| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # |
Glucose Tolerance Screen (Gestational), Plasma or Serum
Test CodeGLUCG - NOCO
Alias/See Also
GTT
CPT Codes
82950
Preferred Specimen
1.0 mL plasma from Green top (Lithium Heparin)
Minimum Volume
0.5 mL
Other Acceptable Specimens
1 mL serum from Serum Gel or Red Top
Instructions
A copy of the Glucose Tolerance Patient Information (English / Spanish) should be given to the outpatient.
- Fasting specimen is not necessary.
- Draw blood 1 hour following ingestion of 300 mL of water and 50 g of Glucola supplied.
Specimen Stability
| Specimen Type | Temperature | Time |
| Plasma Li Hep | Refrigerated | 72 hours |
| Serum SST | Refrigerated | 72 hours |
| Red Top – Separated* | Refrigerated | 72 hours |
*Centrifuge and aliquot into a plastic vial.
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Gross hemolysis
For NCMC only: Gross lipemia if plasma - Serum specimen needed if Grossly Lipemic.
For NCMC only: Gross lipemia if plasma - Serum specimen needed if Grossly Lipemic.
Methodology
Hexokinase Bichromatic Endpoint
Setup Schedule
Monday through Sunday; Continuously
Report Available
Same day
Reference Range
BFCMC, NCMC, & Summit View
>10 years: ≤140 mg/dL
Critical value (automatic call-back): <50 or >490 mg/dL
Interpretive Data: Based on a 50 gm oral glucose load without regard to fasting status in pregnant women.
Note: It is recommended by the American Diabetes Association that pregnant patients with 1 hour screening glucose values ≥140 mg/dL be administered a 3 hour gestational GTT as clinically indicated.
McKee
≤134 mg/dL
>10 years: ≤140 mg/dL
Critical value (automatic call-back): <50 or >490 mg/dL
Interpretive Data: Based on a 50 gm oral glucose load without regard to fasting status in pregnant women.
Note: It is recommended by the American Diabetes Association that pregnant patients with 1 hour screening glucose values ≥140 mg/dL be administered a 3 hour gestational GTT as clinically indicated.
McKee
≤134 mg/dL
Clinical Significance
Gestational diabetes is carbohydrate intolerance of variable severity with onset or first recognition during the present pregnancy. The diabetes usually disappears after the birth of the baby but may be associated with an increased risk of diabetes in the mother.
Performing Laboratory
Banner Fort Collins Medical Center Laboratory
Mckee Medical Center Laboratory
North Colorado Medical Center Laboratory
Summit View Laboratory
