A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # |
Glucose
Test Code483
CPT Codes
82947
Preferred Specimen
1 mL serum collected in a serum separator tube (SST)
Patient Preparation
Fasting preferred. Fasting is defined as no consumption of food or beverage other than water for at least 8 hours before testing.
Minimum Volume
0.5 mL
Other Acceptable Specimens
Plasma collected in a fluoride/oxalate (gray-top), or sodium or lithium heparin (green-top) tubes • Whole blood collected in a fluoride/oxalate (gray-top) tube
Instructions
Serum and plasma submissions must be separated from cells
Transport Temperature
Room temperature
Specimen Stability
Serum
Room temperature: 4 days
Refrigerated: 7 days
Frozen: 28 days
Whole blood (gray-top) tube
Room temperature: 24 hours
Refrigerated: 72 hours
Frozen: Unacceptable
Sodium fluoride plasma
Room temperature: 7 days
Refrigerated: 7 days
Frozen: 28 days
Heparinized plasma
Room temperature: 48 hours
Refrigerated: 7 days
Frozen: 28 days
Room temperature: 4 days
Refrigerated: 7 days
Frozen: 28 days
Whole blood (gray-top) tube
Room temperature: 24 hours
Refrigerated: 72 hours
Frozen: Unacceptable
Sodium fluoride plasma
Room temperature: 7 days
Refrigerated: 7 days
Frozen: 28 days
Heparinized plasma
Room temperature: 48 hours
Refrigerated: 7 days
Frozen: 28 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Unspun serum or plasma separator tube (SST or PST) • Red-top or green-top tube (serum or heparinized plasma not separated from cells) • Anticoagulants other than lithium heparin, sodium heparin or fluoride/oxalate
Methodology
Spectrophotometry (SP)
Setup Schedule
Set up: Daily; Report available: Next day
Limitations
Glucose levels may be depressed if sample is left to clot and not spun for an excessive length of time.
Reference Range
Fasting Reference Interval | 65-99 mg/dL |
Non-fasting Reference Interval | 65-139 mg/dL |
Clinical Significance
Serum glucose levels may be abnormally high (hyperglycemia) or abnormally low (hypoglycemia). Glucose measurements are used in the diagnosis and treatment of carbohydrate metabolic disorders including diabetes mellitus, idiopathic hypoglycemia, and pancreatic islet cell neoplasm.
Performing Laboratory
Quest Diagnostics Nichols Institute
14225 Newbrook Drive
Chantilly, VA 20153