Glucose Tolerance Test (GTT), 3 Hour, Plasma or Serum
Test Code: GTT3
Collection Procedure
An appointment must be scheduled prior to testing. Call the WB Outpatient Scheduling Department at 319-768-3590 or FM Lab at 319-376-2841 to schedule an appointment.
Submit only 1 of the following specimens:
Preferred: Plasma
1.Draw a full, 3-mL green-top (lithium heparin) tube from a fasting (12 hour) patient.
2. Have patient drink entire glucose tolerance beverage supplied. Refer to dosing instructions in the Glucose Tolerance Test Policy, Grmc-home3. Draw a full, 3-mL green-top (lithium heparin) tube at 1-, 2-, and 3-hours post glucose tolerance beverage. During time of draw, patient must not eat or drink. They may be given ice chips to moisten mouth.
4. Immediately spin down and send entire tube to laboratory. Avoid hemolysis.
Note:
1.Valid results for glucose testing depend on adequate patient preparation and correct timing of specimen draw.
2. Glucose solution will not be given to patients with fasting glucose of ≥ 126 mg/dL without notification and consent of physician.
3. Vomiting negates test.
4. Indicate plasma on request form.
5. Label specimens(plasma and fasting, 1-, 2-, and 3-hour). Two patient identifiers, date, time of collection, collector's identification.
Alternate: Serum
1.Draw a full, 3.5-mL serum gel tube from a fasting (12 hour) patient.
2. Have patient drink entire glucose tolerance beverage supplied. Refer to dosing instructions in the Glucose Tolerance Test Policy, Grmc-home3. Draw a full, 3.5-mL serum gel tube at1 -, 2-, and 3-hours post glucose tolerance beverage. During time of draw, patient must not eat or drink. They may be given ice
chips to moistenmouth.
4. Allow blood to clot, immediately spin down, and send entire tube to laboratory. Avoid hemolysis.
Note:
1. Valid results for glucose testing depend on adequate patient preparation and correct timing of specimen draw.
2. Glucose solution will not be given to patients with fasting glucose of ≥ 126 mg/dL without notification and consent of physician.
3. Vomiting negates test.
4. Indicate serum on request form.
5. Label specimensappropriately (serum and fasting, 1-, 2-, and 3-hour).
Submit only 1 of the following specimens:
Preferred: Plasma
1.Draw a full, 3-mL green-top (lithium heparin) tube from a fasting (12 hour) patient.
2. Have patient drink entire glucose tolerance beverage supplied. Refer to dosing instructions in the Glucose Tolerance Test Policy, Grmc-home
4. Immediately spin down and send entire tube to laboratory. Avoid hemolysis.
Note:
1.Valid results for glucose testing depend on adequate patient preparation and correct timing of specimen draw.
2. Glucose solution will not be given to patients with fasting glucose of ≥ 126 mg/dL without notification and consent of physician.
3. Vomiting negates test.
4. Indicate plasma on request form.
5. Label specimens(plasma and fasting, 1-, 2-, and 3-hour). Two patient identifiers, date, time of collection, collector's identification.
Alternate: Serum
1.Draw a full, 3.5-mL serum gel tube from a fasting (12 hour) patient.
2. Have patient drink entire glucose tolerance beverage supplied. Refer to dosing instructions in the Glucose Tolerance Test Policy, Grmc-home
chips to moistenmouth.
4. Allow blood to clot, immediately spin down, and send entire tube to laboratory. Avoid hemolysis.
Note:
1. Valid results for glucose testing depend on adequate patient preparation and correct timing of specimen draw.
2. Glucose solution will not be given to patients with fasting glucose of ≥ 126 mg/dL without notification and consent of physician.
3. Vomiting negates test.
4. Indicate serum on request form.
5. Label specimensappropriately (serum and fasting, 1-, 2-, and 3-hour).
Schedule
Monday through Friday
Place of Service
West Burlington Laboratory; Fort Madison Laboratory
Department
Chemistry
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