Health Check-Ups by Age: Which Tests Are Worth It

A useful adult check-up is a short list of specific tests on separate schedules — blood pressure, lipids, glucose, age-appropriate cancer screening, vaccines, vision and hearing — not one annual sweep of everything a lab can measure. The tests people buy most eagerly, such as tumour marker panels, whole-body MRI and broad hormone screens, are the ones with the weakest case and the greatest capacity for harm. A Cochrane review of 17 randomised trials covering more than 250,000 participants found that systematic general health checks have little or no effect on all-cause mortality, while producing unnecessary tests and treatments.

Why "more tests is better" is wrong#

This is the point most check-up articles skip, and it is the one that changes behaviour. The intuition is that an extra test can only help — worst case, it comes back normal. In practice every test carries harm as well as benefit, and in a person with no symptoms the balance tips negative surprisingly fast.

Start with the arithmetic. Suppose a test has 95 percent specificity, meaning it correctly clears 95 of every 100 healthy people. That is a good test. Now order a panel of twenty such tests on a perfectly healthy person: the chance that at least one result falls outside the reference range is about 64 percent. Nothing is wrong with them. The reference range is a statistical interval that, by construction, excludes 5 percent of healthy people.

What follows is the cascade. An abnormal number triggers a repeat, then imaging, then a specialist, sometimes a biopsy. Each step carries procedural risk, radiation, cost and time — plus anxiety, which is routinely dismissed and shouldn't be. Women who receive a false-positive mammogram report elevated anxiety for months after cancer has been ruled out.

The second and less obvious harm is overdiagnosis. This is not a mistake. The test finds real disease that genuinely exists. The problem is that this particular disease would never have caused symptoms in the person's remaining lifetime. South Korea provides the textbook case: when thyroid ultrasound was bundled into commercial check-ups, detected thyroid cancer rose roughly fifteenfold over two decades. Mortality from thyroid cancer did not move at all. Tens of thousands of people got surgery, lifelong hormone replacement and a cancer diagnosis, with no survival gain to show for it.

The practical conclusion is that a good check-up is deliberately short. The goal is not to inspect everything but to catch the few conditions that are common, silent for years, and meaningfully treatable when caught early. There are not many of those.

The three tests almost every adult needs#

Blood pressure#

The best value in all of medicine: free, instant, harmless, and aimed at the single largest modifiable risk factor for stroke, heart attack and kidney failure. USPSTF gives it grade A for all adults 18 and over. Hypertension produces no symptoms until it produces organ damage, and roughly two in five people who have it do not know.

Check at least every one to two years, annually from 40 or if readings run above 130/85. One elevated office reading is not a diagnosis — confirmation requires repeat measurement, ideally home monitoring or 24-hour ambulatory recording, because white-coat effect is common enough to matter.

Lipid profile#

Total cholesterol, LDL, HDL and triglycerides. A baseline in your twenties is reasonable, then roughly every four to six years if normal. From 40 the number stops being a standalone target and becomes an input: USPSTF's grade B recommendation is to offer a statin to adults aged 40–75 who have at least one cardiovascular risk factor and an estimated 10-year risk of 10 percent or higher. That combined risk estimate, not the LDL value alone, is what should drive the decision.

Glucose or HbA1c#

USPSTF recommends screening for prediabetes and type 2 diabetes in adults aged 35 to 70 who have overweight or obesity — grade B, every three years is the usual interval. Type 2 diabetes runs silent for years, so a substantial share of cases are found only when a complication arrives. HbA1c is the more practical test: no fasting, and it reflects the previous three months rather than one morning.

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Ages 18–39: a short list, not an empty one#

Serious disease is uncommon at this age, which means any given test produces many false alarms per real finding. The justified list is correspondingly brief.

Blood pressure every one to two years. A lipid baseline once in your twenties. Height, weight and waist circumference at routine visits. Cervical cancer screening from 21 for women (details below). One-time HIV testing for everyone aged 15–65, repeated if risk factors are present, and one-time hepatitis C testing for all adults aged 18–79 — both graded by the USPSTF. Depression screening, which is easy to forget but carries a grade B recommendation for all adults.

