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Test Code GTTG1 GLUCOSE TOLERANCE, PREGNANT, 1 HR

Important Note

To be used as a screening test for gestational diabetes in pregnant patients only.

Patient should be 2 hr post-prandial.

Methodology

Automated Chemistry Analyzer

Specimen Requirements

Serum or Plasma

Container: SST tube or Lithium heparin plasma (green top tube)

Specimen Collection: 1 mL (minimum 0.5 mL)

  1. Collect specimen 1 hour after 50 gram glucose load.
  2. Allow specimen to clot completely if a serum (SST) was used for the draw.
  3. Separate serum (SST) or plasma (Lithium Heparin) from cells within 24 hours and transport refrigerated. If a red top tube is collected, separate serum from cells within 2 hours and place in separate plastic tube and cap immediately.
  4. Properly label specimen with patient's name, DOB, requisition number and type of tube drawn i.e. GREEN.

Alternate Specimens: Gray top (Sodium Fluoride)

Specimen Transport/Stability

Refrigerated: 24 hours on gel, 7 days poured off

Specimen Rejection

1.  Clotted specimen

2.  Exceeding stability requirements

3. Unlabeled specimen

Maximum Laboratory Time

24 - 48 hours

Reference Ranges

Glucose Challenge, 1 Hour                     mg/dL
                    < 140

  

Day(s) Test Set Up

Daily

Test Classification and CPT Coding

82950