ARUP's Laboratory Test Directory

Glucose Screen, Pregnancy : 0020047

Mnemonic: GSCN

Methodology: Quantitative Enzymatic
Performed: Sun-Sat
Reported: Within 24 hours
Specimen Required: Patient Prep: Collect at 60 minutes post-glucose load.

Collect: Gray (sodium fluoride/potassium oxalate).

Specimen Preparation: Separate plasma from cells within 24 hours. Transport 1 mL plasma. (Min: 0.2 mL)

Storage/Transport Temperature: Refrigerated.

Stability (collection to initiation of testing): After separation from cells: Ambient: 24 hours; Refrigerated: 1 week; Frozen: 1 year
Reference Interval:
Values > 140 mg/dL constitute a positive screen.  Positive screens on pregnant patients should be followed by a diagnostic three-hour oral glucose tolerance test (Glucose Tolerance Test, Pregnancy 0020543).
Note: Administer 50 g glucola. Do not mix with water unless directions on product label indicate to do so. The patient does not need to be fasting for the screen. During the test period, the patient should remain inactive and receive nothing by mouth (including tobacco); a small sip of water or ice is permissible. Reasons for invalid results include emesis and conditions that delay stomach emptying.
CPT Code(s): 82950
Cross References: GLU (Glucose Screen, Pregnancy)