Glucose tolerance test

The glucose tolerance test (GTT, not to be confused with GGT test) is a medical test in which glucose is given and blood samples taken afterward to determine how quickly it is cleared from the blood.[1] The test is usually used to test for diabetes, insulin resistance, impaired beta cell function,[2] and sometimes reactive hypoglycemia and acromegaly, or rarer disorders of carbohydrate metabolism. In the most commonly performed version of the test, an oral glucose tolerance test (OGTT), a standard dose of glucose is ingested by mouth and blood levels are checked two hours later.[3] Many variations of the GTT have been devised over the years for various purposes, with different standard doses of glucose, different routes of administration, different intervals and durations of sampling, and various substances measured in addition to blood glucose.

Glucose tolerance test
A diagram of glucose metabolism
Purposedetermine how quickly glucose is cleared from blood

History

The glucose tolerance test was first described in 1923 by Jerome W. Conn.[4]

The test was based on the previous work in 1913 by A. T. B. Jacobson in determining that carbohydrate ingestion results in blood glucose fluctuations,[5] and the premise (named the Staub-Traugott Phenomenon after its first observers H. Staub in 1921 and K. Traugott in 1922) that a normal patient fed glucose will rapidly return to normal levels of blood glucose after an initial spike, and will see improved reaction to subsequent glucose feedings.[6][7]

Testing

Since the 1970s, the World Health Organization and other organizations interested in diabetes agreed on a standard dose and duration.[8]

Preparation

The patient is instructed not to restrict carbohydrate intake in the days or weeks before the test.[9] The test should not be done during an illness, as results may not reflect the patient's glucose metabolism when healthy. A full adult dose should not be given to a person weighing less than 42.6 kg (94 lb), or the excessive glucose may produce a false positive result. Usually the OGTT is performed in the morning as glucose tolerance can exhibit a diurnal rhythm with a significant decrease in the afternoon. The patient is instructed to fast (water is allowed) for 8–12 hours prior to the tests. Medication such as large doses of salicylates, diuretics, anticonvulsants, and oral contraceptives affect the glucose tolerance test.[10]

Procedure
  1. A zero time (baseline) blood sample is drawn.
  2. The patient is then given a measured dose (below) of glucose solution to drink within a 5-minute time frame.
  3. Blood is drawn at intervals for measurement of glucose (blood sugar), and sometimes insulin levels. The intervals and number of samples vary according to the purpose of the test. For simple diabetes screening, the most important sample is the 2 hour sample and the 0 and 2 hour samples may be the only ones collected. A laboratory may continue to collect blood for up to 6 hours depending on the protocol requested by the physician.

Dose of glucose and variations
  • 75 g of oral dose is the recommendation of the WHO to be used in all adults,[11] and is the main dosage used in the United States.[12] The dose is adjusted for weight only in children.[11] The dose should be drunk within 5 minutes.
  • A variant is often used in pregnancy to screen for gestational diabetes, with a screening test of 50 g over one hour. If elevated, this is followed with a test of 100 g over three hours.[12]
  • In UK general practice, the standard glucose load was provided by 394 ml of the energy drink Lucozade with original carbonated flavour, but this is being superseded by purpose-made drinks.[13][14]

Substances measured and variations

If renal glycosuria (sugar excreted in the urine despite normal levels in the blood) is suspected, urine samples may also be collected for testing along with the fasting and 2 hour blood tests.[15]

Results
  • Fasting plasma glucose (measured before the OGTT begins) should be below 5.6 mmol/L (100 mg/dL). Fasting levels between 5.6 and 6.9 mmol/L (100 and 125 mg/dL) indicate prediabetes ("impaired fasting glucose"), and fasting levels repeatedly at or above 7.0 mmol/L (>126 mg/dL) are diagnostic of diabetes.[12]
  • For a 2 hour GTT with 75 g intake, a glucose level below 7.8 mmol/L (140 mg/dL) is normal, whereas higher levels indicate hyperglycemia. Blood plasma glucose between 7.8 mmol/L (140 mg/dL) and 11.1 mmol/L (200 mg/dL) indicate "impaired glucose tolerance", and levels at or above 11.1 mmol/L at 2 hours confirm a diagnosis of diabetes.[12]

