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Glucose, serum or plasma (087-0039)
Test Mnemonic:

GLU for serum or plasma

Specimen Requirements:


Do not draw specimen from an arm receiving intravenous transfusion. 

Serum separator tube (SST) (Preferred), Plasma separator tube (PST), red stopped vacutainer tube or gray top tube.

Minimum Volume:

3 mL of blood


Delivered to Sample Management within 2 hours of collection.

Specimen Preparation:


Allow specimen to clot completely at room temperature. Centrifuge to separate serum from cells within 2 hours of collection. Transfer serum from red-topped or gray-topped tube to labeled plastic transport tube. 


Room temperature for ≤24 hours, Refrigerated for ≤7 days, Frozen for ≤1 year.

Causes for Rejection:

Incomplete and/or incorrect sample identification, improper storage/transport, gross hemolysis, icterus or lipemia.  

Reference Range:

By report (reports may vary based on instrumentation, patient age and sex)

Turnaround Time:

Routine: 8 hours; ASAP: 4 hours; STAT: 1 hour.


End Point Colorimetric, oxidase  


24 hours a day; 7 days a week


Clinical Chemistry

Patient Preparation :

Do not draw specimen from an arm receiving intravenous transfusion.

CPT 4 Code:



Indicate on slip and announce to lab personnel if sample is a CODE; sample will receive priority analysis.

When ordering tests for which Medicare or Medicaid reimbursement will be sought, physicians should only order tests that are medically necessary for the diagnosis or treatment of the patient. Components of the organ or disease panels may be ordered individually. The diagnostic information must substantiate all tests ordered and must be in the form of an ICD-10 code or its verbal equivalent.
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