Gestational Glucose Tolerance Test

Test Code

GTTGES

CPT Codes
82951; 82952

Includes

Fasting glucose level and glucose measurements at 1 hour, 2 hours and 3 hours after tolerance drink

Preferred Specimen

4 Serum (gold top tube) specimens, drawn at Fasting, 1-hour post tolerance drink, 2-hour post tolerance drink and 3-hour post tolerance drink

Minimum Volume

0.5 mL per tube

Other Acceptable Specimens

4 Lithium Heparin Plasma (green top tube) specimens, drawn at time intervals listed above

Instructions

Draw fasting specimen before tolerance drink, then draw specimens at 1 hour, 2 hours and 3 hours after tolerance drink

Transport Container

Serum (gold top) tube or Lithium Heparin Plasma (green top) tube

Transport Temperature

Refrigeration or Room Temperature

Specimen Stability

Room Temperature - 24 hours; Refrigerated - 7 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Quantity Not Sufficient, IV contamination

Methodology
Colorimetric

Setup Schedule

Daily upon receipt

Report Available

Upon completion of analysis

Reference Range

Fasting Glucose:     65 - 105 mg/dL
1 Hour Glucose:      < 140 mg/dL
2 Hour Glucose:      < 140 mg/dL
3 Hour Glucose:      65-105 mg/dL

Clinical Significance

Gestational diabetes occurs in pregnant women who have never been diagnosed with diabetes until pregnancy. Although the mother may not continue to have diabetes after delivery, it is important to screen pregnant women for gestational diabetes due to the risks posed to the baby in utero as well as after birth. Gestational diabetes can cause high blood glucose levels in the womb, increased fetal weight gain, damage to the baby's sholders during birth, and increased risk for the baby to develop breathing problems, obesity and diabetes later in life.

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.