50 gram, non-fasting, 1-hour, gestational glucose screen
Test Mnemonic
GLTGST
CPT Codes
- 82950 - QTY (1)
LOINC ®
2345-7
Performing Laboratory
Cleveland Clinic Laboratories
Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 1 mL | Plasma | Potassium 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 |
|---|---|
| Ambient | 24 hours |
| Refrigerated | After removed from cells: 72 hours |
| Frozen | Unacceptable |
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 |
| Normal | 74-134 | mg/dL | Years | 99 Years | Urgent | > 500 | mg/dL | Urgent | Inpatient only: 40-49 mg/dL (First result only, once every 24 hours.) | mg/dL | Years | 99 Years | Critical | < 40 | mg/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.