50 gram, non-fasting, 1-hour, gestational glucose screen




Test Mnemonic

GLTGST

CPT Codes

  • 82950 - QTY (1)

LOINC ®

2345-7

Performing Laboratory

n/a


Specimen Requirements

Volume Type Container Collect Temperature Transport Temperature Special Instructions
1 mLPlasmaPotassium oxalate/sodium fluoride (Gray) Centrifuge and refrigerate.Aliquot into CCL aliquot tube

Minimum Specimen Requirements

Volume Type Container Collect Temperature Transport Temperature Special Instructions
0.3 mL     

Stability

Environmental Condition Description
Ambient24 hours
RefrigeratedAfter removed from cells: 72 hours
FrozenUnacceptable

Days Performed

Sun - Sat

Turnaround Time

8 hours

Methodology

Name Description
Glucose Hexokinase 

Reference Range

Glucose Screen, Pregnancy
Sex Age From Age To Type Range Range Unit
       Normal74-134mg/dL
   Years99 YearsUrgent> 500mg/dL
       UrgentInpatient only: 40-49 mg/dL (First result only, once every 24 hours.)mg/dL
   Years99 YearsCritical< 40mg/dL

Special Info

Patient does not need to fast. Administer 50 gm of Dextrose within 5 minutes. Collect 1 hour post administration.

Clinical Info

Screening for Gestational Diabetes Mellitus American Congress of Obstetricians and Gynecologists (Carpenter/Coustan) guidelines state a gestational diabetes mellitus positive screen is made, in women not previously diagnosed with overt diabetes, when the 1 hr plasma glucose level is equal to or above 140 mg/dL. The Cleveland Clinic Ob/Gyn and Women’s Health Institute recommends a 135 mg/dL cut-off.

Technical Brief