Glucose Tolerance Test, 3 hour

Last Modified: 10/22/2021 8:40:36 AM

Medical Necessity Documentation:  
Client Notes:

Please remind patients of the time frame this testing will take, and that they need to be at the drawsite in plenty of time before closing, and will need to remain at the lab the entire time of the procedure.
These tolerance tests do not require an appointment however on the PRMC Campus, tolerance collections are performed at Parkview Outpatient Center, 11141 Parkview Plaza Drive, Suite 100 Fort Wayne, IN 46845 Entrance 3 Only.

**This test is not to be used for the 3hr tolerance for gestational diabetes, please see test code GLB3 for the Gestational Diabetes testing information.

Patient Preparation:
12 hour Fasting

Smoking, drinking, gum chewing, mints, cough drops, etc… are not allowed prior to or during the duration of the test

Small amounts of water are allowed after the 1-hour specimen has been collected. 

Medications may still be taken as ordered by the physician. 
Specimen Requirements: 1.0 mL Plasma in a PST Mint Green Top Tube - Li Heparin (One For Each Timed Collection)
Collection Instructions: If patient has fasting test(s) ordered, they must be collected prior to administering Glucola beverage.

If possible, medications should be noted on the order

1. Collect Fasting Specimen
2. Administer the 75 grams of Glucola beverage by having the patient consume the beverage within 5 minutes
3. Start timing the test after the patient has finished the drink.
4. Collect subsequent  timed specimens will be drawn at specific time intervals, based on the test ordered

Collection hour must be included on the specimen label along with patient’s full legal name, a unique identifier (the unique identifier may be the DOB or the requisition number), date and time of collection, and the phlebotomist’s initials. 

Specimens must be spun within 4 hours of collection

For Child Glucola Dosages refer to Addendum A
Minimum Volume: 0.2 mL
Transport & Storage: Temperature/Stability: 3 days Refrigerated

4 hours Unspun
Reference Range: Refer to report for reference ranges
Critical Ranges:  
Test Comments:  
Methodology: Enzymatic
Clinical Significance:  
Documentation: For tolerance comparisons refer to the PHL Glucose Tolerance Comparison Sheet in Addendum A
Custom Panel: No


Days Performed: Monday, Tuesday, Wednesday, Thursday, Friday
Sites Performed: Parkview Dekalb, Parkview Hospital Randallia, Parkview Huntington, Parkview LaGrange, Parkview Noble, Parkview Regional Medical Center, Parkview Wabash, Parkview Warsaw , Parkview Whitley
PHL Test Code: GTT3
EPIC Test Code: LAB164
Alternate Test Names: 3 hour GTT
Included Tests: 1 hour Glucose; 2 hour Glucose; 3 hour Glucose; Fasting Glucose
CPT Coding: 82951, 82952

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