Growth Hormone Suppression Test |
Ordering information: | Dynamic test requiring blood draws at 30 minute interals for 2 hours (5 samples total, for both growth hormone and glucose.
75g glucose (in 300mL solution) administered orally immediately after the first blood draw. |
Alternate names: | GTGH, GTT with Growth hormone |
Laboratory: | Biochemistry |
Test Code: | GTGH |
Specimen types: | Serum
Plasma |
Container types: | Fluoride/oxalate tube (grey)
Serum tube with gel |  |
|
Collection Instructions: | Transport specimen at Room Temperature to lab
Timepoints:
- 5 min: First collection: Glucose, GH and IGF-1
0 min: 75g glucose adminsitered (as per usual OGTT)
+ 30 min: Second collection: GH and Glucose.
+ 60 min: Third collection: GH and Glucose.
+ 90 min: Fourth collection: GH and Glucose.
+ 120 min: Fifth collection: GH and Glucose.
Keep samples with patient until end of test, then send to lab together. Growth Hormone is stable for 8 hours at room temperature.
Send samples together at end of test. |
Minimum Adult Volume: | 2 mL |
Notes: | 2mL per Serum sample, 2mL per flox sample.
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Frequency: | Twice weekly |
Result Turnaround Time: | 4-6 days |
Reference Interval: | For diagnostic purposes, negative test if GH < 1.0 at any timepoint.
For monitoring purposes, neg test if GH < 0.5 at any time point. |
Laboratory Use Only |
Accessing Results
EMR: Pathology results are available via EMR.
Auscare: If EMR is unavailable, results can be accessed through Auscare. Don’t have an Auscare login? Complete the Auscare User Form.
To access Auscare, see instructions.
Forms & Collection Guides
Consent Form – Non-Medicare Tests
For tests not covered by Medicare. Download Form
Pathology Request Form
Printable referral form for submitting pathology requests. Download Form.
Microbiology Swab Collection Guide
Step-by-step instructions for correct swab collection. Download Guide.
Preferred Order of Draw
Instructions to ensure accurate blood collection and results. View Instructions
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