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Geisinger Medical Laboratories Test Catalog
GLUCOSE TOLERANCE TEST, 5 HOUR |
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Geisinger Epic Procedure Code: LAB3369
Geisinger Epic ID: 75073
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SPECIMEN COLLECTION |
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Specimen type: |
Plasma | |
Preferred collection container: |
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Specimen required: |
1 mL aliquot of plasma for each time interval; minimum 0.2 mL. | |
Special notes: |
Specimens must be collected on a time schedule (Fasting, 0.5 hour, 1 hour, 1.5 hour, 2 hour, 3 hour, 4 hour and 5 hour). Place specimen on ice, or centrifuge and separate plasma from cells. | |
Patient preparation: |
8-hour fasting is required. After collection of fasting specimen, 75 g of glucose should be given immediately for adult. For children (under 18 years of age), 1.75 g glucose/kg ideal body weight up to a maximum dose of 75 g or per physician request. | |
| SPECIMEN PROCESSING |
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Specimen processing instructions: |
Centrifuge to separate plasma within 2 hours of collection. | |
Transport temperature: |
Refrigerated (preferred). | |
Specimen stability: |
3 days (spun and unspun). | |
Rejection criteria: |
Stability limits exceeded. | |
TEST DETAILS |
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Reference interval: |
Not specified. | |
Critical values/courtesy alerts: |
Glucose below 45, above 500 mg/dL | |
CPT code(s): |
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| Note: The billing party has sole responsibility for CPT coding. Any questions regarding coding should be directed to the payer being billed. The CPT codes provided by GML are based on AMA guidelines and are for informational purposes only. | ||
Test includes: |
Fasting glucose (GSFAST), 1/2-hour glucose (GS05), 1-hour glucose (GS10), 1-1/2 hour glucose (GS15), 2-hour glucose (GS20), 3-hour glucose (GS30), 4-hour glucose (GS40), 5-hour glucose (GS50) | |
Methodology: |
Spectrophotometric (Colorimetric) |
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Clinical significance: |
This test can be used to evaluate hypoglycemia. | |
Doctoral Director(s:) |
Hoi-Ying Elsie Yu, PhD, DABCC, FADLM Sheng-Ying (Margaret) Lo, PhD, DABCC |
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| Review Date: | 12/14/2022 | |
Performing Locations
Geisinger Wyoming Valley Medical Center
Geisinger Shamokin Area Community Hospital