Clinical Use: Differential diagnosis of spontaneous hypoglycaemia
Background: The measurement of both insulin and C-peptide is advisable in these investigations since in some cases of insulinoma, insulin levels may be low or marginally inappropriate whereas C-peptide is almost always raised.

Further tests, such as those for ketones, proinsulin, sulphonylureas, growth hormone and the insulin-like growth factors may also be required to complete the diagnostic process

Reference Ranges: Adult (Fasting): 0.11 – 0.61 nmol/LAn interpretation of the result(s) will be provided where sufficient information accompanies the request.
Associated Diseases:
Patient Preparation: Hypoglycaemia, spontaneous or whilst fasting, must first be established, by regular monitoring of blood glucose levels.Blood collected in a plain vacutainer or syringe, when the blood glucose concentration (confirmed by laboratory analysis) is less than 2.2 mmol/L (or less than 2.5 mmol/L in patients over 60 years), should be used for the tests.
Specimen Requirements: A Serum sample is required for this assay
Turnaround Time: 1 week
Additional Information:
Referred Test: Referred test