Health · 6 August 2026 · Reviewed by the Live More Lifestyle Clinic Medical Team

What a Health Check-Up Actually Tells You, and What It Cannot

Dr Deepali Kapahi Founder & Medical Director, Live More Lifestyle Clinic

What a Health Check-Up Actually Tells You, and What It Cannot

A check-up is one of the most common things people ask us for, and one of the least understood. A panel of blood tests can pick up several serious conditions years before they cause a single symptom. It can also miss things people assume it covers. Here is what each part of the panel actually reads, what it cannot tell you, and how to decide what is worth testing.

The short version

A blood panel is good at finding slow, silent problems: blood sugar, cholesterol, kidney and liver changes, thyroid function and common deficiencies.
It is not a cancer screen. Tumour markers in a panel are not a substitute for the screening programmes that have real evidence behind them.
The evidence points at one thing above all: the value is not in the testing, it is in what somebody does with the result.

Does a check-up actually do anything?

It is worth starting with the uncomfortable answer, because most clinics skip it. When researchers pooled the large trials of general health checks offered to whole populations of adults, the checks did not reduce deaths overall, and did not reduce deaths from heart disease or cancer.¹ That is a real finding from a serious review, and anyone selling you an annual panel should be willing to tell you about it.

What that finding does not say is that testing is pointless. Look closer and the pattern is consistent: inviting everybody to be tested, handing them a printout and leaving it there changes very little. The benefit comes from finding a specific condition in somebody whose risk was already raised, and then actually treating it. The test is the cheap part. The follow-through is what changes an outcome.

1 in 3

Type 2 diabetes frequently goes undiagnosed for years, because the blood sugar rises gradually and the early stage produces nothing you would notice.² In Thailand’s national health examination survey, only about 63 percent of adults who had diabetes were aware of it, which leaves roughly one in three who did not know.³ Early kidney disease behaves the same way, and testing is the only way to know how well your kidneys are working.⁴ That is the honest case for testing. Not that a panel makes you healthier, but that some conditions give you no warning to act on.

So the useful question is not whether to have a check-up. It is which tests make sense for you, and who is going to sit down and read them with you. A panel chosen around your age, your history and your risks, followed by a conversation and a plan, is a different product from a printout of numbers. The rest of this article is about telling the two apart.

What the panel actually reads

Our own panels are grouped into thirteen areas, from a sixteen-test Starter through to a thirty-five test Comprehensive. Rather than list every line, here is what each group looks at and what it can genuinely flag.

Complete blood count

What it measuresRed cells, white cells, haemoglobin and platelets.

What it can flagAnaemia, signs of infection or inflammation, and some blood disorders. Anaemia affects around 30 percent of women aged 15 to 49 worldwide, and South-East Asia carries a large share of that burden.¹⁶

Blood sugar

What it measuresFasting glucose, and on the fuller panel HbA1c, which reflects roughly the last three months, plus insulin.

What it can flagDiabetes, and the prediabetes stage before it where there is still room to change course.²

Lipid profile

What it measuresLDL, HDL, total cholesterol and triglycerides.

What it can flagCardiovascular risk. Raised cholesterol produces no symptoms, so a blood test is the only way most people find out.⁵

Liver function

What it measuresSGOT and SGPT (also written AST and ALT), Gamma GT, bilirubin, albumin and alkaline phosphatase.

What it can flagFatty liver, the effects of alcohol or medication, and other liver strain. Worth knowing: these enzymes can read normal even when there is meaningful liver disease.⁶

Kidney function

What it measuresCreatinine and blood urea nitrogen, used to estimate how well the kidneys are filtering.

What it can flagEarly chronic kidney disease, which is typically silent until it is advanced.⁴

Thyroid

What it measuresTSH, plus free T3 and free T4 depending on the panel.

What it can flagAn underactive or overactive thyroid. Presentation ranges from no symptoms at all to something serious, and the common signs overlap with everyday tiredness, which is why it is measured rather than guessed at.¹⁵

Uric acid

What it measuresUric acid in the blood.

What it can flagGout risk, and a useful marker to have alongside the metabolic picture.

Inflammatory markers

What it measuresHigh-sensitivity CRP, ESR and homocysteine.

What it can flagInflammation somewhere in the body. These are non-specific by nature, so they are context rather than a diagnosis on their own.

Vitamin D and B12

What it measures25-hydroxy vitamin D and serum B12.

What it can flagA low or suboptimal level. Worth testing even in a climate like this one: in Thailand’s national survey about a third of people sat below the sufficiency threshold, though outright deficiency was uncommon.¹³ Sun avoidance, indoor work and sunscreen matter more here than latitude does.¹⁴

Hormones

What it measuresStress hormones such as DHEA and cortisol, and sex hormones. For women that includes oestradiol, FSH, LH and progesterone.

What it can flagA perimenopausal picture, or low testosterone in men. Timing matters, so these are read against your symptoms and, for women, your cycle.

What a blood panel cannot tell you

This is the part that usually gets glossed over, and it is the part most worth reading. A comprehensive panel is broad, but breadth is not the same as completeness.

Worth being clear about

“A blood test will tell me if I have cancer.”

Our Comprehensive panel does include tumour markers such as PSA, CEA, AFP and CA 19-9, and for women CA 15-3 and CA125. They have a genuine use, mostly in monitoring somebody who has already been diagnosed, and as a baseline a doctor can compare against later.

