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GLUCOSE, OB SCREEN, 1 HOUR

For patient preparation instructions, refer to Glucose Tolerance Tests-Patient Preparation Instructions.

Mnemonic

GLU SCREEN

Synonym

1 Hour OB Oral Glucose Tolerance Test - OGTT - GTT

Includes

1 hour glucose post 50 gram load glucola

Guidelines

This is a screening test for Gestational Diabetes at 24-28 weeks gestation.

Specimen Collection Requirements

Patient Preparation

Patient does not need to fast. Administer 50 gram load of glucola. Collect specimen 1 hour after consumption of glucola beverage.

Collect

Preferred: Plasma, one 4.0 mL gray (sodium fluoride/potassium oxalate) top tube, also acceptable: Serum or plasma, one 5.0 mL gold (SST), 7.0 mL red or 3.0 mL mint green (lithium heparin, PST) top tube

View image for Supply Item Number - 352002

Handling

The gold, red and green top tubes must be delivered to the lab immediately. Allow serum to clot completely at room temperature (minimum: SST - 30 minutes and red top tubes - 60 minutes). Preferably, separate serum or plasma from cells within 1 hour of collection. If unable to spin, preferred specimen is gray (sodium fluoride/potassium oxalate) top tube.

Preferred Volume

1.0 mL Serum/Plasma

Minimum Volume

0.25 mL Serum/Plasma (0.60 mL minimum whole blood draw)

Transport

Refrigerated (2-8°C)

Rejection Criteria

Grossly hemolyzed specimens, timed specimens collected outside the ±10 minute window

Stability

AFTER SEPARATION FROM CELLS:

SODIUM FLUORIDE/POTASSIUM OXALATE PLASMA: Room Temperature (18-26°C): 24 hours; Refrigerated (2-8°C): 7 days; Frozen (≤ -20°C): 1 month

SERUM OR LITHIUM HEPARIN PLASMA: Room Temperature (18-26°C): 8 hours; Refrigerated (2-8°C): 3 days; Frozen (≤ -20°C): 1 month

Testing Information

Performed

Schedule testing with one of the approved Legacy Facilities. Please refer to Glucose Tolerance Tests-Patient Preparation Instructions.

Reported

24 hours

Method

UV spectrophotometry

Reference Values

Reference Values

CPT Codes

82950

Last Updated: Wednesday, May 24, 2017 11:43:48 AM


Client Services: 503-413-1234