For gestational diabetes, the American College of Obstetricians and Gynecologists (ACOG) recommends a two-step procedure, wherein the first step is a 50 g glucose dose.[12][16] If after 1 hour the blood glucose level is more than 7.8 mmol/L (140 mg/dL),[12] it is followed by a 100 g glucose dose.[12] The diagnosis of gestational diabetes is then defined by a blood glucose level meeting or exceeding the cutoff values on at least two intervals,[12] with cutoffs as follows:[12]

  • Before glucose intake (fasting): 5.3 mmol/L (95 mg/dL)
  • 1 hour after drinking the glucose solution: 10.0 mmol/L (180 mg/dL)
  • 2 hours: 8.6 mmol/L (155 mg/dL)
  • 3 hours: 7.8 mmol/L (140 mg/dL)

Sample method

The diagnosis criteria stated above by the World Health Organization (WHO) are for venous samples only (a blood sample taken from a vein in the arm). An increasingly popular method for measuring blood glucose is to sample capillary or finger-prick blood, which is less invasive, more convenient for the patient and requires minimal training to conduct. Though fasting blood glucose levels have been shown to be similar in both capillary and venous samples, postprandial blood glucose levels (those measured after a meal) can vary. The diagnosis criteria issued by the WHO are only suitable for venous blood samples. Given the increasing popularity of capillary testing, the WHO has recommended that a conversion factor between the two sample types be calculated, but as of 2017 no conversion factor had been issued by the WHO, despite some medical professionals adopting their own.

Variations

A standard two-hour GTT (glucose tolerance test) is sufficient to diagnose or exclude all forms of diabetes mellitus at all but the earliest stages of development.

Longer tests have been used for a variety of other purposes, such as detecting reactive hypoglycemia or defining subsets of hypothalamic obesity. Insulin levels are sometimes measured to detect insulin resistance or deficiency.[17]

The GTT (glucose tolerance test) is of limited value in the diagnosis of reactive hypoglycemia, since normal levels do not preclude the diagnosis, abnormal levels do not prove that the patient's other symptoms are related to a demonstrated atypical OGTT, and many people without symptoms of reactive hypoglycemia may have the late low glucose.[18]

Oral glucose challenge test

The oral glucose challenge test (OGCT) is a short version of the OGTT, used to check pregnant women for signs of gestational diabetes.[3][19] It can be done at any time of day, not on an empty stomach.[3] The test involves 50 g of glucose, with a reading after one hour.[3]

Limitations of OGTT

The OGTT does not distinguish between insulin resistance in peripheral tissues and reduced capacity of the pancreas beta-cells to produce insulin. The OGTT is less accurate than the hyperinsulinemic-euglycemic clamp technique (the "gold standard" for measuring insulin resistance), or the insulin tolerance test, but is technically less difficult. Neither of the two technically demanding tests can be easily applied in a clinical setting or used in epidemiological studies. HOMA-IR (homeostatic model assessment) is a convenient way of measuring insulin resistance in normal subjects, which can be used in epidemiological studies, but can give erroneous results for diabetic patients.[20][21]

