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Test Code HGT2 Glucose Tolerance Test (OGTT), 2 hour

Important Note

Due to specimen stability requirements, this test cannot be collected at sites other than St Joseph Hospital.  Please ask patients to come to the hospital lab for their specimen collection.

Additional Codes

EPIC:  O516195

Methodology

Oxygen Rate Method

Standardized oral glucose tolerance test used to help diagnose diabetes mellitus.  

Performing Laboratory

St. Joseph Hospital

Specimen Requirements

This procedure must be scheduled in advance.  Call St. Joseph Hospital Lab at 603-598-3323 to schedule test.

Fasting (12 hrs) is required for this test.

 

Preferred:

Plasma

Draw blood in a light green-top (lithium heparin PST) or gray top (potassium oxalate/sodium fluoride) tube(s). (Hemolyzed specimen is not acceptable.) Spin down, separate plasma from cells within 2 hours of collection, and send 1 mL of plasma refrigerated.

Note:  Label specimen as “plasma”.

 

Acceptable:

Serum

Draw blood in a plain, red-top tube(s) or a serum gel tube(s). (Hemolyzed specimen is not acceptable.) Spin down, separate serum from cells within 2 hours of collection, and send 1 mL of serum refrigerated.

Note:  Label specimen as “serum”

 

Reference Values

2 hr plasma glucose value:

Low Risk:  < 140 mg/dL

Pre-diabetes:  140-199 mg/dL 

Diabetes:  > 200 mg/dL

(American Diabetes Association criteria 2015)

Day(s) Test Set Up

Monday through Saturday

Test Classification and CPT Coding

82952