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Test Code GT4 Glucose Tolerance, 4 Hour

Important Note

Please call Hunterdon Medical Center Central Scheduling to schedule this test.

908-237-4150

Performing Laboratory

Hunterdon Medical Center Laboratory

Special Instructions

Call Hunterdon Medical Center Central Scheduling at 908-237-4150 to schedule appointment.

 

Patient Preparation:

  1. Patient should be fasting 10-12 hours prior to baseline draw. Water is permitted during this time and during testing.
  2. Fasting specimen is collected and glucose level is checked by fingerstick prior to administration of glucose.
  3. Glucose drink is administered:
  • Non-pregnant adult: 75 grams
  • Pregnant female: 100 grams
  • Child: calculated based on weight

 4. Specimens are collected at one hour intervals after the drink is completed. Including the fasting specimen, a total of five specimens will be collected.

 5. The patient is required to stay in the Out Patient Department for the duration of the test. 

Specimen Required

 

Container/Tube  
Acceptable  PST (Li Hep) Gel- Mint Green Top
Acceptable  SST
Specimen Volume  3.0 mL
Minimum Volume  1.0 mL

 

Note: Specimen(s) should be centrifuged within 1 hour of collection.

Specimen Type

Plasma/Serum

Specimen Transport Temperature

Ambient

Specimen Stability

 

Specimen Temperature Time Frame
Plasma Refrigerated 2-8°C 7 days
Serum-gel tube Refrigerated 2-8°C 7 days
Plasma/Serum Ambient 15-25°C 8 hours

Updated June 2020 

Day(s) Test Set up

Hours of testing: Tuesday – Friday (7am -11am)

Reference Values

 

Specimen Range Units
Fasting 75-98 mg/dL
I Hour 74-179 mg/dL
2 Hour 74-139 mg/dL
3 Hour 74-106 mg/dL
4 Hour 74-106 mg/dL

Methodology

UV test. Enzymatic reference method with hexokinase.

CPT Code

82951- 3 specimens

82952-each additional specimen

Loinc Code

50587-5