Test Overview
Test Methodology

Hexokinase, NADH endpoint

Reference Range *

Fasting <92.0 mg/dL; 1 hr <180.0 mg/dL; 2 hr <153.0 mg/dL

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

Test Details
Days Set Up
Daily, 24 hours
Analytic Time

2 hours, once received in laboratory performing testing

Soft Order Code
GLU21
MiChart Code
OGTT (2h-75g) GDM, Not MM criteria, IADPSG
Synonyms
    Laboratory
    Clinical Core Laboratory
    Section
    Clinical Chemistry
    STAT Availability

    STAT requests for this test will be performed on a STAT basis (supervisory staff approval is not required)

    Specimen Requirements
    Collection Instructions

    Collect blood in an SST tube from a fasting patient. Administer 75 gm Glucola. Instruct patient to finish drinking the Glucola within 5 minutes of the time he or she starts drinking and not to eat anything except a few sips of water after finishing the Glucola. Collect blood in an SST tube exactly 1 and 2 hours after the patient finished drinking the Glucola. Centrifuge within 2 hours of collection, aliquot serum into a plastic vial and refrigerate. If specimen cannot be centrifuged at client site, please arrange for delivery to MLabs within 3 hours of specimen collection. Label vials appropriately (Fasting and 1 HR and 2 HR).

    Normal Volume

    0.5 mL serum

    Minimum Volume

    0.25 mL serum

    Storage Temperature
    After separation of cells, tightly capped samples of serum are stable for eight hours at 25C and for 3 days at 2-8C.
    Billing
    CPT Code
    82951
    Fee Code
    20521
    LOINC
    LOINC: 1558.6 for GLF Glucose, Fasting LOINC: 20438-8 for GL60 Glucose, 1-hour LOINC: 25667-7 for GL120 Glucose, 2-hour
    NY State Approved
    No