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Laboratory Test Directory

Glucose Tolerance (3 Hour)

Components

Name Method Department Units
Glucose Fasting, 3Hr Tolerance Enzymatic, reflectometry
Core Lab, Chemistry, Routine

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

Green tube (Lithium heparin), No Gel

Micro sample tube 1 mL
Alternate

Green tube (Lithium heparin), with Gel

Micro sample tube 0.3 mL
Alternate

Red tube, (no anticoagulant), No Gel

3 mL 3 mL
Alternate

Gold tube, (SST) with Gel

3.5 mL 3.5 mL
Stability

Refrigerated - 24 hour(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

Can be performed on Inpatients 7 days a week-notification to the Lab helpful but not required. Outpatient Laboratory collection and testing MUST be performed M-F and MUST be scheduled with Central Scheduling. "Close To Home" (offsite) collection can be scheduled by calling the site directly. Analysis of testing collected in Sodium Fluoride is limited to glucose and lactate only. No other routine analytes are possible. If a glucose tolerance is ordered without a length of time for the tolerance a glucose tolerance will be ordered with just a fasting and 2 hour tolerance collected. 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. GLUCOLA dose is determined by patient's weight.

CPT Code

  • 82952 (x2)
  • 82951