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Glucose Tolerance Test (1 Hr/50g) Gestational - Non -Fasting

Important Note

Fasting is not required.

Additional Codes

Epic# -

LAB5712

 

Cerner name(s):

  • GTT 50 gram 1hr gestational screen or Glucose Tolerance testing 50 gram 1hr gestational screen

Performing Lab(s)

Memorial-Belleville & Memorial-Shiloh

Specimen Requirement (s)

Specimen Type: plasma (preferred) or serum

Container/Tube:   mint green LiHep tube, SST (gold or marble), plain red top, lavender (EDTA) tube

Specimen Volume:    full tube

Specimen Minimum Volume: 1 mL of plasma

 

Collection Instructions:

  1. Give patient 50 g glucose tolerance beverage (or acceptable substitute as determined by lab or physician)
  2. Draw  specimen at 1 hour post consumption of beverage.

Unacceptable Conditions

Avoid hemolysis. 

Day(s)/Shift(s) Test Set Up and Turnaround Time

Sunday through Saturday

Hours: 24 hours

 

Turnaround Time:

STAT: No

Routine: less than 8 hours from receipt.

Transport and Stability

Transport temperature: Ambient to lab

Reference Values

Non-Fasting 1 Hour (1H/50g)

Reference Values

Critical Low

Critical High

≤ 140 mg/dL

≤ 54 mg/dL

≥ 450 mg/dL

CPT/LOINC Codes

82950

Interpretive Data

Interpretive Data

Used for suspected gestational diabetes. The screeningtest uses 50 grams of glucose with sample obtained 1 hr later.

Normal range: < 140 mg/dL.

A glucose value of >140 mg/dL generally indicates the need for a full diagnostic tolerance test.

Reference Interval Info:

Diabetes Care 2005, Vol 28. Supplement 1,S37-S42. Report of the Expert Committee on the Diagnosis and Classification of Diabetes Mellitus. Diabetes Care 2020; 43(Supplement 1):S14-31.