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Test Code GEST GLU Gestational Glucose Test

Additional Codes

GESTATIONAL GLUCOSE, FASTING [LAB2597], GESTATIONAL GLUCOSE TEST, 1HR [LAB1786], GESTATIONAL GLUCOSE TEST, 2HR [LAB88], GESTATIONAL GLUCOSE TEST, 3HR [LAB2598] 

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

1 HR GESTATIONAL

 

1 HR  65-129 mg/dL

 

According to the American Diabetes Association, a 1-hour plasma glucose ≥130 mg/dL after a 50g glucola load warrants a 100g glucose tolerance test.

 

2 HR GESTATIONAL

 

FASTING 65-91 mg/dL
1 HR 65-179 mg/dL
2 HR 65-152 mg/dL

 

According to the American Diabetes Association, the diagnosis of Gestational Diabetes Mellitus is made when any of the following plasma glucose values are met or exceeded:
       •  Fasting: 92 mg/dL
       •  1 hour: 180 mg/dL
       •  2 hour: 153 mg/dL

 

3 HR GESTATIONAL

 

FASTING 65-94 mg/dL
1 HR 65-179 mg/dL
2 HR 65-154 mg/dL
3 HR 65-139 mg/dL

 

According to the American Diabetes Association, the diagnosis of Gestational Diabetes Mellitus is made when at least two of the following four plasma levels are met or exceeded:
          •  Fasting: 95 mg/dL
          •  1 hour: 180 mg/dL
          •  2 hour: 155 mg/dL
          •  3 hour: 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

2025

Patient Preparation

Fasting