Glucose Tolerance, Gestational Screen 1 Hour (50g)
| Abbrev Code: | GLU1 | ||
| Order Code: | LAB3503 | Order Name: | Glucose Tolerance, Gest Screen1 Hour |
| Synonyms: | GTT; Glucose Challenge | ||
| Methodology: | Bichromatic endpoint, glucose oxidase
Woodwinds: Hexokinase |
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| CPT Codes: | 82950 x1, 82952 x1 | ||
| Test Includes: | Blood glucose level collected one hour after ingestion of 50 g glucose | ||
| Turnaround Time: | Performed Mon-Fri, 0700-1700; turnaround time is 2 hours routine, 40 minutes stat. | ||
| Special Instructions: | This is a screening test usually administered between 24-28 weeks of pregnancy. | ||
| Associated Links: | |||
Collection Instructions
| Specimen: | Blood |
| Optimal Volume: | 2.5 mL |
| Minimum\Peds Volume: | 0.6 mL |
| Collection Instructions: | Chemistry Tests Containers Chart
Glucose Tolerance Protocol Outpatient Laboratory will collect specimens in green top (heparin) or red/black top (gel) tubes to avoid hemolysis. For Womens Health Clinic:
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| Patient Preparation: | Patient does not need to be fasting and needs no preparation. The gestational diabetic screen is performed without regard to last meal or time of day. |
| Contraindications: | If patient becomes ill or vomits, test must be discontinued. |
Processing and Shipping
| Specimen Processing: | Centrifuge and aliquot 1.25 mL, 0.2 mL minimum. Store in refrigerator. |
| Shipping Instructions: | Ship at refrigerated temperature. |
| Stability: | Roche and Vista: Once separated from cells: 8 hours at room temperature; 72 hours refrigerated. |
| Test Performed at or Referral Lab | Chemistry (Clinics, CSC Maple Grove, Roche-CSC Mpls, Roche-Grand Itasca, Roche-Lakes, Roche-Northland, Roche-Range, Roche-Ridges, Roche-Southdale, Roche-St. John's, Roche-UMMC East, UMMC/UMMCH-West Bank, Woodwinds) |
Interpretive
| Critical Range: | Glucose Tolerance Reference Ranges |
| Reference Range: | Glucose Tolerance Reference Ranges |
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