Test Code GLU 
Methodology Spectrophotometric (SP) 
Description Useful for the evaluation of carbohydrate metabolism, acidosis and ketoacidosis, dehydration, diabetes mellitus, or hypoglycemia.

NOTE: This test, when ordered on Medicare patients, is subject to the National Coverage Determination (NCD) policy "Blood Glucose Testing". Please verify that the diagnosis code (ICD-9) you have chosen demonstrates medical necessity for the test as documented in the physician's patient record. The CMS web site or the NorDx Limited Coverage Documentation Guide are available to assist you with this verification. A properly executed Advance Beneficiary Notice (ABN) must be submitted with the specimen if medical necessity is not demonstrated by the ICD-9 code chosen. 

Specimen Draw blood in either a plain, red-top tube or serum gel tube. (HEMOLYZED SPECIMEN IS NOT ACCEPTABLE.) Spin down and separate serum from clot within 2 hours. Send 1.0 mL (minimum volume: 0.3 mL) of serum refrigerated. 
MMC Specimen Draw blood in a plasma gel tube. 1.0 mL (0.3 mL minimum) plasma required. 
Reference Values 70 - 99 mg/dL
Critical values: <= 40 mg/dL or >= 500 mg/dL
Neonatal glucose critical <= 50 mg/dL or >= 200 mg/dL. 
Analytic Time 1 Day - Available STAT 
Day(s) Test Set Up Monday through Sunday 
CPT Code(s) 82947