Geisinger Medical Laboratories/Geisinger Proven Diagnostics Test Catalog

Order Display Name: Geisinger Epic Procedure Code Or ID CPT Code:  

GLUCOSE TOLERANCE TEST, 5 HOUR

ORDERING INFORMATION:
Geisinger Epic Procedure Code: LAB3369         Geisinger Epic ID: 75073

SPECIMEN COLLECTION
Specimen type:
Plasma
Preferred collection container:
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 (FBS, 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
Specimen processing instructions:
Centrifuge to separate plasma. 
Transport temperature:
Refrigerated (preferred).
Specimen stability:
3 days (spun and unspun).
Rejection criteria:
Stability limits exceeded.

TEST DETAILS
Reference interval:
Not specified.
Critical values/courtesy alerts:
Glucose below 45, above 500 mg/dL
CPT code(s):
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)
Clinical significance:
This test can be used to evaluate hypoglycemia.
Doctoral Director(s:)
Hoi-Ying Elsie Yu, PhD, DABCC
Sheng-Ying (Margaret) Lo, PhD, DABCC    
Review Date: 12/24/2020

Performing Locations

Geisinger Medical Center

Performing laboratory: Automated Chemistry
Technical Lead: Mariana Moyer, Jared Shepherd
Frequency: Daily
Performed stat? No

Geisinger Wyoming Valley Medical Center

Performing laboratory: ATL+
Technical Lead: Sarah McGowan    
Frequency: Daily    
Performed stat? No

Geisinger Shamokin Area Community Hospital

Performing laboratory: Chemistry
Technical Lead: Anthony Cole    
Frequency: Monday-Friday. Call to be scheduled (800-695-6491)    
Performed stat? No

Geisinger Bloomsburg Hospital

Performing laboratory: Chemistry
Technical Lead: Robyn Stokes  
Frequency: Daily    
Performed stat? No

Geisinger Community Medical Center

Performing laboratory: Chemistry
Technical Lead: Ann Mack, Deborah Dempsey  
Frequency: Daily    
Performed stat? No

Geisinger Lewistown Hospital

Performing laboratory: Chemistry
Technical Lead: Melissa Forsythe  
Frequency: Daily, all shifts    
Performed stat? Yes

Geisinger Jersey Shore Hospital

Performing laboratory: Chemistry
Technical lead: Brenda Shuman-Johnson    
Frequency: Daily, 1st shift    
Performed stat? Yes
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