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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, 4.0 mL gray (sodium fluoride/potassium oxalate) top tube, for each collection. Also acceptable: serum or plasma, 5.0 mL gold (SST), 7.0 mL red or 3.0 mL mint green (lithium heparin, PST) top tube. DO NOT MIX SPECIMEN TYPES.

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. Gray top tubes must be spun, and plasma separated from cells within 24 hours.

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

UNSPUN (WHOLE BLOOD): Refer to Handling section above.

 

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

Refer to Glucose Tolerance Reference Ranges

CPT Codes

82950

Last Updated: Sunday, August 16, 2020 05:27:14 PM

Client Services: 503-413-1234