Blue Horizon Medicals Diabetes & blood sugar

C Peptide

A blood test for C-peptide, a stable marker of insulin production, commonly used alongside fasting glucose to help build a picture of how the pancreas is functioning.

Doctor reviewed

Sample: Blood
Collection: Venous draw at clinic or nurse home visit
Results in: 7 days
Biomarkers: 1
Doctor reviewed: Yes

Tests for

C Peptide

Compare Health Test Score C-peptide test priced well above the diabetes-test median

£139.25

Buy now — £139.25

We may receive a commission on purchases. Prices are updated regularly but may vary.

Test specifications

Provider: Blue Horizon Medicals
Sample type: blood
Collection method: venous draw at clinic or nurse home visit
Turnaround time: 7 days
Biomarkers tested: 1
At-home test: No
Doctor reviewed: Yes
Gender focus: Both

What's tested

1 biomarker as listed by Blue Horizon Medicals.

Diabetes Health

C Peptide

About this test

C-peptide is produced by the pancreas at the same time as insulin, but it lasts longer in the blood, so measuring it gives a more stable read on how much insulin your body is making. Clinicians commonly use it, often alongside a fasting glucose result, to help build a picture of insulin production, though the result needs interpreting alongside your wider clinical picture rather than on its own.

As a single-marker test it sits around the middle of the diabetes tests we track for depth. Where it falls down is price: at £139.25 it costs more than double the median for similarly sized diabetes tests we track, the biggest factor behind its lower overall score. Collection also needs a venous draw at a clinic or a home nurse visit, with results taking around 7 days, longer than some of Blue Horizon's other tests. On the plus side, the listing is detailed, setting out a thorough description, the biomarker, turnaround, collection options and sample type clearly.

Founded in 2009, Blue Horizon Medicals uses UKAS ISO 15189 partner labs and has a Trustpilot score of 4.2 from 395 reviews. A doctor reviews the result before you receive it.

Who is it for?

This is worth considering if a clinician has recommended a C-peptide result, for example alongside a fasting glucose test, to help understand your insulin production. Given the price, it is worth checking with your GP or specialist first whether this specific marker is needed, since the cost here is well above the typical price for similarly sized diabetes tests we track. We do not have peer tests logged in this comparison group, so we cannot point to a specific cheaper alternative from another provider.

How it works

A healthcare professional takes a venous blood sample at a clinic or during a home nurse visit; there is no at-home option for this test. The lab measures your C-peptide level, and a doctor reviews the result before you receive it, typically within around 7 days.

Pros & cons

Pros

Detailed listing explaining what C-peptide measures and why.
Clear collection options, including a home nurse visit.
Doctor-reviewed result included as standard.

Cons

Priced well above the median for similarly sized diabetes tests we track.
No at-home collection option.
Turnaround of around 7 days, longer than many of the provider's other tests.
Single marker, best interpreted alongside other results such as fasting glucose.

Our editorial score

Compare Health Test Score C-peptide test priced well above the diabetes-test median

Editorial confidence: 10.0/10

C-peptide, a stable stand-in for insulin production, is what this single-marker test measures, often used alongside a fasting glucose result. At £139.25 it costs well above the median for similarly sized diabetes tests we track, its main drawback, and needs a venous draw with results in around 7 days. The listing itself is detailed and clear.

Score breakdown

Clarity and documentation 9.0/10

The listing publishes a detailed description, the full biomarker list, a stated turnaround, clear collection options, the sample type; it does not state what the report looks like.
Clinical depth 6.3/10

1 biomarkers, placing it in the 30th percentile of diabetes tests we track.
Collection convenience 8.0/10

A blood sample taken at home by a visiting nurse or phlebotomist; with a venous or clinic option as well; a home nurse visit is offered; results in around 7 days, slower than similar tests.
Results and follow-up 7.0/10

Results are reviewed by a doctor; the provider does not describe the report format.
Trust signals 7.5/10

Trustpilot 4.2 from 395 reviews; accredited lab (UKAS ISO 15189 partner labs); trading 17+ years.
Value for money 2.0/10

£139.25 against a median of £60.00 for the 18 similarly sized diabetes tests we track (+132%).

Calculated 13 September 2026 from the facts we hold about this test and provider, using our published scoring formula. Scores are not hand-edited.

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