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Laboratory Test Directory

Fasting Glucose

Components

Name Method Department Units
Fasting Glucose Battery Enzymatic, reflectometry
Core Lab, Chemistry, Routine mg/dL

Battery Members

Glucose, Fasting Time

Specimen Requirements

Plasma Spun, Serum Spun

Container Type Container Size Specimen Volume
Preferred

Green tube (Lithium heparin), No Gel

3 mL 3 mL
Alternate

Green tube (Lithium heparin), with Gel

3 mL 3 mL
Alternate

Red tube, (no anticoagulant), No Gel

3 mL 3 mL
Alternate

Gold tube, (SST) with Gel

3.5 mL 3.5 mL
Alternate

Green tube (Lithium heparin), with Gel

Micro sample tube 0.3 mL
Alternate

Green tube (Lithium heparin), No Gel

Micro sample tube 1 mL
Alternate

Gray tube (Sodium Fluoride/ Disodium EDTA)

Micro sample tube 1 mL
Stability

Frozen - 12 month(s)
Refrigerated - 7 day(s)
Room temperature - 24 hour(s)

Specimen Preparation

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

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

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. Patient should fast at least 8 hours with no caloric intake.

CPT Code

  • 82947