, Random, U 3086-6
MGCON Magnesium, Random, U 19124-7
CALC4 Calcium, Random, U 17862-4
RAMCN Ammonium, Random, U 1842-4
CACTR Calcium/Creatinine Ratio 9321-1
MGCTR Magnesium/Creatinine Ratio 13474-2
RATO6 Uric Acid/Creatinine Ratio 3089-0
RATO5 Phosphorus/Creatinine Ratio 11141-9
31242 Brushite Crystal 42673-4
OXCO2 Oxalate Concentration 2700-3
RATO8 Citrate/Creatinine Ratio 13722-4
RATO7 Oxalate/Creatinine Ratio 13483-3
31243 Hydroxyapatite Crystal 81622-3
31244 Uric Acid Crystal 5817-2
31245 Sodium Urate Crystal 53788-6
31246 Interpretation 69051-1

NY State Approved

Yes

Forms

If not ordering electronically, complete, print, and send a Renal Diagnostics Test Request (T830) with the specimen.