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
Synonyms
    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
    NY State Approved
    No