Glucose Tolerance Test-3 HR
| Order Code: | GT30 |
| Epic Lab Code: | LAB164 |
| Order Form: | A-1a General Lab or Epic Req |
Chemistry
6240 RCP
356-3527
6240 RCP
356-3527
Specimen:
Plasma
Collection Medium:
 |
| Gray top tube (Fluoride) |
Alternate
Collection Media:
Call laboratory for additional acceptable specimen collection containers.
Minimum:
2 mL; gray (sodium fluoride) top (or ONE microtube for pediatric
patients) per specimen.
Testing Schedule:
24 hrs/day, 7 days a week, including holidays.
Analytic Time:
1 hour (upon receipt in laboratory)
Reference Range:
The criteria proposed by the Fourth International Workshop-Conference
on Gestational Diabetes Mellitus (GDM) defines GDM as present if two or
more of the following plasma glucose values are met or exceeded:
Fasting plasma glucose concentration > 95 mg/dL (5.3 mmol/L)
One-hour plasma glucose concentration > 180 mg/dL (10 mmol/L)
Two-hour plasma glucose concentration > 155 mg/dL (8.6 mmol/L)
Three-hour plasma glucose concentration > 140 mg/dL (7.8 mmol/L)
Reference: Carpenter MW, Coustan DR. Criteria for screening tests for gestational diabetes. Am J Obstet Gynecol 1982; 144:768.
Fasting plasma glucose concentration > 95 mg/dL (5.3 mmol/L)
One-hour plasma glucose concentration > 180 mg/dL (10 mmol/L)
Two-hour plasma glucose concentration > 155 mg/dL (8.6 mmol/L)
Three-hour plasma glucose concentration > 140 mg/dL (7.8 mmol/L)
Reference: Carpenter MW, Coustan DR. Criteria for screening tests for gestational diabetes. Am J Obstet Gynecol 1982; 144:768.
Comments:
Collect all specimens in gray top tube on patient care area and hold
(sodium fluoride anticoagulant). Deliver all specimens simultaneously.
Microtube specimens must be scheduled with the lab in advance and
delivered immediately after drawing.
Three hour Glucose Tolerance Test should include the following
specimens:
Fasting glucose
1 hour post glucose
2 hour post glucose
3 hour post glucose
CPT code is 82947 x number of specimens
CPT code = 82947 x number of glucose performed
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:
Hexokinase/UV Test
CPT Code:
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