Pathology Handbook

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Growth Hormone (GH) Suppression Test

Alternative Names:

GH Supp Test
OGTT with GH

Laboratory:

Clinical Biochemistry

Test Code:

EGT (for glucose samples); GH (for growth hormone samples)

Medicare rebatable:

Yes

Registration Instructions:

Contact the chemical pathologist before registration.

Glucose samples: register EGT. Five barcode labels (one request number) will be generated for baseline (fasting) and +30 minutes, +60 minutes, +90 minutes and +120 minutes post glucose load. The test is performed in-house at NPV.

Growth hormone (GH) samples: register a separate request number and actual collection time for each sample.

Specimen Types:

Serum
Plasma

Container Types:

SST
Fluoride Oxalate

Adults Volume or Mass:

2 mL

Minimum/Paediatric Volume or Mass:

2 mL

Collection & Request Instructions:

Contact the chemical pathologist before the start of collections.

1. The patient should fast from 10pm the day prior to the morning test.

2. Collect baseline glucose and GH, and IGF-1 (if IGF-1 is requested).

3. Give 75g oral glucose load.

4. Collect GH (SST tube) and Glucose (Fluoride Oxalate tube) every 30 minutes for 2 hours.

Time	Procedure/ Test
Fasting (baseline)	Glucose, GH, IGF-1
	75g oral glucose load
+30 minutes after glucose load	Glucose, GH
+60 minutes after glucose load	Glucose, GH
+90 minutes after glucose load	Glucose, GH
+120 minutes after glucose load	Glucose, GH

Enquiries: Contact Pathologist or Biochemistry Department

Transport Instructions:

Send to lab immediately

Processing Instructions:

GH: Collect SST tube at ambient temperature, centrifuge, aliquot, store frozen (for sendaway to the Alfred Pathology Service)

Glucose: Collect fluoride oxalate tube at ambient temperature, centrifuge. Analysed in-house at NPV

External Laboratory:

See Reference Laboratory details below

External Laboratory details...

External Transport Instructions:

GH: Send frozen on dry ice to the Alfred Pathology Service (APS).

USEFUL LINKS

Frozen Section Booking Form