Glucose Prenatal, 3 hour

Overview

  • EPIC Code:
  • LAB2419
  • Soft Test Code:
  • GLB3
Alternate Names
  • 3 hour Prenatal GTT
  • Gestational Diabetes 3 hour Tolerance
  • Glucose OB 3HR
  • Glucose Prenatal, 3 hour Tolerance
Included Tests

1 hour Glucose; 2 hour Glucose; 3 hour Glucose; Fasting Glucose


Specimen Collection & Preparation

Required Forms & Information

Medications should be noted on the order


Patient Preparation

Fasting for 12 hours prior to testing

  • Smoking, drinking, gum chewing, mints, cough drops, etc. are not allowed prior to or during the duration of the test.
  • Modest amounts of water may be consumed.
  • Medications may still be taken as ordered by the physician.
  • For more fasting FAQ's

If patient has additional testing that requires fasting, they must be collected prior to administering glucola beverage for this test. 


Specimen Requirements:

-OR-

1.0 mL Plasma in a PST Mint Green Top Tube - Li Heparin (One For Each Timed Collection)
Minimum Volume:
0.25 mL Plasma*

* This volume does not allow for repeat testing

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 100 grams of Glucola beverage, patient must consume the beverage within a 5 minute time frame.
  3. Start timing the test after the patient has consumed all glucola beverage.
  4. Collect subsequent timed specimens, drawn at specific time intervals. 

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. 


Processing Instructions:

Centrifuge and separate all specimens within 4 hours of each collection


Transport and Storage:
  • Ambient (18-24°C): 8 Hours
  • Refrigerated (2-8°C): 3 Days

Clinical Interpretation

Reference Range:

Fasting: 70 - 95 mg/dL
1 hour: 120 - 180 mg/dL
2 hour: 70 -155 mg/dL
3 hour: 70 - 140 mg/dL


Methodology:
  • Enzymatic
Documentation

For tolerance comparisons, refer to the PHL Glucose Tolerance Comparison Sheet in Addendum A


Production Schedule

Sites Performed
  • Parkview DeKalb Hospital
  • Parkview Huntington Hospital
  • Parkview Kosciusko Hospital
  • Parkview LaGrange Hospital
  • Parkview Noble Hospital
  • Parkview Randallia Hospital
  • Parkview Regional Medical Center
  • Parkview Southwest
  • Parkview Wabash Hospital
  • Parkview Whitley Hospital
Days Performed
Monday
Tuesday
Wednesday
Thursday
Friday
Departments
  • Chemistry
Turn Around Time

Same day/next day


Coding & Compliance

CDM

014252517, 01422518


CPT Coding

82951, 82952