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Test & Collection Guide

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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
Fluoride/oxalate tube (grey)
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.

 

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

  

 

If EMR is not available, Pathology results are available from Auscare.  If you do not have an Auscare login,please complete attached form. https://pathology.easternhealth.org.au/handbook/downloads/Auscare%20access.pdf

Instruction on how to use Auscare - https://pathology.easternhealth.org.au/handbook/downloads/Auscare%20instructions.pdf

SPECIMEN COLLECTION MODULE (SCM) FAQs - CLICK HERE

CLICK HERE for a consent form to perform tests not covered by Medicare

TURN AROUND TIMES - When will my result be available?

CLICK HERE for Minimum Labelling Requirements

CLICK HERE for a printable Pathology request form

CLICK HERE for a Log sheet for recording Pathology results

"THE ART OF CCCCOLLECTION"

PLEASE CLICK HERE FOR THE PREFERRED ORDER OF DRAW

 

Pathology Handbook

Test & Collection Guide

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