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UW Health SMPH
American Family Children's Hospital

UW Hospital and Clinics Lab Test Directory

Test Name: Glucose Tolerance, 2 hour

Test Code(s): GLUTOL2 / HC2HRGLUC

CPT Code(s): 82947, 82950

Test Description: Test Component:

Fasting glucose and 2 hour draw after administration of a glucose containing solution.


Methodology: Hexokinase

Days Performed: Daily, 24 hours.

Turnaround Time: Stat: Not available stat.
Routine: 4 hours.


Specimen Requirements

Specimen: Blood

Patient Preparation: Patient should have nothing to eat or drink (except water) for 8-10 hours before test.

Collection Instructions: A fasting blood glucose specimen is drawn.  The patient ingests a solution containing 75 gm of glucose.  A second blood specimen is drawn 2 hours post-ingestion.

Collection Container: Preferred: Green cap with yellow ring (PST)
Also Acceptable: Green top, Red cap with yellow ring (SST), Red top

Collection Volume: Preferred: 1 mL
Pediatrics: 0.3 mL

Sample Analyzed: Plasma or serum

Volume Required: Preferred: 0.5 mL
Pediatrics: 0.1 mL

Specimen Processing: Centrifuge. If a complete barrier has not formed, transfer cell-free plasma/serum to plastic vial. Refrigerate.

Specimen Transport: Transport specimen to laboratory. Transport with coolant pack if coming from outreach location.

Stability: Ambient: 8 hours
Refrigerated: PST - 48 hrs; if off cells or SST - 4 days
Frozen: okay


Interpretation

Critical Calls: View

Oral Glucose Tolerance Test
Glucose Challenge
OGTT
OTT
GTT

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