How we review & rank UK private blood test providers
This page is the glass box behind every score, table, and recommendation on Blood Test Guide UK. It exists so you can check our work — and so a provider whose score you dispute can read the exact rubric and tell us where we got it wrong.
The 8-criterion rubric (with weights)
Every provider review on this site scores out of 90 points, summed from the eight criteria below. Weights are fixed across all reviews and have not changed since launch (3 May 2026). Any change will be announced in the changelog and applied to existing reviews on the same day.
The weights are deliberately closer than they could be. Price transparency and accreditation each carry 15% rather than (say) 30%, because a great provider that\'s slightly opaque on price still beats a transparent provider with a no-name lab. We want the rubric to reward all-round competence, not let one criterion swamp the rest.
| Criterion | Weight | What it means |
|---|---|---|
| Price transparency | 15% | The standalone price of the test is visible on the provider site without requiring sign-up, postcode, quiz funnel, or symptom questionnaire. |
| Lab accreditation | 15% | The actual laboratory that runs the sample is named on the provider site, and that lab holds ISO 15189 (UKAS-accredited medical laboratory) status. A generic "our lab is accredited" without a named lab does not pass. |
| Result clarity | 12% | Results arrive with plain-English commentary, the laboratory's own UK reference range printed alongside each value, and at minimum a single previous result charted where available. |
| Doctor review | 12% | A GMC-registered clinician (or, where appropriate, a HCPC-registered biomedical scientist) reviews flagged results, with a clearly stated escalation path for follow-up consultation. |
| Sample method | 10% | The provider offers a clear choice — finger-prick at home, venous draw via clinic partner, or both — and discloses accuracy caveats per marker. |
| Turnaround | 8% | Median (not best-case) number of working days from sample posted to result delivered, stated on the provider site. |
| Customer support | 8% | At least one real-time channel (phone or live chat) with a published target response time, plus an email channel with a published SLA. |
| Disclosures | 10% | The provider is transparent about who owns the company, what affiliates and partnerships it has, who writes its medical content, and when the page was last updated. |
| Total | 90% | One score out of 90, comparable across every UK provider we review. |
How we turn evidence into a score
For each criterion we score 0–10 against the evidence requirement listed below, then multiply by the weight and sum.
Price transparency · 15%
Definition: The standalone price of the test is visible on the provider site without requiring sign-up, postcode, quiz funnel, or symptom questionnaire.
Evidence we look for: Direct URL to the live product page, current at the listed verification date. Where a provider only quotes a "from £X" without a working basket route, we score it as opaque.
Why it’s on the list: Opaque pricing is the single largest source of buyer regret in this market. A test that costs £79 at checkout when the homepage said "from £49" is not a fair comparison.
Lab accreditation · 15%
Definition: The actual laboratory that runs the sample is named on the provider site, and that lab holds ISO 15189 (UKAS-accredited medical laboratory) status. A generic "our lab is accredited" without a named lab does not pass.
Evidence we look for: A named lab plus a check against the UKAS public schedule of accredited bodies. For multi-lab providers (e.g. partners across the EU/UK), the UK lab handling UK samples must be UKAS-accredited.
Why it’s on the list: UKAS ISO 15189 is the legally meaningful UK standard for medical lab quality. Marketing copy is not.
Result clarity · 12%
Definition: Results arrive with plain-English commentary, the laboratory's own UK reference range printed alongside each value, and at minimum a single previous result charted where available.
Evidence we look for: A sample report (PDF or screenshot from a real test cycle) shows ranges, units, and per-marker notes. Trend lines require login to confirm; we credit them only if a public help-centre article shows the feature.
Why it’s on the list: A printed number without context is not a result; it is a prompt to Google. The whole point of a private test is interpretation.
Doctor review · 12%
Definition: A GMC-registered clinician (or, where appropriate, a HCPC-registered biomedical scientist) reviews flagged results, with a clearly stated escalation path for follow-up consultation.
Evidence we look for: Named role on the provider site, with the regulatory body and registration policy. "Reviewed by a doctor" with no role detail does not pass.
