C-Peptide

Pathology category

Biochemistry - referred tests

Code

CPEP

Referral code

Request form

Test information

Usually requested with insulin for investigation of hypoglycaemia (Glucose <2.5 mmol/L).

Also requested in differentiation of type 1 and type 2 diabetes When interpreting C-peptide as a marker of pancreatic reserve in DM it is important to take the patient’s renal function into account.

Guidelines

Pre-analytical

If hypoglycaemia check, only send if glucose <3.0 mmol/L. If required urgently contact duty biochemist.

Sample must be frozen within 12 hour of sampling

Send sample to lab immediately if insulin also required.

Reference range

see report

Tube type

Tube type info

SST/ Li Hep/ Plain

Special requirements

Serum or plasma

Minimum volume

250uL

Assay frequency

TAT Inpatient (urgent)

TAT Inpatient

4 weeks (contact lab if urgent)

TAT GP/Outpatient

4 weeks

Referral lab

Dept of Clinical Biochemistry, Royal Surrey County Hospital