Gestational 3HR Challenge


Test ID/Workstation: MG3HR MACH1

Specimen Type: Blood

Tube Type: Green top ( lithium heparin) tube

Collection Volume: 0.4 mL

Storage: Refrigerated

Availability: Mon-Fri, call for appointment

Methodology: Timed endpoint reaction using hexokinase

Special Instructions: Outpatients must be scheduled in advance. Patients should eat their usual diet for 3-5 days and fast 8 hours prior to testing. A fasting level will be drawn and must be < 125 mg/dL (glucometer) before proceeding. Glucose dose will be administered and blood will be collected 1 hour, 2 hour and 3 hour intervals post glucose ingestion.

Lab/Phone: 330-746-9623

TAT: 1 hour/draw

Additional Info: Criteria for Diagnosis of Gestational Diabetes Mellitus(GDM)
100g, 3HR Glucose Challenge

The Diagnosis of GDM is made when two or more of the
following plasma glucose values are exceeded:

Fasting >=95 mg/dl
1HR Glucose >=180 mg/dl
2HR Glucose >=155 mg/dl
3HR Glucose >=140 mg/dl

CPT Code: 82947, 82951

Specimen Collection Procedures
Glucose Tolerance Testing

Requisition Form
View and print a requisition form for this test

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