What is almost never warranted here: a resting ECG in someone without symptoms, "preventive" abdominal ultrasound, a thirty-item metabolic panel, or thyroid hormones without a clinical reason. These generate more problems than they solve at this age.

Ages 40–49: the decade of risk arithmetic#

Two things change. Cardiovascular risk becomes calculable and worth calculating, and the first cancer screening programmes begin.

Blood pressure moves to annual. Lipids continue every four to six years, now feeding into a 10-year risk estimate. Glucose or HbA1c every three years if you meet the weight criteria. Mammography starts: in 2024 the USPSTF moved to recommending biennial screening for all women aged 40 to 74, a shift from the previous position that women in their forties should decide individually. Colorectal screening begins at 45.

Vision deserves a mention because nobody thinks about it. Glaucoma risk climbs after 40, it is entirely painless, and the visual field it destroys does not come back. An eye examination every two to four years is sensible, annually if a close relative has glaucoma or if you have diabetes.

Ages 50–64: where screening pays the most#

This is the range in which screening earns its keep. Disease prevalence is high enough that positive findings are more often real, and treatment still buys meaningful years.

The full colorectal, breast and cervical programmes are all active. Two further items enter as conversations rather than defaults. Low-dose CT lung screening carries a grade B recommendation for adults aged 50–80 with a 20 pack-year history who currently smoke or quit within the past 15 years. PSA screening for prostate cancer is grade C for men aged 55–69, meaning it should be an individual decision after a genuine discussion of harms — overdiagnosis is estimated to affect a substantial minority of the cancers it detects.

65 and over: knowing when to stop#

After 65 the harder question is not what to add but what to discontinue. Screening only makes sense if life expectancy exceeds the lead time over which the detected disease would have caused harm — typically seven to ten years for cancer programmes. Continuing to screen someone with serious competing illness delivers the harms without the benefit.

Priorities shift toward function. Hearing, because untreated loss drives social isolation and tracks with faster cognitive decline. Vision, for cataract, glaucoma and macular degeneration. Falls risk and balance. Bone density in women from 65, which is a grade B recommendation. A one-time ultrasound for abdominal aortic aneurysm in men aged 65–75 who have ever smoked. Vaccination stays active and matters more than at any earlier age.

What generally stops: cervical screening after 65 with an adequate prior history — the USPSTF gives that a grade D, meaning actively recommended against. PSA testing after 70, also grade D. Mammography and colonoscopy taper on a case-by-case basis, judged on health status rather than birthday alone.

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Vaccines, vision and hearing#

These three rarely appear in a commercial check-up package, which says more about what is profitable than about what is useful.

Adult vaccination is not a children's topic. Tetanus-diphtheria needs a booster every ten years for life and is the single most commonly lapsed adult vaccine. Influenza annually, with the strongest case after 60, in pregnancy, and in anyone with heart disease, lung disease or diabetes. Pneumococcal vaccination for older adults and for younger adults with chronic conditions. Shingles vaccination from 50, which substantially reduces the risk of post-herpetic neuralgia — one of the more punishing chronic pain syndromes. HPV vaccination for adolescents and young adults. The CDC publishes an adult schedule by age that is updated annually and is the practical reference.

Vision. The two silent threats are glaucoma and diabetic retinopathy. With diabetes, a dilated retinal examination is due annually from diagnosis regardless of how well you see.

Hearing. Loss develops slowly enough that people adapt without noticing; family members usually notice first. From 60, checking every one or two years is reasonable, and sooner if you find yourself thinking that everyone has started mumbling.

