This private dynamic metabolic test measures both blood glucose and serum insulin at baseline (fasting) and at timed intervals after a standard 75g oral glucose drink. The catalogue test price is £517.50 plus a £50 phlebotomy fee, with results in 1 day.
Adding serial insulin measurements to a standard oral glucose tolerance test reveals post-meal hyperinsulinaemia, reactive hypoglycaemia patterns and early insulin resistance that a fasting glucose or HbA1c alone can miss.
Written by Mr Stephen Lingam. Reviewed by Dr Mohammad Bakhtiar (GMC 4694470) on 18/10/2026.
Fast for 10 to 12 hours overnight (plain water only) and book a morning appointment. Remain seated and resting at the clinic during the timed 2-hour sampling period.
Because blood samples are taken before the glucose drink and at timed intervals over 2 hours, allow around 2 hours and 15 minutes at 117a Harley Street.
No. A single £50 phlebotomy fee covers the timed venous blood samples collected during the tolerance test.
Laboratory glucose and insulin results from the timed series are normally returned within 1 working day.