Test Directory

1 Hour Glucose (OB Screen)

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Updated Test Information:

Test Description
1 Hour Glucose (OB Screen)
Synonym(s)
GTT, 1 hour, Glucose Tolerance Test
Test ID
GLUOB
Specimen Type
Serum
Alternate Specimen Type
Red, Li-heparin plasma, K2EDTA, NaF/Na2EDTA, KF/Na2EDTA, NaF/K‑Oxalate
Specimen Requirements
GTT 1H
Specimen Collection / Processing Instructions
GTT 1H - Administer 50 g glucola 1 hour prior to drawing the patient. 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 nicotine products. Small sips of water or ice is permissible.
Additional Processing Details
Plasma or serum samples without preservative (NaF) should be separated from the cells or clot within half an hour of being drawn.
Stability
8 hours at 25 °C
3 days at 4 °C

Stability in fluoride plasma: 3 days at 15‑25 °C
Methodology
UV Enzymatic
Estimated TAT
0-2 days
Testing Schedule
Monday-Saturday
CPT Code(s)
82950
Minimum Sample Volume
1 mL
Pediatric Min. Volume (if applicable)
500 uL
Performing Lab
Incyte Diagnostics
LOINC Code(s)
20438-8