090-20-0510-01

GTT 2 & 5 hrs., DEX 100 g. (Fasting , 0.5, 1, 1.5, 2, 5 hrs.)

1. Patient should be fasting at least 8 hours. 
2. Patient can drink water as usual.
3. Patient who takes the antihypertensive drugs, can take it as usual. 

Blood/ Plain blood (Red top) 6 mL, 1 tube
and
Urine, Clean container 
* นำส่งห้องปฏิบัติการหลังจากเจาะเลือดทันที *
 

Serum, minimum volume 0.5 mL

Plastic vial

Hemolysis: 4+ reject
Lipemia: 4+ reject
Icterus: 4+ reject

Specimen Type	Temperature	Time
Serum	Refrigerated, 2oC to 8oC	7 days
	Frozen, -20oC	3 months
Random urine	Refrigerated, 2oC to 8oC	2 hours

090-20-0510-01

GTT 2 & 5 hrs., DEX 100 g. (Fasting , 0.5, 1, 1.5, 2, 5 hrs.)

 Hexokinase/ G-6-PDH

Tested daily (24 hours)

Collected specimen to report within 90 min

5 days

The OGTT evaluates how the body manages glucose after a meal. Glucose is a type of sugar produced when the body breaks down carbohydrates consumed in food. Some of the glucose will be used for energy; the rest will be stored for future use.

The amount of glucose in your blood is controlled by the hormones insulin and glucagon. If you have too much, the pancreas secretes insulin to help cells absorb and store glucose. If you have too little, the pancreas secretes glucagon so that stored glucose can be released back into the bloodstream.

Under normal circumstances, the body will be able to maintain the ideal balance of blood glucose. However, if any parts of the system are impaired, glucose can rapidly accumulate, leading to high blood sugar (hyperglycemia) and diabetes.

The OGTT is a highly sensitive test that can detect imbalances that other tests miss. The National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) recommends the OGTT for the following purposes:

Screening and diagnosis of prediabetes or impaired glucose tolerance (IGT)       
Screening and diagnosis of type 2 diabetes
Screening and diagnosis of gestational diabetes

The OGTT is only used for diagnosis and screening. It has no role in the monitoring of diabetes or prediabetes.

Among its other uses, the OGTT can be ordered to diagnose reactive hypoglycemia (in which blood sugar drops after eating), acromegaly (an overactive pituitary gland), beta cell dysfunction (in which insulin is not being secreted), and rare disorders affecting carbohydrate metabolism (such as hereditary fructose intolerance).

090-20-0510-01

GTT 2 & 5 hrs., DEX 100 g. (Fasting , 0.5, 1, 1.5, 2, 5 hrs.)

1. Manufacturer’s reagent package insert, Architect ®/Aeroset® Glucose , ABBOTT Laboratories, Abbot Park IL 60064 USA
2. http://www.diabetes.org/diabetes-basics/diagnosis (Retrieved: June 2018)
3. http://www.mayomedicallaboratories.com (Retrieved: 01 Jan 2019)
4. https://www.verywellhealth.com (Retrieve: 9 Mar 2019)