The University of Iowa (UIHC)
Department of Pathology
LABORATORY SERVICES HANDBOOK


Glucose Tolerance Test-Additional Specimens
Order Code: GT05
Order Form: A-1a General Lab or IPR Req
  Chemistry
6240 RCP
356-3527
Specimen
Plasma
Collection Medium:
Gray top tube (Fluoride)
Alternate
Collection Media:
Call laboratory for additional acceptable specimen collection 
containers.
Minimum:
7 ml whole blood for extra specimen (added to GTT series)
Testing Schedule:
24 hrs/day, 7 days a week, including holidays.
Analytic Time:
2 hours (upon receipt in laboratory)
Comments:
CPT code = 82947
Test
Limitations:
Icterus: No significant interference up to an I index of 60 
(approximate conjugated and unconjugated bilirubin concentration: 60 
mg/dl).

Hemolysis: No significant interference up to an H index of 1000 
(approximate hemoglobin concentration 1000 mg/dl).

Lipemia (Intralipid): No significant interference up to an L index of 
1000 (approximate triglycerides concentration 2000 mg/dl). There is 
poor correlation between turbidity and triglycerides concentration.
Methodology:
Enzymatic
CPT Code:
See comments

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Updated: 04/10/2006

Note: The information contained in this handbook is for use by personnel of University of Iowa Health Care. No other use is implied or intended.