C-peptide (serum)

Referred to Berkshire & Surrey Pathology Services, Frimley Park Hospital NHS Foundation Trust, Portsmouth Road, Frimley, Surrey GU16 7UJ

Alternative names, keywords

Insulin C-peptide

Samples required

Clotted blood (gold cap, 5 mL tube), bring to lab immediately on ice, plus

Fluoride oxalate blood (grey cap, 2 mL tube) for paired glucose.

Smaller tubes are available for paediatric samples.

DO NOT send samples on ice via pneumatic tube (pod) system.

Test indications

?Type1/2 diabetes - assessment of beta cell function. Please request T1T2 profile when hyperglycaemic. This includes GAD antibody, plasma glucose, and C-peptide. A separate clotted sample is needed for the GAD antibody.

Investigation of hypoglycaemia.

Reference range

See report.

Turnaround time

Referral lab quotes turnaround time of 3 days, however additional time must be allowed for packing, dispatch and delivery of sample, and return and processing of results.


Biochemistry (Referrals)