A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # |
Glucose Tolerance Test, Plasma or Serum
MessageJelly Beans are not an acceptable alternative to the glucose solution
Test Code
7423
CPT Codes
82951-3 Specimens; 82952-Each additional specimen
Preferred Specimen
Submit only 1 of the following specimens:
Plasma
Container/Tube: Green-top (heparin) tube(s)
Specimen Volume: 3 mL (minimum volume: 0.5 mL) of plasma
Collection Instructions: Fasting (8-12 hour).
1. Draw fasting specimen before administration of glucose.
2. Administer 75 g glucose solution orally to nonpregnant adults. Pregnant females should receive 100 g glucose for a 3 hr tolerance or 75 g for a 2 hr tolerance. Call CoxHealth Laboratories at 417-269-7820 for dosages for children.
3. For nonpregnant adults, draw second specimen at 2 hours after dosing or as specified by the ordering physician.
4. For pregnant females, draw specimens at 1 hour, 2 hours, and hourly thereafter up to the time specified after administration of dose.
Note: 1. Indicate corresponding draw time and plasma. 2. Label specimens appropriately (corresponding draw time and as plasma).
Serum
Container/Tube: Serum gel tube(s)
Specimen Volume: 3 mL (minimum volume: 0.5 mL) of serum
Collection Instructions: Fasting (8-12 hour).
1. Draw fasting specimen before administration of glucose.
2. Administer 75 g glucose solution orally to nonpregnant adults. Pregnant females should receive 100 g glucose for a 3 hr tolerance or 75 g for a 2 hr tolerance. Call CoxHealth Laboratories at 417-269-7820 for dosages for children.
3. For nonpregnant adults, draw second specimen at 2 hours after dosing or as specified by the ordering physician.
4. For pregnant females, draw specimens at 1 hour, 2 hours, and hourly thereafter up to the time specified after administration of dose.
Note: 1. Indicate corresponding draw time and serum. 2. Label specimens appropriately (corresponding draw time and as serum). "
Plasma
Container/Tube: Green-top (heparin) tube(s)
Specimen Volume: 3 mL (minimum volume: 0.5 mL) of plasma
Collection Instructions: Fasting (8-12 hour).
1. Draw fasting specimen before administration of glucose.
2. Administer 75 g glucose solution orally to nonpregnant adults. Pregnant females should receive 100 g glucose for a 3 hr tolerance or 75 g for a 2 hr tolerance. Call CoxHealth Laboratories at 417-269-7820 for dosages for children.
3. For nonpregnant adults, draw second specimen at 2 hours after dosing or as specified by the ordering physician.
4. For pregnant females, draw specimens at 1 hour, 2 hours, and hourly thereafter up to the time specified after administration of dose.
Note: 1. Indicate corresponding draw time and plasma. 2. Label specimens appropriately (corresponding draw time and as plasma).
Serum
Container/Tube: Serum gel tube(s)
Specimen Volume: 3 mL (minimum volume: 0.5 mL) of serum
Collection Instructions: Fasting (8-12 hour).
1. Draw fasting specimen before administration of glucose.
2. Administer 75 g glucose solution orally to nonpregnant adults. Pregnant females should receive 100 g glucose for a 3 hr tolerance or 75 g for a 2 hr tolerance. Call CoxHealth Laboratories at 417-269-7820 for dosages for children.
3. For nonpregnant adults, draw second specimen at 2 hours after dosing or as specified by the ordering physician.
4. For pregnant females, draw specimens at 1 hour, 2 hours, and hourly thereafter up to the time specified after administration of dose.
Note: 1. Indicate corresponding draw time and serum. 2. Label specimens appropriately (corresponding draw time and as serum). "
Instructions
The American Diabetes Association recommends specimens be drawn only as fasting and at 2 hours for nonpregnant adults. The patient should not eat after the evening meal on the day before the test, although water may be taken. The patient should remain at rest during the test and refrain from smoking, eating and caffeine-containing beverages.
Patients presenting for a 3 hour glucose tolerance test should expect the process to take 4 to 5 hours.
Patients presenting for a 3 hour glucose tolerance test should expect the process to take 4 to 5 hours.
Transport Temperature
Refrigerate
Methodology
Hexokinase
Setup Schedule
Monday through Sunday
Reference Range
Criteria for Impaired Glucose Tolerance and Diabetes Mellitus (mg/dL) |
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Time of Specimen |
Normal |
Impaired Glucose Tolerance |
Diabetes Mellitus |
Fasting |
<100 |
<126 |
≥126 |
30, 60, or 90 minutes |
<200 |
140-200 |
≥200 |
120 minutes |
<140 |
140-200 |
≥200 |
Criteria for Gestational Diabetes Mellitus |
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Time of Specimen |
Gestational Diabetes Mellitus |
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Fasting |
>95 |
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1 hour |
>180 |
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2 hours |
>155 |
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3 hours |
>140 |
Clinical Significance
Useful for establishing the presence of glucose intolerance
Performed By
CoxHealth