Glucose Tolerance Testing (GTT) 1-, 2- or 3-Hour
- GTT, 1-hour: 28084
- GTT, 2-hour: 28085
- GTT, 3-hour: 28086
- GLU1P: 82950
- GESTT: 82951
- GTT3P: 82951, 82952
Preparation: Submit specimens in their original tubes.
Sample Volume: Submit a full tube.
Minimum Volume: 0.5 mLof plasma
- Ambient: 24 hours at 15 - 25°C
- Refrigerated: 72 hours at 2 - 8°C
- Samples with moderate or marked hemolysis will be rejected.
Glucose is phosphorylated by hexokinase (HK) in the presence of adenosine triphosphate (ATP) and magnesium ions to produce glucose-6-phosphate (G-6-P) and adenosine diphosphate (ADP). Glucose-6-phosphate dehydrogenase (G6P-DH) specifically oxidizes G-6-P to 6-phosphogluconate with the concurrent reduction of nicotinamide adenine dinucleotide (NAD+) to nicotinamide adenine dinucleotide, reduced (NADH). The change in absorbance at 340/660 nm is proportional to the amount of glucose present in the sample. (Package Insert: OSR General Chemistry BAOSR6x21.04, 20143-04)
Within 24 hours
- Fasting: 65 - 99 mg/dL
- 1HR: 65 - 179 mg/dL
- 2HR: 65 - 154 mg/dL
- 3HR: 65 - 139 mg/dL
Monday - Friday