The schedule at a glance#

Test	18–39	40–49	50–64	65+
Blood pressure	Every 1–2 years	Annually	Annually	Annually
Lipid profile	Baseline once in your 20s	Every 4–6 years, with risk score	Every 4–6 years	Clinician's judgement
Glucose or HbA1c	If risk factors present	Every 3 years from 35 with overweight	Every 3 years	Every 3 years to 70
Cervical cancer	From 21: cytology every 3 years; from 30, HPV testing every 5 years	Same	Continue to 65	Stop at 65 with adequate history
Breast cancer	Not screened	Mammography every 2 years from 40	Every 2 years	Every 2 years to 74
Colorectal cancer	Not screened	From 45: colonoscopy every 10 years or annual FIT	Same	Selective from 76 to 85
Lung cancer (LDCT)	Not screened	Not screened	Annually from 50 if 20 pack-years	Annually to 80 if eligible
Vaccination	Td every 10 years, flu annually	Same	Plus shingles from 50	Flu, pneumococcal, shingles, RSV, COVID-19
Vision	If symptomatic	Every 2–4 years	Every 1–2 years	Annually
Hearing	If symptomatic	If symptomatic	If symptomatic	Every 1–2 years

The three cancer programmes in detail#

Cervical cancer. USPSTF grade A: cytology every three years from 21 to 29, then from 30 to 65 a choice of cytology every three years, high-risk HPV testing every five years, or co-testing every five years. Screening under 21 is graded D — HPV infections in that age group usually clear on their own, and screening causes more harm than good. The task force stresses that participating in screening at all matters far more than which of the three strategies you pick. HPV vaccination reduces risk substantially but does not replace screening.

Breast cancer. Grade B for biennial mammography from 40 to 74. Above 74 the evidence is insufficient — a grade I statement, not a recommendation against. Both digital mammography and tomosynthesis are acceptable. Note that biennial, not annual, is what the evidence supports at population level: annual imaging roughly doubles the cumulative false-positive rate for a small gain in detection.

Colorectal cancer. Grade A from 50 to 75, grade B from 45 to 49, grade C (selective, individualised) from 76 to 85. Uniquely among cancer screening programmes, this one reduces incidence as well as mortality, because polyps are removed before they become cancer. Colonoscopy every ten years and annual FIT are considered comparably effective when done consistently.

What gets sold but isn't recommended#

Tumour marker panels. CA-125, CEA, CA 19-9, AFP and the rest were developed to monitor known cancers, not to find new ones. As screening tools in asymptomatic people they fail in both directions: they rise with inflammation, smoking, pregnancy and benign tumours, and they stay normal in many early-stage cancers. PSA is the partial exception, and even it comes with a grade C and an overdiagnosis warning.

Whole-body MRI or CT. The ACR's position is that there is no documented evidence total body screening is cost-efficient or effective in prolonging life, and that it identifies numerous non-specific findings which do not improve health but do generate follow-up testing, procedures and significant expense. Renal cysts, thyroid nodules, hepatic and adrenal lesions turn up in a large share of healthy scans. CT adds radiation on top. The recognised exceptions are hereditary cancer syndromes such as Li-Fraumeni, where surveillance imaging has demonstrated benefit.

Broad hormone panels. Thyroid, cortisol, sex hormones and insulin measured in someone with no symptoms mostly produce borderline values nobody can act on. Subclinical TSH shifts often normalise spontaneously. Cortisol varies severalfold across the day. Testosterone depends on the time of the sample and the previous night's sleep.

Everything else in the deluxe package. Resting ECG or echocardiogram in an asymptomatic low-risk adult, "preventive" thyroid ultrasound, thirty-analyte chemistry panels, IgG food-sensitivity testing (no evidentiary basis at all), and microbiome or genetic panels promising a personalised diet.

What to do in practice#

1. Write down your family history — which first-degree relatives had what, and at what age. It is the single most informative input into a screening plan, and it costs nothing.
2. Check which rows of the table above you have not covered in the last three to five years. Start there, not with a new package.
3. From 40, ask for a 10-year cardiovascular risk estimate. One number organises most of the other decisions.
4. When a package is offered, ask what you would do differently for each line item if it came back abnormal. If there is no answer, that line does not belong.
5. Do not add tests because you happen to be at the lab. Every extra analyte is another chance at a false alarm and the cascade behind it.

The irony of prevention is that the interventions with the largest effect on how long you live are not found in a laboratory at all: not smoking, moving regularly, sleeping properly, and keeping blood pressure and weight in range. Screening does not substitute for any of that. It catches the small number of things that develop in silence.