Glucose, Gestational Screen (50g), 135 Cutoff
Use
A value of 135 mg/dL or greater indicates the need for a full diagnostic, gestational glucose tolerance performed in the fasting state to determine if the patient has gestational diabetes.
Special Instructions
The patient is given a 50 g dose of glucose and a single blood specimen is obtained one hour later. Fasting is not required. The test should be performed between weeks 24 and 28 of gestation.
Limitations
Glucose levels may be depressed if sample is left on clot for an excessive length of time.
Methodology
Automated Analyzer (Clinical Chemistry)
Biomarkers
Result Turnaround Time
1 day
Related Documents
For more information, please review the documents below
Specimen
Plasma
Volume
1 mL
Minimum Volume
0.5 mL
Container
Fluoride‑oxalate (gray‑top) tube
Collection Instructions
The patient is given a 50 g dose of glucose and a single blood specimen is obtained one hour later. Plasma submissions must be separated from cells.
Patient Preparation
Fasting is not required.
Causes for Rejection
Whole blood frozen unacceptable; hemolysis; use of incorrect tube types (e.g., red top, SST, non‑fluoride tubes)
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 7 days (plasma) |
| Refrigerated | 7 days (plasma) |
| Frozen | 28 days (plasma) |