ARUP's Laboratory Test Directory

Glucose Tolerance Test, Pregnancy : 0020543

Mnemonic: GTT PRG

Methodology: Quantitative Enzymatic
Performed: Sun-Sat
Reported: Within 24 hours
Specimen Required: Patient Prep: Patient should fast for at least eight hours prior to collection of specimens.

Collect: Collect 4 timed specimens (fasting, 60, 120, and 180 minutes). Gray (sodium fluoride/potassium oxalate). Collect separate tube for each timed specimen.

Specimen Preparation: Separate plasma from cells within 2 hours of collection. Transport 1 mL plasma per time point. (Min: 0.2 mL per time point)

Storage/Transport Temperature: Refrigerated.

Stability (collection to initiation of testing): Ambient: 24 hours; Refrigerated: 1 week; Frozen: 1 year
Reference Interval:
Glucose (fasting, 60, 120, 180 min). Levels vary with initial conditions; interpretation available on consultation with medical director.
Note: Administer 100 g glucola. Do not mix with water unless directions on product label indicate to do so. The patient should be fasting for at least eight hours prior to start of test, should remain inactive, and receive nothing by mouth (including tobacco) during test period. A small sip of water or ice is permissible. Reasons for invalid results include emesis and conditions which delay stomach emptying.
CPT Code(s): 82951 Tolerance test, three specimens (includes fasting glucose); 82952 Tolerance test, each additional beyond three specimens
Cross References: GLU (Glucose Tolerance Test, Pregnancy)
 
 

 

 

 
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