Diagnostics First · London · Kensington

Blood
Diagnostics
London

Biomarker-Led  ·  Clinically Essential  ·  Physician-Reviewed

At The Catalyst Clinic, comprehensive bloodwork is not optional — it is the foundation of every programme. Without your data, no protocol is discussed. Bloodwork establishes your baseline, uncovers hidden imbalances, and ensures every clinical decision is safe, appropriate, and traceable to your biology.

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Why Diagnostics Matter

100%

of patients require bloodwork before any protocol

60+

biomarkers assessed per panel

4–5

months between repeat diagnostics

0

protocols designed without data

Every result is reviewed personally by Dr. Ethan Hausman-Marquis. – not delegated. Not algorithmic. Personal.

The Catalyst Clinic provides medical advisory consultations only. Diagnostic testing is conducted to inform clinical discussions and does not constitute a diagnosis. All protocols are advisory in nature and supervised by a GMC-registered physician.
Mandatory Pre-Consultation 60+ Biomarkers Assessed Personally Reviewed by Dr. Ethan Repeat Every 4-5 Months Full Clinical Documentation

The Foundation

Why Bloodwork is Non-Negotiable

Most clinics skip diagnostics. We consider this the single greatest clinical risk in peptide advisory medicine. Your bloodwork is not a box-ticking exercise — it is the entire basis on which a safe, appropriate, and effective programme can be designed.

Reason 01

Establishes Your Baseline

Before any programme can be designed, Dr. Ethan needs to know exactly where your biology is starting from. Hormone levels, inflammatory markers, organ function, metabolic health — all established before anything else is discussed.

  • Hormone profile baseline
  • Inflammatory marker baseline
  • Metabolic function baseline
  • Organ health confirmation

Reason 02

Uncovers Hidden Imbalances

Many patients present with imbalances they are completely unaware of — subclinical thyroid dysfunction, testosterone deficiency, elevated inflammatory markers, insulin resistance. These must be identified before any protocol is designed.

  • Subclinical thyroid dysfunction
  • Hormonal deficiencies
  • Inflammatory burden
  • Metabolic imbalances

Reason 03

Ensures Clinical Safety

Certain compounds are contraindicated in specific clinical contexts. Without bloodwork, contraindications cannot be screened for. This is not optional — it is the most fundamental patient safety requirement in this field.

  • Contraindication screening
  • Drug interaction assessment
  • Organ function verification
  • Cancer marker screening where relevant

Reason 04

Guides Compound Selection

Your diagnostic results determine which compounds are relevant to your profile, which are unnecessary, and which should be avoided entirely. No two protocols are identical because no two patients have identical bloodwork.

  • Data-driven compound matching
  • Eliminates unnecessary compounds
  • Identifies highest-priority areas
  • Prevents protocol waste

Reason 05

Enables Progress Tracking

Without a baseline, progress cannot be measured. Repeat bloodwork every four to five months allows Dr. Ethan to assess what is changing, what is improving, and what adjustments need to be made — all based on data, not guesswork.

  • Objective progress measurement
  • Protocol refinement based on data
  • Long-term health trend tracking
  • Documented clinical history

Reason 06

Maintains Clinical Appropriateness

Biology changes. A protocol that is appropriate today may not be appropriate in six months. Regular diagnostics ensure that clinical oversight is ongoing — not just a one-time assessment at the start of a programme.

  • Ongoing clinical appropriateness
  • Adaptation to biological changes
  • Prevents protocol staleness
  • Continuous physician oversight

The Panels

What We Test

Our diagnostic panels are selected by Dr. Ethan based on nearly 20 years of specialist experience in peptide science and regenerative physiology. Every marker included has a specific clinical rationale.

Core Panel

Complete Blood Count & Metabolic

  • Full Blood Count (FBC) — red cells, white cells, platelets, haemoglobin
  • Comprehensive Metabolic Panel — kidney function, liver enzymes, electrolytes
  • HbA1c — long-term blood glucose regulation
  • Fasting glucose and insulin — metabolic health
  • Lipid panel — total cholesterol, LDL, HDL, triglycerides
  • eGFR — kidney filtration rate
  • ALT, AST, GGT — liver function markers

Hormonal Panel

Endocrine & Reproductive Hormones

  • Total and free testosterone
  • Oestradiol (E2)
  • Progesterone
  • SHBG — sex hormone binding globulin
  • LH and FSH — pituitary gonadotrophins
  • Prolactin

Growth Hormone Axis

GH & IGF-1 Markers

  • IGF-1 (Insulin-like Growth Factor 1) — GH axis proxy
  • IGFBP-3 — IGF binding protein
  • Growth hormone (fasting) where indicated
  • Cortisol — HPA axis assessment
  • ACTH — adrenocorticotropic hormone

Thyroid Panel

Full Thyroid Function

  • TSH — thyroid stimulating hormone
  • Free T3 (FT3) — active thyroid hormone
  • Free T4 (FT4) — thyroid prohormone
  • Reverse T3 (rT3) where indicated
  • Anti-TPO antibodies — autoimmune thyroid screening
  • Anti-thyroglobulin antibodies

Inflammatory Markers

Systemic Inflammation Assessment

  • High-sensitivity CRP (hsCRP)
  • Fibrinogen where indicated
  • IL-6 (Interleukin-6) where indicated
  • Ferritin — iron stores and inflammation marker

Additional Markers

Longevity & Nutritional Panel

  • Vitamin D (25-OH) — immune and hormonal function
  • Vitamin B12 and folate
  • Iron studies — serum iron, transferrin, saturation
  • Zinc and magnesium
  • PSA (males over 40) — prostate health
  • Tumour markers where clinically indicated

The Difference

Most Clinics Don't Do This

The majority of peptide clinics in London do not require comprehensive pre-consultation bloodwork. At The Catalyst Clinic, it is non-negotiable for every patient, every time.

