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Test Code GEST GLU Gestational Glucose Test

Additional Codes

GESTATIONAL GLUCOSE TEST, 1HR [LAB1786], GESTATIONAL GLUCOSE TEST, 2HR [LAB88],

GESTATIONAL GLUCOSE TEST, 3HR [LAB2598] 

Patient Preparation

Fasting

Collection Method

Venous collection

Minimum Volume

0.5ml

Container

Grey Top / Sodium Fluoride Potassium Oxalate

Acceptable Specimens

Serum:

  • Gold Top SST
  • Red Top


Plasma:

  • Light Geen Top (lithium heparin)
  • Grey Top(Sodium Fluoride/Potassium Oxalate)

Reference or Target Ranges

Normal Range

Time Normal 
Fasting Less than 95 mg/dl
1 hour glucose Less than 180 mg/dl
2 hour glucose Less 155 mg/dl
3 hour glucose Less than 140 mg/dl

 

To make a diagnosis of GDM, at least two of the following plasma glucose values must be found:

Time GDM CRITERIA
Fasting Greater than or equal to 95 mg/dl
1 hour glucose Greater than or equal to 180 mg/dl
2 hour glucose Greater than or equal to 155 mg/dl
3 hour glucose Greater than or equal to 140 mg/dl

Reportable Units

mg/dl

Critical Value

< 50 mg/dl

> 500 mg/dl

Reasons for Rejection

Hemolysis Threshold 1000 mg/dL
Icterus Threshold 60 mg/dL
Lipemia Threshold 1000 mg/dL
Other QNS, contaminated, improperly Labeled, improper specimen type

Specimen Stability

Ambient 8 hours
Refrigerated (4°C to 8°C) 72 hours
Frozen(-40°C to 0°C) N/A

Performance Information

Days and Time Performed 24/7
Expected Turn Around Time Stat: 1 hour
Routine: 4 hours
Stat Availability Yes
Performing Bench CPH Chemistry
Methodology/Method Description Roche Cobas

CPT Codes

82950, 82951

Last review/edit date

March 2024