| Test Name: |
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Glucose, Fasting
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| Test Code(s): |
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FSGLU / HCFSGLU
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| CPT Code(s): |
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82947
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| Methodology: |
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Hexokinase
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| Days Performed: |
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Daily, 24 hours.
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| Turnaround Time: |
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Stat: 1 hour.
Routine: 4 hours.
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Specimen Requirements
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| Specimen: |
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Blood
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| Patient Preparation: |
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Patient should have nothing to eat or drink (except water) for 8-10 hours before test.
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| Collection Container: |
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Preferred: Green cap with yellow ring (PST)
Also Acceptable:
Green top,
Red cap with yellow ring (SST),
Red top
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| Collection Volume: |
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Preferred: 1 mL
Pediatrics: 0.4 mL
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| Sample Analyzed: |
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Plasma or serum
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| Volume Required: |
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Preferred: 0.5 mL
Pediatrics: 0.2 mL
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| Specimen Processing: |
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Centrifuge. If a complete barrier has not formed, transfer cell-free plasma/serum to plastic vial. Refrigerate.
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| Specimen Transport: |
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Transport specimen to the laboratory. Transport with coolant pack if coming from outreach location.
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| Stability: |
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Ambient: 8 hours
Refrigerated: PST - 48 hours; if off cells or SST - 4 days
Frozen: okay
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Interpretation
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Reference Interval:
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| Age |
mg/dL |
| 0 days to 23 hours |
40-60 |
| 24 hours to 30 days |
50-80 |
| 31 days to 5 years |
60-99 |
| 6 years and up |
70-99 |
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| Critical Calls: |
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View
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| Additional Information: |
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A fasting glucose greater than or equal to 100 mg/dL, but less than 126 mg/dL, indicates an impaired fasting glucose level and a relatively high risk of developing diabetes.
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