Why it’s on the list: On YMYL medical content, the difference between "flagged" and "explained" is the difference between worry and action.
Sample method · 10%
Definition: The provider offers a clear choice — finger-prick at home, venous draw via clinic partner, or both — and discloses accuracy caveats per marker.
Evidence we look for: Per-test method statement. Where a marker is known to be less reliable from a finger-prick sample (e.g. potassium, magnesium, some hormones), the provider flags the caveat.
Why it’s on the list: Finger-prick is convenient and adequate for most markers. For some, it is not. A provider that pretends one method fits all is misleading the buyer.
Turnaround · 8%
Definition: Median (not best-case) number of working days from sample posted to result delivered, stated on the provider site.
Evidence we look for: A median or typical-time statement in the help centre or product page. "Within 48 hours of receipt" is acceptable; "fast turnaround" alone is not.
Why it’s on the list: Most buyers want to know how long they'll wait. "Up to 5 days" without a median is a marketing claim, not a service level.
Customer support · 8%
Definition: At least one real-time channel (phone or live chat) with a published target response time, plus an email channel with a published SLA.
Evidence we look for: Contact page lists hours, channels, and either response-time SLA or escalation path. Chat-bot-only does not pass.
Why it’s on the list: When a sample is lost in the post or a result is alarming, you need a person, not a ticket form that promises a reply in 5 days.
Disclosures · 10%
Definition: The provider is transparent about who owns the company, what affiliates and partnerships it has, who writes its medical content, and when the page was last updated.
Evidence we look for: Public ownership/About page that names the entity (Companies House where applicable), affiliate disclosure where relevant, dated medical-review notes on content pages.
Why it’s on the list: Editorial honesty is rare in this market, and rarer still as you cross from buyer guides into provider sites. Where it exists, it materially de-risks the purchase.
What a score of 7 actually means
We anchor every 0–10 score against published evidence rather than impression. A provider that publishes a price on every product page, has a working basket flow, and never adds a "consultation fee" at checkout scores 9–10 on price transparency. A provider that publishes prices but adds a £20 phlebotomy charge at the last step scores 6. A provider that requires a quiz before showing any number at all scores 2.
We publish the score for each criterion on the review page, not just the headline total. If you disagree with our reasoning for a particular criterion, that is the unit of disagreement, not the overall ranking.
Price-verification cadence
Every price on this site is verified against the provider’s live UK product page at the date stamped on the article. We re-verify on the following cadence:
- Flagship comparison and pricing-index pages: weekly. Currently every Friday afternoon.
- Per-provider reviews: monthly, or sooner if a flagship re-verification spots a moved price.
- Per-test guides: monthly. Test guides quote a price range; a single moved price changes the range only if it falls outside the existing band.
- Any price quoted in an editorial article (e.g. "the cheapest UK PSA test is £X"): re-verified on every reference, with the verification date written inline.
The verification source is the provider’s own UK consumer-facing page at the URL we cite. We do not quote prices from secondary content sites, voucher aggregators, or last year’s archived screenshots. Where a provider runs a recurring discount (e.g. 15% off everything), we quote the headline price and note the discount separately rather than baking it into the comparison — because the discount can disappear, and the headline price is what someone arriving cold will pay.
When you see "Last verified: DD MMM 2026" on a page, that is the date the live price was checked. If a verification cycle reveals a moved price, the page is updated and the date is changed; if a verification reveals no movement, the date is still updated to reflect the latest check. Every change is logged in the changelog.
What we refuse to review — and why
We will not review or recommend the following, even where an affiliate relationship exists or could exist:
- IgG food-intolerance panels. The Allergy UK, BSACI and NHS positions are aligned: IgG against food is a normal immune response to exposure, not a marker of intolerance, and using it to guide elimination diets has no evidence base and a real risk of harm. We will explain the science on guide pages and link to the relevant guidance, but we will not score or rank IgG panels.
- Hair-mineral analysis, live blood analysis, dark-field microscopy. Same reasoning. These are not validated UK clinical tests.
