Test Overview
Test Methodology

Liquid Chromatography - Tandem Mass Spectrometry (LC-MS/MS) Stable Isotope Dilution Analysis

Test Usage

This test is useful for the evaluation of patients with a clinical suspicion of inborn errors of creatine metabolism, including arginine:glycine amidinotransferase (AGAT) deficiency, guanidinoacetate methyltransferase (GAMT) deficiency and cellular transport (CrT1) defects.

Reference Range *

Interpretive report provided.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Details
Days Set Up
Tuesday
Analytic Time

11 - 20 days

Soft Order Code
CRDPU
MiChart Code
Creatine Disorders Panel, Urine
Laboratory
Sendout
Reference Laboratory
Mayo CRDPU (88697)
Section
Special Testing
Specimen Requirements
Collection Instructions

Collect random urine specimen with no preservative. Aliquot 1 mL into a plastic urine container and freeze immediately.

Normal Volume
1 mL aliquot of random urine collection
Minimum Volume
0.5 mL aliquot of random urine collection
Additional Information

Panel includes creatine, creatinine, guanidinoacetic acid (GAA), and creatine/creatinine ratio. Test sent to Mayo Medical Laboratories.

Billing
CPT Code
82540, 82570, 83789
Fee Code
20320, AA180, AA181
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