Glucose Tolerance Screen (Gestational), Plasma or Serum

Test Code
GLUCG - 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


Methodology
Hexokinase Bichromatic Endpoint

Setup Schedule
Monday through Sunday; Continuously


Report Available
Same day


Reference Range
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.
NCMC, MMC, BFCMC, SRMC & EMCH
            ≤134 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.


Performing Laboratory
Banner Fort Collins Medical Center Laboratory
Mckee Medical Center Laboratory
North Colorado Medical Center Laboratory
Summit View Laboratory
Sterling Regional Medical Center
‚ÄčEast Morgan County Hospital



The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.