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Test Code GTT2HR Glucose Tolerance, 2 Hour, Plasma

Important Note

Call St. Clair Hospital Laboratory at 412-942-3885 for draw instructions.

Methodology

Hexokinase, Ultraviolet (UV)

Performing Laboratory

St. Clair Hospital Laboratory

Specimen Requirements

1 mL of Lithium Heparin plasma

  • Preferred Specimen:  Light Green Plasma Seperator Tube (PST) 
  • Acceptable Specimen: Dark Green Lithium Heparin tube

Centrifuge blood as soon as possible, or send unspun blood to laboratory within 4 hours of draw. Avoid hemolysis. Protect specimen from light.
Note:  Do not uncap tube once specimen is drawn.

 

Reference Values

65-99 mg/dL (fasting)
<140 mg/dL (2 hour)

 

CRITERIA FOR DIAGNOSIS OF DIABETES MELLITUS
1. Symptoms of diabetes mellitus and any of the following on 2 different days during the oral glucose tolerance test as per World Health Organization specifications:
≥200 mg/dL (casual plasma glucose)
≥126 mg/dL (fasting plasma glucose)
≥200 mg/dL (2 hour plasma glucose)
2. Acute metabolic decompensation with hyperglycemia
145 mg/dL (3 hour)
IMPAIRED GLUCOSE TOLERANCE
100-125 mg/dL (fasting)
140-199 mg/dL (2 hour)

Day(s) Test Set Up

Monday through Saturday