01

Not Optional

Bloodwork is a mandatory prerequisite — not an add-on. No patient proceeds to a protocol discussion without complete diagnostics reviewed by Dr. Ethan.

02

Personally Reviewed

Every result is reviewed by Dr. Ethan. Not a nurse, not an algorithm. The physician who designed your programme.

03

Repeated Regularly

Diagnostics are not a one-time event. Bloodwork is repeated every four to five months throughout your programme to ensure continued clinical appropriateness.

04

Fully Documented

Every result, every decision, every protocol adjustment is documented and traceable. You always know what is in your programme and why it is there.

05

Globally Available

Remote patients can access diagnostics through local phlebotomy services. The clinical standard remains identical regardless of your location — UK, Europe, UAE, USA, or Australia.

06

PhD-Level Interpretation

Reading bloodwork is a skill. Interpreting it in the context of peptide science requires nearly 20 years of specialist research experience. That is what every patient at The Catalyst Clinic receives.

The Clinical Standard

Data Before Everything.

The Catalyst Clinic operates within a fully regulated private medical framework. All clinical programmes are physician-led, diagnostics-based, and subject to ongoing medical oversight by a GMC-registered physician.

We are the only peptide advisory clinic in London where the physician reviewing your bloodwork has a PhD in Cell and Genomic Biology and has published two works in peptide science. The depth of interpretation you receive is not available elsewhere in London.

If a clinic does not require bloodwork before offering a peptide programme — that is the most important question to ask them. It is also the most important reason to choose us.

"Without your data, I cannot design a safe programme. Bloodwork is not a formality — it is the entire clinical foundation. Every compound I discuss is selected because your results indicate it is relevant to your specific biology."

Dr. Ethan Hausman-Marquis

  • PhD, Cell & Genomic Biology — Karolinska Institute, Stockholm
  • US & European Board-Certified, Regenerative Medicine
  • Member, American Academy of Anti-Aging Medicine (A4M)
  • Author — Peptide-Based Cancer Therapies
  • Author — Exploring the World of Peptides
  • Renowned Podcast Host — The Science of Age-less Living
  • Nearly 20 years specialist bench top peptide research experience

Common Questions

Frequently Asked

Bloodwork establishes your baseline hormone levels, inflammatory markers, metabolic function, and organ health. Without this data it is not possible to design a safe, clinically appropriate, or individualised programme. It also screens for contraindications that would make certain compounds unsuitable. This standard applies to every patient at The Catalyst Clinic regardless of age, health history, or stated goals.
Our standard panel includes a full blood count, comprehensive metabolic panel, full hormonal profile (testosterone, oestradiol, SHBG, LH, FSH), thyroid function (TSH, FT3, FT4), growth hormone axis markers (IGF-1, IGFBP-3), inflammatory markers (hsCRP, ESR, homocysteine), and nutritional markers (Vitamin D, B12, iron studies). Additional markers are added based on your individual goals and health history.
Diagnostics are repeated every four to five months throughout your programme. This allows Dr. Ethan to track progress against your baseline, assess what is changing, and make data-driven protocol adjustments. Biology changes over time — ongoing monitoring ensures your programme evolves with it.
Yes — if you have recent comprehensive bloodwork (within the last 8-12 weeks) that covers the relevant markers, Dr. Ethan can review these as part of your consultation. However, if key markers are missing or results are outdated, additional testing will be required before a programme can be discussed.
If diagnostics reveal a clinical concern — an undiagnosed condition, a significant deficiency, or a contraindication — Dr. Ethan will discuss this with you directly. In some cases, addressing the underlying issue takes priority before a peptide advisory programme is appropriate. Patient safety is always the first clinical consideration.
Yes. Remote patients across the UK, Europe, UAE, Australia, Canada, and the United States can access diagnostics through local phlebotomy services or home testing kits. Dr. Ethan will advise on the most appropriate option for your location. The clinical standard remains identical regardless of where you are based.
Not all do. Many clinics offer peptide programmes without requiring comprehensive pre-consultation diagnostics. At The Catalyst Clinic, we consider mandatory bloodwork to be the most fundamental patient safety requirement in this field. If a clinic does not require it, we strongly recommend asking why before proceeding with any programme.

Begin Your Programme

Every programme
begins with
your data.

Book a discovery consultation and begin with a comprehensive diagnostic panel — personally reviewed by Dr. Ethan Hausman-Marquis before any protocol is discussed.

Every Programme Includes

  • Mandatory pre-consultation bloodwork
  • 60+ biomarkers assessed
  • Personal review by Dr. Ethan
  • Full hormonal, metabolic & inflammatory panel
  • Repeat diagnostics every 4-5 months
  • Full clinical documentation
  • Ongoing physician oversight

96 Kensington High Street, London W8 4SG
Remote consultations available worldwide

Clinical Notice

The Catalyst Clinic provides medical advisory consultations only. Diagnostic testing is conducted to inform clinical discussions and does not constitute a formal diagnosis. Results are reviewed by a GMC-registered physician within a regulated private medical framework. Nothing on this page constitutes medical advice or a treatment recommendation. For our full regulatory and compliance statement visit thecatalystclinic.com/compliance-uk.