References
  1. Glucose+Tolerance+Test at the US National Library of Medicine Medical Subject Headings (MeSH)
  2. DeFronzo RA, Abdul-Ghani M (2011). "Assessment and treatment of cardiovascular risk in prediabetes: impaired glucose tolerance and impaired fasting glucose". American Journal of Cardiology. 108 (3 Suppl): 3B–24B. doi:10.1016/j.amjcard.2011.03.013. PMID 21802577.
  3. Institute for Quality and Efficiency in Health Care. "Glucose tolerance test: how does it work exactly?". Informed Health Online. Institute for Quality and Efficiency in Health Care. Retrieved 22 June 2013.
  4. Conn, JW. (1940). "Interpretation of the glucose tolerance test. The necessity of a standard preparatory diet". Am J Med Sci. 199: 555–64. doi:10.1097/00000441-194004000-00014.
  5. "Jacobsen ATB. Untersuchungen über den Einfluss verschiedener Nahrungsmittel auf den Blutzucker bei normalen, zuckerkranken und graviden Personen. Biochem Z 1913; 56:471–94". {{cite journal}}: Cite journal requires |journal= (help)
  6. Traugott, K. (1922). "Über das Verhalten des Blutzuckerspiegels bei wiederholter und verschiedener Art enteraler Zuckerzufuhr and dessen Bedeutung für die Leberfunktion". Klin. Wochenschr. 1 (18): 892. doi:10.1007/BF01715866. S2CID 32368110.
  7. Staub, H. (1921). "Bahnung im intermediaren Zuckerstoffwechsel". Biochem. Z. 118: 93.
  8. American Diabetes Association (2013). "Standards of Medical Care in Diabetes—2013". Diabetes Care. 36 (Suppl 1): S11–S66. doi:10.2337/dc13-S011. ISSN 0149-5992. PMC 3537269. PMID 23264422.
  9. Klein, Klara R.; Walker, Christopher P.; McFerren, Amber L.; Huffman, Halie; Frohlich, Flavio; Buse, John B. (2021). "Carbohydrate Intake Prior to Oral Glucose Tolerance Testing". Journal of the Endocrine Society. 5 (5): bvab049. doi:10.1210/jendso/bvab049. PMC 8059359. PMID 33928207.
  10. Salvaggio, Heather L; Zaenglein, Andrea L (2010-08-09). "Examining the use of oral contraceptives in the management of acne". International Journal of Women's Health. 2: 69–76. doi:10.2147/ijwh.s5915. ISSN 1179-1411. PMC 2971728. PMID 21072299.
  11. World Health Organization and International Diabetes Federation (1999). Definition, diagnosis and classification of diabetes mellitus and its complications. Geneva, Switzerland: World Health Organization.
  12. American Diabetes Association (20 December 2019). "2. Classification and Diagnosis of Diabetes: Standards of Medical Care in Diabetes—2020". Diabetes Care. 43 (Supplement 1): S14–S31. doi:10.2337/dc20-S002. PMID 31862745. Retrieved 26 February 2020.
  13. Salford Royal NHS Trust. "Glucose Tolerance Tests in Primary Care". Retrieved 2012-06-20.
  14. Jane Patmore (2009). "Oral Glucose Tolerance Tests: Protocol and Guidance" (PDF). Hull and East Riding Diabetes Network, Hull NHS teaching hospitals trust. Archived from the original (PDF) on 2012-05-06. Retrieved 2012-06-20.
  15. "Glucose - Urine". ucsfhealth.org. Retrieved 2022-10-17.
  16. Committee on Practice Bulletins—Obstetrics (February 2018). "ACOG Practice Bulletin No. 190: Gestational Diabetes Mellitus". Obstetrics & Gynecology. 131 (2): e49–e64. doi:10.1097/AOG.0000000000002501. PMID 29370047. S2CID 3395229.
  17. Lv, Xue; Fang, Kun; Hao, Wenqing; Han, Yuxin; Yang, Nailong; Yu, Qing (2020-12-02). "Identification of Reactive Hypoglycemia with Different Basic BMI and Its Causes by Prolonged Oral Glucose Tolerance Test". Diabetes, Metabolic Syndrome and Obesity: Targets and Therapy. 13: 4717–4726. doi:10.2147/DMSO.S280084. ISSN 1178-7007. PMC 7719337. PMID 33293845.
  18. Pant, Vivek; Mathema, Safala; Jha, Sandeep; Paudel, Sujay Dutta; Baral, Suman (2021-12-07). "The Detection of Postprandial Hypoglycemia with 5-Hour Oral Glucose Tolerance Test". EJIFCC. 32 (4): 451–457. ISSN 1650-3414. PMC 8751404. PMID 35046763.
  19. Hartling, L; Dryden, DM; Guthrie, A; et al. (October 2012). Screening and Diagnosing Gestational Diabetes Mellitus. Evidence Reports/Technology Assessments, No. 210. Agency for Healthcare Research and Quality. pp. 1–327. PMC 4781607. PMID 24423035. Retrieved 22 June 2013.
  20. Muniyappa R, Lee S, Chen H, Quon MJ (2008). "Current approaches for assessing insulin sensitivity and resistance in vivo: advantages, limitations, and appropriate usage". American Journal of Physiology. Endocrinology and Metabolism. 294 (1): E15–E26. doi:10.1152/ajpendo.00645.2007. PMID 17957034. S2CID 848540.
  21. Antuna-Puente B, Disse E, Rabasa-Lhoret R, Laville M, Capeau J, Bastard JP (2011). "How can we measure insulin sensitivity/resistance?". Diabetes & Metabolism. 37 (5): 179–88. doi:10.1016/j.diabet.2011.01.002. PMID 21435930.
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