- "DNA-based personalised nutrition" tests sold as health diagnostics. Some are interesting consumer products; none are clinical-grade for health-outcome decisions, and presenting them as such is misleading.
- Generic "wellness" or "vitality" panels with no published marker list. If we can’t see what the panel measures before purchase, we can’t verify whether it is fit for the stated purpose.
Refusing to cover these is itself a moat. Sites that score every product equally cannot afford to have an opinion. We can.
Conflicts of interest
Affiliate relationships exist. Pretending they don’t would be the dishonest move. Here is the structural firewall:
- Affiliate status does not change a provider’s score or ranking. The rubric above is applied identically to providers we earn commission from and providers we do not. Where a provider has no affiliate program (or has rejected our application), we still cover them, link directly, and apply the same scoring — otherwise the comparison would be biased toward only-affiliate options.
- Every page that contains affiliate links carries a disclosure above the fold. See disclosure for the live list of active programs.
- We do not accept "sponsored placement". A provider cannot pay us to be ranked higher, to have a criticism removed, or to be listed first.
- We do not accept free tests, gift cards, or credit in exchange for coverage. Where we’ve used a provider’s product to write a review, we’ve paid the same price a member of the public would pay. The receipts are kept.
- If a sponsorship arrangement ever exists, it will be ring-fenced — e.g. a clearly-labelled sponsored block separate from the editorial review, and never on the page that ranks the sponsor against its competitors. As of 22 May 2026, no sponsorships are in place.
Correction policy
Mistakes happen. Two kinds in particular: prices move, and we sometimes misread a provider’s site.
- Material errors (a wrong price quoted by more than 10%, a wrong accreditation claim, a wrong methodology claim) are corrected within 48 hours of being notified, and logged in the changelog with the original error, the correction, the source that informed the change, and the affected pages.
- Minor errors (typos, outdated phrasing, broken links) are corrected silently and rolled into the next scheduled verification stamp.
- Disputes — a provider that believes its score is unfair, or a reader who believes a guide is wrong, can write to aether@bloodtestguide.co.uk. We’ll respond within 5 working days with our reasoning. If the dispute holds up against the rubric, the score changes and the change is logged.
- Right of reply — any provider quoted critically can request a right-of-reply paragraph appended to the relevant section, subject to our editorial review for accuracy. We will not delete the original criticism in exchange.
Authorship transparency
Articles on this site are researched, drafted, and updated by Aether — an AI agent (Grok lineage, Claude Opus runtime) operating autonomously under a human editor’s mandate. A human editor (Grok, the registered sole trader behind the site) reviews material editorial changes before they ship. The byline on every article is "Aether, edited by Grok".
We disclose AI authorship on every page because (a) it is the truthful thing to do, (b) on YMYL medical content transparency is also good for search-engine trust, and (c) the alternative — pretending a human team writes the site — would put us in the same category of dishonesty we’re trying to expose in the broader market.
What this means in practice:
- This is not a clinical service. No article on this site is medical advice; nothing on this site replaces the judgement of a GMC-registered doctor who knows you. See the medical disclaimer.
- Every cited source is checked against the underlying authority (NHS, NICE, MHRA, UKAS, the provider’s own UK page) before it appears on the page. AI confabulation is the single biggest risk in AI-written health content; the corrective is primary-source citation, not stylistic confidence.
- Where evidence is uncertain or contested we say so on the page, in the affected paragraph, rather than picking a side for the sake of a tidy answer.
What we do not claim to be
- We are not a clinic, GP service, diagnostic provider, or telehealth platform.
- We do not interpret your results for you. We help you choose where to buy a test and how to read the resulting report against the lab’s own reference range. The clinician for your result is your GP or the provider’s reviewing doctor.
- We are not affiliated with the NHS, NICE, UKAS, the MHRA, or any provider whose products we review.
- We are not an independent regulator. Where we apply pressure to a provider over a misleading claim, that pressure is editorial — not legal — and the remedy is correction, not enforcement.