Check the evidence before you choose a test

What is now available

From 15 October 2026, anyone can read 74 guides at /guides before choosing a test or a treatment [1]. They answer the questions people bring to a private doctor in London, from whether a full body MRI is worth having to which form of magnesium the evidence supports.

Together they cite 573 sources, 143 of them research papers listed with their DOI and their PubMed identifier, so a reader can open the study a sentence rests on [1].

What the guides cover

The guides fall into a few families, each one linked from the guides page [1].

• Tests and scans, such as ApoB, Lp(a), the PSA test, DEXA and full body MRI
• Screening and its limits, including overdiagnosis and incidental findings
• Supplements, from vitamin D and omega 3 to creatine and probiotics
• Choosing care, such as a private GP, membership or insurance
• Care from abroad, with records, interpreters and follow-up once home
• How we work, including what our fees include and what we do not offer

How the guides are written

Each guide opens with a short answer to its question, then gives the detail. A claim about health ends in a numbered citation to its source, and every figure the guide prints is held in a ledger with the page it came from and the day it was read [2].

The guides are written in plain English for a reader who is not a doctor, and they explain the terms a doctor would use, so a patient can follow a letter or a result after reading one. Some guides say that more testing is not always better care, and one sets out what we do not offer and why [3] [4]. The aim is a decision the reader can make with their doctor, with the evidence in front of them.

A few of the guides

These are among the questions people ask us most, each with a guide of its own [1].

• Full body MRI in London, what it costs and whether it is worth it, at /guides/full-body-mri-london
• ApoB and cholesterol testing, and what the results tell you, at /guides/apob-and-cholesterol-testing
• When more testing is not better care, at /guides/when-more-testing-is-not-better-care
• What a private doctor costs in London, and what our fees include, at /guides/what-our-fees-include
• A second opinion from London when you live abroad, at /guides/second-opinion-from-overseas
• Vitamin D, when to test and how much to take, at /guides/vitamin-d-testing-and-supplements

Review and dates

Every guide shows the day it was last reviewed. A guide with clinical content carries a review status, and it records a clinician's sign-off once a doctor has read it in full [1].

When the evidence moves, the guide is read again and its date changes. A reader can always see how recent the page in front of them is, and which sources it rests on, before deciding how much weight to give it. A guide that no longer reflects the evidence is corrected rather than left in place.

What it costs

The guides are open to everyone to read. Where a guide describes care we offer, it gives our fee from the same list the request page charges, such as a GP appointment at £150, a telephone consultation at £59 or a Core Wellness blood panel at £350 [5].

How to begin

Open /guides and choose the question closest to yours. Each guide ends with the next step, usually a request for the test or the appointment it describes, with the fee shown before you confirm.

A guide does not replace a conversation with a doctor who knows your history. It is written so that the conversation can start from the evidence, with your questions already sharpened, and so you know what a test or a scan can and cannot tell you before you ask for one.

If you are unsure where to start, a GP appointment is the simplest way in. The doctor can go through a guide with you and decide what, if anything, is worth doing [5].