II. Indications

III. Protocol

  1. Fasting patient ingests 100 gram oral Glucose drink (e.g. Glucola Drink)
  2. Blood Glucose measured at 4 times
    1. Fasting baseline before oral Glucose
    2. Hour 1 after oral Glucose
    3. Hour 2 after oral Glucose
    4. Hour 3 after oral Glucose

IV. Interpretation

  1. Diagnosis suggestive of Gestational Diabetes
    1. Two or more values below are abnormal
    2. Carpenter and Coustan guidelines are the standard of care now
      1. Replaces the NDDG guidelines which were 10 points higher than these
  2. Carpenter and Coustan Abnormal Value cut-offs
    1. Fasting Glucose > 95 mg/dl (5.3 mmol/L)
    2. Glucose at 1 hour > 180 mg/dl (10.0 mmol/L)
    3. Glucose at 2 hours > 155 mg/dl (8.6 mmol/L)
    4. Glucose at 3 hours > 140 mg/dl (7.8 mmol/L)
  3. References
    1. Carpenter (1982) Am J Obstet Gynecol 144:768-73 [PubMed]

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Ontology: Measurement of glucose 3 hours after glucose challenge for glucose tolerance test (C0202050)

Definition (ALT) Analyzing a client/patient's blood sample to determine his or her blood glucose levels. Use DEABZ in conjunction with DEACS or DEACT. For a 4-hour test, use DEACU or DEACV. Service is billed per test.
Concepts Laboratory Procedure (T059)
SnomedCT 13165004
English Measurement of glucose 3 hours after glucose challenge for glucose tolerance test (procedure), Measurement of glucose 3 hours after glucose challenge for glucose tolerance test, Glucose tolerance test, 3 hours (procedure), Glucose tolerance test, 3 hours, 3 hour glucose tolerance test, 3 hours glucose tolerance test, 3 glucose hour testing tolerance, Glucose tolerance 3-hour test each test, GTT 3-hour tst ea.tst
Spanish medición de glucosa 3 horas después de la administración de glucosa para la prueba de tolerancia a la glucosa, prueba de tolerancia a la glucosa, 3 horas, medición de glucosa 3 horas después de la administración de glucosa para la prueba de tolerancia a la glucosa (procedimiento), prueba de tolerancia a la glucosa, 3 horas (procedimiento)