When we talk about skin health, it’s not enough to look at the surface. Hidden imbalances in the gut and metabolism often drive persistent skin issues. That’s why I’m excited to discuss a brand new Gut Health Test; a blood spot test that can help you and your clients gain deeper insight into gut-metabolic function without the mess of stool samples.
In this post, we’ll explore what the test measures, how it works, what the results tell us, and how to use that info in skin health protocols.
What is the blood spot Gut Test?
The test is a dried blood spot test that can be done easily at home. You simply prick your finger, place a few drops of blood on the provided filter paper, and send it to the laboratory for analysis.
Rather than identifying which bacteria are present in your gut, this test measures how your gut is functioning specifically, how efficiently your gut bacteria convert nutrients and how balanced your immune and inflammatory pathways are.
It focuses on a key metabolic pathway involving the amino acid tryptophan and three important metabolites:
Indole-3-propionic acid (IPA): a protective compound made by gut bacteria that supports the gut barrier and reduces oxidative stress.
Tryptophan (TRP): an essential amino acid obtained from your diet that supports mood, immunity and skin health.
Kynurenine (KYN): a metabolite that increases when there is inflammation or immune activation.
The test calculates ratios between these markers (IPA:TRP, KYN:TRP, and IPA:KYN) to give insights into:
- The efficiency of your gut microbiome
- Levels of immune or inflammatory stress
- The overall balance between beneficial and stress related pathways
These are combined to create a Gut Health Index, a snapshot of how well your gut and immune system are working in harmony.
Why This Matters for Skin Health
A healthy gut supports glowing skin in many ways. Here is what the Gut Health Test can reveal:
1. Functional insights rather than presence
Traditional stool tests show which microbes are there. This test shows what they are doing whether they are creating protective or inflammatory metabolites.
2. Understanding immune activation
A raised KYN:TRP ratio may indicate inflammation or immune stress, which can worsen acne, eczema, or rosacea.
3. Identifying barrier weakness
Low IPA suggests reduced antioxidant protection and gut barrier integrity, both of which are linked to increased skin sensitivity and redness.
4. Personalised treatment guidance
The test enables targeted nutrition, supplements, and lifestyle plans tailored to your unique microbiome profile.
How the Test Works
- Order your Gut Health Test kit.
- Use the sterile lancet to prick your finger.
- Place blood drops on the filter card and allow to dry for ten minutes.
- Register your test online and post it to the laboratory.
- Receive your results securely within 10–20 days.
Understanding the Results
Your report includes:
- Levels of IPA, TRP, and KYN
- Ratios between these markers
- A Gut Health Index
- Personalised lifestyle and nutrition recommendations
In clinic, I interpret your results alongside your symptoms, history, and other test data. Together, we create a bespoke plan that may include:
- Dietary changes and improved fibre diversity
- Specific prebiotics or probiotics
- Gut barrier support (for example L-glutamine, zinc, or deglycyrrhizinated liquorice)
- Anti-inflammatory nutrients and stress management techniques
- Retesting to track improvement over time
Things to Keep in Mind
- This test offers functional insights rather than medical diagnosis.
- Results can vary with diet, sleep, stress, and lifestyle, so consistency matters.
- It does not identify individual bacterial strains but shows how well your microbiome is performing.
In Summary
The blood spot Gut Health Test is a convenient, evidence-based way to understand how your gut influences your skin. By identifying early imbalances, we can design a personalised plan to restore harmony, reduce inflammation, and bring out your skin’s natural radiance from within.
Ready to Understand Your Gut–Skin Connection?
Book your Functional Dermatology Consultation today to explore your gut test options, review your results in depth, and receive a tailored plan for clearer, healthier skin.
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