Laboratory Services

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, SST

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