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Laboratory Test Directory

Glucose

Overview
Specimen Requirements
Billing Code

Components

Name Method Department Units
Glucose Enzymatic, reflectometry
Core Lab, Chemistry, Routine mg/dL
Test Code

GLUC

Typical Turnaround Time

2 hours

Setup Schedule

All shifts
Daily

Specimen Requirements

Plasma Spun, Serum Spun

Container Type Container Size Specimen Volume
Preferred

Green tube (Lithium heparin), with Gel

 3 mL 3 mL
Alternate

Green tube (Lithium heparin), No Gel

 Micro sample tube 1 mL
Alternate

Gold tube, (SST) with Gel

 3.5 mL 3.5 mL
Alternate

Red tube, (no anticoagulant), No Gel

 3 mL 3 mL
Alternate

Green tube (Lithium heparin), No Gel

 3 mL 3 mL
Alternate

Green tube (Lithium heparin), with Gel

 Micro sample tube 0.3 mL
Stability

Refrigerated - 7 day(s)

Specimen Preparation

  • Centrifuge within 1 hour, separate supernatant and refrigerate
  • Transport to laboratory as soon as possible

Whole Blood with Fluoride

Container Type Container Size Specimen Volume
Preferred

Gray tube (Sodium Fluoride)

 2 mL 2 mL
Alternate

Gray tube (Sodium Fluoride)

 Micro sample tube 1 mL
Stability

Refrigerated - 24 hour(s)
Room temperature - 24 hour(s)

Specimen Preparation

  • Mix by gentle inversion immediately after collection
  • Transport to the lab immediately after collection
  • Do not spin and separate gray top tubes

Reasons for Rejection

  • Gross hemolysis
  • Not received at proper temperature
  • Not received within specified time frame

Comments

Analysis of testing collected in Sodium Fluoride is limited to glucose and lactate only. No other routine analytes are possible. All glucose samples not separated from cells within 1 hour must be drawn in a gray top tube (if delayed transport to Laboratory is a possibility, use gray-top tube). Patient should fast for at least 8 hours without caloric intake.

CPT Code

  • 82947