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Test Code GLUF Glucose (Fasting) LAB81

Test Method

Timed Endpoint; Beckman DXC600


Testing is performed Monday through Sunday.

Routine orders: Typically completed within 4 hours after
the specimen arrives at the testing site.

Expedite: Typically completed within 1 hour after the
specimen arrives at the testing site.

STAT: Typically completed within 30 minutes after the specimen
arrives at the testing site.

Useful For

Diagnosing and managing diabetes mellitus and other carbohydrate
metabolism disorders including gestational diabetes, neonatal
hypoglycemia, idiopathic hypoglycemia, and pancreatic islet cell

Specimen Requirement

0.5 mL serum or plasma is required.

CPT Code Information

82947 Chemistry: Glucose Testing Glucose;
quantitative, blood (except reagent strip)

Reference Values

Newborn (whole blood or plasma): 50-99 mg/dL

1 Month to Adult (serum, plasma or whole blood): 70-99

  • Critical values:

    • Low: < 50 mg/dL
    • High: > 450 mg/dL

LOINC Code Information

1554-5 Glucose [Mass/Volume] In Serum Or Plasma-12 Hours

Additional Specimen Collection Information

Collect blood in a lithium heparin, green-top or red-top tube
from a fasting patient. (12 hour fast is recommended.) PST and SST
(gel tubes) are acceptable. Serum or plasma should be separated
from contact with the cells within 2 hours of collection. Specimens
not centrifuged within 4 hours of collection may be rejected.
Refrigerate the specimen if unable to assay within 8 hours of
collection. Hemolyzed specimens are not acceptable. Samples with
≥3+ lipemia must be cleared prior to analysis.