Glucose Tolerance Test, 3 Hr Gestational

CERNER / EPIC MNEMONIC: GTT-3 HR
POE DESCRIPTION: GLUCOSE TOLERANCE 3 HR; GTT-3 HR
CPT CODE: 82952 (x2)
DAYS PERFORMED: Specimen accepted daily, 24 hours
TURNAROUND TIME: 8 hours
SPECIAL INSTRUCTIONS: See Patient Instructions for Glucose Tolerance Test,¿A fasting glucose level is drawn from the patient.¿The patient (at 24-28 weeks of gestation) is given orally a 100 gram solution of glucose.¿The patient's blood is drawn again at 1 hour, 2 hours and 3 hours after the administration of glucose for a glucose assay.
CONTAINER TYPE: Gray top (sodium fluoride) tube
SPECIMEN REQUIREMENTS: Blood (plasma)
MINIMUM VOLUME: 2 mL blood (1 mL plasma)
HANDLING INSTRUCTIONS: Refrigerate
REFERENCE RANGE: Interpretive information (after 100 g glucose challenge at 24-28 weeks of gestation): Any two of four glucose values meeting or exceeding the limits below is indicative of gestational diabetes mellitus:

GTT FASTING 95 mg/dL

GTT 1 HR 180 mg/dL

GTT 2 HR 155 mg/dL

GTT 3 HR 140 mg/dL

Reference: Diabetes Care, 3 0(7Supp.1), S42-S47 (2007).

CRITICAL VALUES: <40, >500
TEST SYNONYM(S):Oral Glucose Tolerance Test; Gestational GTT