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

Glucose Tolerance Test-Additional Specimens
Order Code: GT05
Epic Lab Code: LAB4923
Order Form: A-1a General Lab or Epic 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.