Glucose Tolerance, Gestational Alternative (75 gram 2 Hour Gestational OGTT)


Sunquest Code:GTTG75  
Epic Code:LAB3513Epic Name:Glucose Tolerance Gest Alt 75 GM 2 HR
Methodology:Bichromatic end point, glucose oxidase
CPT Code:----------CPTCODES HERE----------
Test Includes:Fasting 1 hr, 2 hr. Alternative 75 g glucose during pregnancy. See Glucose Tolerance, Gestional Screen also.
Turnaround Time:Performed Mon-Fri, 0700-1700; turnaround time is 2 hours from the time the last specimen was collected.
Special Instructions:PCU/Clinic can obtain glucose solution from the pharmacy.
Associated Links:

Glucose Tolerance Testing



Collection Instructions

Specimen:Blood
Optimal Volume:2.5 mL
Minimum\Peds Volume:0.6 mL
Container:Green (lithium heparin, gel) (Green (lithium heparin) on ICE, Green (sodium heparin, no gel), Green (sodium heparin, no gel) on ICE, Gray (sodium fluoride + potassium oxalate), Red (no gel), Red or gold (gel))
Collection Instructions:
 
  • Patient must plan to stay in the immediate area and remain quiet.
  • Measure fasting gluose level before glucose solution is administered. No caloric intake is required. Coffee, diet soda or gum are not allowed during fasting period. A fasting glucose greater than 126 mg/dL is reported to the physician before continuing the test.
  • Administer oral glucose solution and begin timing as patient finishes the glucose solution. Patient should finish drinking the solution within 10 minutes. Alternative dose is 75 grams glucose during pregnancy.
  • Collect specimens at 1 and 2 hours from time patient finishes the glucose solution. Label each specimen with collection time, patient name, and identification number.
  • For glucose tolerance blood specimens collected in hospital, deliver to laboratory individually as collected.
Contraindications:If patient becomes ill or vomits, test must be discontinued.


Processing and Shipping

Specimen Processing:Centrifuge and aliquot 1.25 mL, 0.2 mL minimum. Store in refrigerator.
Shipping Instructions:Ship at refrigerated temperature.
Test Performed at or Referral Lab Chemistry  (Fairview Range - FRMC, UMMC-East Bank, Fairview Lakes - FLMC, Fairview Ridges - FRH, Fairview Northland - FNMC, Fairview Southdale - FSH, UMMC/UMMCH-West Bank)


Interpretive

Reference Range:

 

mg/dL

Fasting

Less than 95

1 hour

Less than 180

2 hour

Less than 155

Blood glucose levels collected at fasting, 1 hour and 2 hour after ingestion of 75 g glucose during pregnancy. A diagnosis of gestational diabetes mellitus may be made if 2 or more of the above results are met or exceeded.

 



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