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Epic Test Code LAB21112 Glucose Post-dose Timed Specimen

Performing Location(s)

BMC,FOX,FTT,CRH,LFH,OCH,FXCC,HRK

Synonyms

2-hour PP Glucose, Postprandial Glucose, Screen for Diabetes Mellitus

Preferred Container

Gold or Red top tube

Specimen Type

Serum or Plasma

Alternate Container

Green or Gray top tube

Blood Tube Draw Volume

Min 50% draw volume  

Minumum Volume to Submit for Testing

0.5 mL Serum or Plasma

  • Multiple test can be performed from this volume. For question please contact the lab at 547-3975.  

Storage Requirements

Sample tubes should be centrifuged within 2 hour of collection followed by transfer of the serum (red or gold top) or plasma (green top) to a labeled plastic, aliquot tube.

See Causes of Rejection for temperature requirements.
Gray top tubes do not require centrifugation for transport up to 48 hrs.

Transportation Needs

Deliver specimen to laboratory within 1 hour of collection if unspun. If not possible see "storage Requirements". 

Causes for Rejection

Mislabeled or unlabeled specimen
Less than 50% draw for Vacutainer tubes
Patient not fasting prior to start of GTT
Stressed patient (surgery, infection, corticosteroids).
Specimen not labeled with hourly times.
>72 hours Refrigerated
> 8 hours Room Temperature
>5 days Frozen
Hemolysis > 500 mg/dL HgB
Lipemia > 700 mg/dL Trig
Bilirubin > 40 mg/dL Bili

Limitations

Glucose will decrease in samples left on the clot, and in tubes other than fluoride (gray top tube) prior to analysis. Capillary collected blood may differ from venous due to contamination from hemolysis and interstitial fluid

Reference Values

 

Reference Range

Post Glucola Dose

105-160 mg/dL

Post Prandial

95-130 mg/dL

Available STAT

Yes

Days of Analysis

All

Includes

Glucose levels drawn at a timed interval after a measured glucose load

Additional Information

Used to assess patients who have had several fasting glucose values ranging from 101 to 180 mg/dL

 

Patient Preparation for screening for Non-Gestatinal Diabetes. This test uses a 75g dose of glucola or fresh test (any other substitutes are not standerdized doses of glucose) or  following a meal (postprandial)

 

Blood is collected 1 hr post dose or  2 hr postprandial

 

 

 

Methodology

Beckman AU/Dx Series

CPT Code

82950

Last Updated

25-May-23 BHD