Glucose Screen, Pregnancy
Also known as: GSCN
Use
This test serves as a screening measure for gestational diabetes in pregnant patients. Values exceeding 140 mg/dL constitute a positive screen and should be followed by a diagnostic three‑hour oral glucose tolerance test (Glucose Tolerance Test, Pregnancy 0020543).
Special Instructions
Not provided.
Limitations
Positive screens (>140 mg/dL) require follow‑up with a diagnostic test; conditions that delay gastric emptying or cause emesis may invalidate results.
New York Approved
Methodology
Automated Analyzer (Clinical Chemistry)
Biomarkers
Glucose
Analyte
LOINC Codes
- 1504-0 - Glucose 1h p 50 g Glc PO SerPl-mCnc
Result Turnaround Time
Not provided.
Related Documents
For more information, please review the documents below
Specimen
Plasma
Volume
1 mL
Minimum Volume
0.2 mL
Container
Gray (sodium fluoride/potassium oxalate)
Collection Instructions
Collect at 60 minutes post‑glucose load.
Patient Preparation
Administer 50 g glucola; patient should remain inactive and fast only from substances including tobacco; water or ice sip permissible.
Storage Instructions
Separate plasma from cells within 24 hours.
Causes for Rejection
Conditions that delay stomach emptying or emesis; improper specimen handling or timing.
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | Ambient: 24 hours |
| Refrigerated | 1 week |
| Frozen | 1 year |
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