Ordering RecommendationRecommendations when to order or not order the test. May include related or preferred tests.
MnemonicUnique test identifier.
GTT PRG
MethodologyProcess(es) used to perform the test.
Quantitative Enzymatic
PerformedDays of the week the test is performed.
Sun-Sat
ReportedExpected turnaround time for a result, beginning when ARUP has received the specimen.
Within 24 hours
New York DOH Approval StatusIndicates test has been approved by the New York State Department of Health.
This test is New York DOH approved.
Specimen Required
Patient Preparation
Patient should fast for at least eight hours prior to collection of specimens.
Collect
Collect 4 timed specimens (fasting, 60, 120, and 180 minutes). Gray (sodium fluoride/potassium oxalate). Collect separate tube for each timed specimen.
Specimen Preparation
Separate plasma from cells within 2 hours of collection. Transport 1 mL plasma per time point. (Min: 0.2 mL per time point)
Storage/Transport Temperature
Refrigerated.
Unacceptable Conditions
Remarks
Stability
Ambient: 24 hours; Refrigerated: 1 week; Frozen: 1 year
Reference IntervalNormal range/expected value(s) for a specific disease state. May also include abnormal ranges.
Glucose (fasting, 60, 120, 180 min). Levels vary with initial conditions; interpretation available on consultation with medical director.
Interpretive DataBackground information for test. May include disease information, patient result explanation, recommendations, details of testing, associated diseases, explanation of possible patient results.
Interpretive limits for glucose tolerance testing vary based on population, glucose dose, and time of collection after glucose administration. Published guidelines from the American Diabetes Association or the American Congress of Obstetricians and Gynecologists should be consulted for interpretive values.
Compliance Category
FDA
NoteAdditional information related to the test.
Administer 100 g glucola. Do not mix with water unless directions on product label indicate to do so. The patient should be fasting for at least eight hours prior to start of test, should remain inactive, and receive nothing by mouth (including tobacco) during test period. A small sip of water or ice is permissible. Reasons for invalid results include emesis and conditions which delay stomach emptying.
Hotline History
N/A
CPT CodesThe American Medical Association Current Procedural Terminology (CPT) codes published in ARUP's Laboratory Test Directory are provided for informational purposes only. The codes reflect our interpretation of CPT coding requirements based upon AMA guidelines published annually. CPT codes are provided only as guidance to assist clients with billing. ARUP strongly recommends that clients confirm CPT codes with their Medicare administrative contractor, as requirements may differ. CPT coding is the sole responsibility of the billing party. ARUP Laboratories assumes no responsibility for billing errors due to reliance on the CPT codes published.
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
AliasesOther names that describe the test. Synonyms.
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