Specimen

Plasma

Alternate
Collection Media:

Call laboratory for additional acceptable specimen collection 
containers.

Minimum:

2 ml; gray (sodium fluoride) top
(or 1 microtube for pediatric patients) per specimen.

Testing Schedule:

24 hrs/day, 7 days a week, including holidays.

Analytic Time:

2 hours (upon receipt in laboratory)

Reference Range:

Valid results depend on adequate patient preparation.  For patient
preparation and interpretation see DIABETES 18:299, 1969.

Comments:

Collect all specimens in gray top tube on patient care area and hold 
(sodium fluoride anticoagulant).  Deliver all specimens simultaneously. 
Microtube specimens must be scheduled with the lab in advance and 
delivered immediately after drawing.

Three hour Glucose Tolerance Test should include the following 
specimens:
  Fasting glucose
  1 hour post glucose
  2 hour post glucose
  3 hour post glucose

CPT code is 82947 x number of specimens

CPT code = 82947 x number of glucose performed

Test
Limitations:

Icterus: No significant interference up to an I index of 60 
(approximate conjugated and unconjugated bilirubin concentration: 60 
mg/dl).

Hemolysis: No significant interference up to an H index of 1000 
(approximate hemoglobin concentration 1000 mg/dl).

Lipemia (Intralipid): No significant interference up to an L index of 
1000 (approximate triglycerides concentration 2000 mg/dl). There is 
poor correlation between turbidity and triglycerides concentration.

Methodology:

Enzymatic

CPT Code:

See comments

See Additional Information:
Fasting Specimen Requirements
Specimens Requiring Immediate Delivery