
Written by Dr. Simon Khela MBChB MRCGP, GMC Registered Doctor
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A question I'm asked constantly, usually by patients who've seen an advert or a colleague's recommendation, is deceptively simple: what actually happens at a private health check? The honest answer is that it varies enormously between providers, and the marketing around these packages doesn't always make that clear. Some so-called “comprehensive” checks are little more than a blood test and a chat; others genuinely cover a wide range of physical measurements, blood work, and screening relevant to your age and sex.
This article sets out what a properly put-together full health check typically includes, how it compares with what the NHS already offers for free, and, just as importantly, what it can't tell you. A good health check has real value. It isn't, and shouldn't be sold as, a guarantee that nothing is wrong.
A genuinely comprehensive private health check typically includes:
What's not usually included unless you specifically pay for it as an add-on: whole-body MRI, genetic testing, and advanced tumour marker panels, all covered in more detail below.
In England, the NHS Health Check already offers a free assessment every 5 years for adults aged 40 to 74 who don't already have cardiovascular disease, diabetes, or related conditions, covering blood pressure, cholesterol, BMI and blood glucose. It's a genuinely good, evidence-based programme. It's also narrower in scope than most people assume, since it's specifically designed to catch cardiovascular risk factors, not to act as a general check of overall health.
Private health checks tend to appeal to people who fall outside that age bracket, want a broader range of tests than the cardiovascular focus of the NHS programme, prefer not to wait for their next scheduled check, or simply want the reassurance of a same-day, unhurried appointment rather than a 20-minute nurse-led review.
Here's what each part is actually looking for, and why it's included:
Blood tests: typically a full blood count (checking for anaemia or infection), kidney function (U&Es), liver function tests, a lipid profile measuring cholesterol, HbA1c or fasting glucose for diabetes risk, and thyroid function. Many packages also include vitamin D, B12, ferritin, and, for men, a PSA test, though PSA testing is something I always discuss individually given its genuine limitations around false positives.
Age and sex-specific screening: this might include a private cervical smear test for women in the relevant age range, discussion of breast or bowel screening eligibility, or a prostate discussion for men, aligned as closely as possible with what the national screening programmes already recommend rather than duplicating or replacing them unnecessarily.
Some genuinely useful-sounding tests are marketed as add-ons precisely because they're not appropriate for everyone as standard, and it's worth understanding why:
A genuinely useful health check isn't one-size-fits-all. What's actually relevant depends on:
If you're currently experiencing symptoms rather than looking for reassurance about your general health, booking a private GP appointment is the more appropriate route than a health check package, since screening tools are designed for people without symptoms, and a symptomatic problem needs to be properly worked up rather than screened for.
As a rough illustration: a fit and well 35-year-old with no family history and no symptoms is usually better served by a focused, lower-cost check than the most extensive package on offer. A 55-year-old with a family history of heart disease, a sedentary job and borderline blood pressure at their last check is a much stronger candidate for a comprehensive panel, simply because more of the additional tests are actually likely to be relevant to them.
I think it's important to be candid here, particularly given my own professional background. The Royal College of General Practitioners has publicly raised concerns about non-evidence-based private screening, warning that tests offered outside the established national screening programmes can generate results of little or no value, and sometimes cause unnecessary worry rather than genuine reassurance.
This isn't a reason to dismiss health checks altogether, but it is a reason to be realistic about what they can and can't do. The UK National Screening Committee's own principles exist precisely because testing healthy people isn't automatically beneficial: tests can produce false positives that trigger unnecessary further investigation, false negatives that offer false reassurance, and incidental findings that were never the point of the test in the first place.
A well-designed health check, built around tests with a genuine evidence base and interpreted by someone who can put your results in context, is a reasonable and useful thing. A health check that runs every test imaginable regardless of relevance, sold on the promise of “catching everything,” is not automatically better, and can occasionally do more harm than good.
There's no single evidence-based answer that applies to everyone, which is itself worth knowing, since annual health checks are often marketed as an obvious default. In broad terms:
Most comprehensive checks include a full blood count, kidney and liver function, a lipid (cholesterol) profile, blood glucose or HbA1c, and thyroid function, often with additional markers such as vitamin D, B12, ferritin, and PSA for men, depending on the package and your individual history.
It can be, though for most young adults without symptoms or risk factors, a more targeted set of tests based on your personal and family history is usually more useful than the most extensive package available.
The NHS Health Check is free for ages 40 to 74 and focuses specifically on cardiovascular risk factors. Private health checks are available at any age, are typically broader in scope, and offer faster, more flexible access.
Many include age and sex-appropriate components aligned with national screening programmes, such as a cervical smear or PSA test, but a full health check isn't the same as comprehensive cancer screening, and broad tumour marker panels aren't recommended as a standard addition for everyone.
Costs vary considerably depending on the clinic, the tests included, and whether imaging or specialist consultations are added, so it's best to ask for a clear, itemised breakdown rather than comparing headline prices alone.
There's no universal rule; every 1 to 2 years is reasonable for most adults with normal previous results and no new risk factors, while those with known risk factors may benefit from more frequent review.
No test or combination of tests can rule out every possible condition. A normal result reduces the likelihood of certain problems rather than guaranteeing good health.
Often yes, particularly if cholesterol or glucose testing is included, since eating beforehand can affect these results. Your clinic should give you specific preparation instructions when you book.
A good health check includes a proper results consultation explaining what any abnormal finding means, whether it needs further investigation, referral, or simply monitoring, rather than just handing over a list of numbers.
Not usually as standard, and often not recommended as a default addition, since it frequently identifies incidental findings of uncertain significance in people without symptoms, which can create unnecessary anxiety and further testing.
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