What they are not is a cancer screen. In people without symptoms these markers produce both false alarms and false reassurance. When one study ran an eight-marker panel across more than 20,000 people with no symptoms, a positive result turned out to mean cancer between roughly 2 and 4 percent of the time, so the overwhelming majority of alarms were false.⁹ Each false alarm carries its own cost in scans, biopsies and months of worry.

This is why screening bodies recommend against using CA125 to look for ovarian cancer in women at average risk. The trials found it did not reduce deaths, and it led to surgery in women who turned out not to have cancer.⁷ PSA is treated as a decision to weigh up with your doctor rather than an automatic test, and is not recommended at all from age 70.⁸

A normal tumour marker does not mean you do not have cancer. What does have evidence behind it is organised screening for specific cancers: bowel screening, mammography and cervical screening, each in a defined age group.^10,11,12 If you take one thing from this article, let it be that those are worth arranging, and that no blood panel is a substitute for them.

Worth being clear about

“Everything came back normal, so I am fine.”

A reference range is a statistical band drawn from a population, not a personal target. A result can sit inside the range and still be a clear move from where you were two years ago, which is why a trend over time often tells you more than a single reading.

A blood panel also does not measure a lot of what matters. It does not take your blood pressure, and hypertension is worth singling out here: most people who have it feel nothing, around 44 percent of them do not know they have it, and the only way to find it is to measure it.¹⁷ A panel also does not look at your skin, check your eyes or your hearing, image anything, or ask how you are sleeping and drinking. Those come from an examination and an honest conversation, not from a tube of blood.

Who should test what, and when

There is no single schedule that fits everyone, and a clinic that hands you one without asking about you is guessing. As a rough guide, this is where attention usually goes, and what a blood panel will not cover at each stage.

Stage	Where attention usually goes	What bloods will not cover
20s and 30s	A baseline while you are well: blood count, glucose, lipids, thyroid, vitamin D	Cervical screening, sexual health, mental health, skin and dental checks
40s	Metabolic drift: HbA1c, lipids, liver, uric acid, and the weight and waist trend	Blood pressure, eye checks, breast awareness, bowel screening where it is offered
50 and beyond	Cardiovascular and kidney function, thyroid, and hormone and bone health	Bowel cancer screening, mammography, blood pressure monitoring
Any age, with risk factors	Targeted testing shaped by family history, weight, alcohol and medication	The conversation that decides which tests are actually useful for you
Any age, with symptoms	A work-up aimed at the symptom, not a general package	A check-up is the wrong tool here. See a doctor and describe what is happening.

Getting a result worth having

A few ordinary things make the difference between a clean result and one that has to be repeated. None of them are complicated.

Fast if you are asked to. Glucose and triglycerides in particular are read fasting, usually eight to twelve hours. Water is fine, and you should keep drinking it.
Keep taking prescribed medication unless your doctor has specifically told you to hold it. Do not stop anything on your own before a test.
Tell us what supplements you take. Some over-the-counter supplements interfere with laboratory assays and can push a result in either direction. It is one of the most common avoidable causes of a confusing panel.
Go easy the night before. Alcohol and hard training can both move liver and muscle markers enough to muddy the picture.
Mind the timing. Several hormones follow a daily rhythm and are best drawn in the morning. For women, some sex hormones only make sense on a particular day of the cycle.
Reschedule if you are unwell. An acute infection lifts inflammatory markers, and you will not learn much from them until it has passed.

What actually happens

The sequence matters more than the size of the panel. This is how we run it.

1 A conversation first Your history, your family, your medication and how you live. That is what decides which tests are worth running for you.
2 The draw A single blood draw covers the panel. It takes a few minutes, and the fasting only matters for part of it.
3 The results Processed by an accredited laboratory. Most results are back within a couple of working days.
4 Reading them together A doctor goes through the report with you, in context, against how you actually feel. A number on its own is not a diagnosis.
5 A plan, and a point to re-test What to change, what to treat, what to refer on, and when it is worth looking again. This is the step that makes the rest of it count.

Do not wait for a check-up

These need a doctor now, not a panel next month

Chest pain, breathlessness, or a pounding or irregular heartbeat
Unexplained weight loss, night sweats, or a fever that will not settle
Blood in the stool or urine, or a change in bowel habit lasting more than a few weeks
A new lump, a mole that is changing, or a sore that is not healing
Sudden severe headache, weakness on one side, or trouble speaking

This article is general education, not a diagnosis. A routine panel is designed for people who feel well. If something is wrong now, be seen now.¹⁸

How we approach it at Live More

We run two standard panels, a sixteen-test Starter and a fuller Comprehensive, plus a focused hormone check-up, and you can see exactly what is in each on our men’s and women’s check-up pages. What we try not to do is sell the biggest panel by default. The consultation comes first, because the point of testing is to answer a question worth asking, and a doctor reads the results with you afterwards rather than emailing you a PDF. If your results are normal we will tell you that plainly, and you will not leave with a bag of things to buy. The first thirty-minute consultation is free, and you are welcome to come and talk it through before committing to anything.

Common questions

How often should I have a health check-up?

There is no single correct interval, and recommendations differ between countries and between guidelines. It depends on your age, your family history and what was found last time. For a well adult with no risk factors, a baseline and then a repeat every couple of years is a reasonable starting point to discuss. If you are managing something specific, your doctor will set the interval around that.

Do I need to fast before a blood test?

Usually yes, for eight to twelve hours, because fasting glucose and triglycerides are both affected by a recent meal. Keep drinking water, and keep taking prescribed medication unless you have been told otherwise. We confirm what applies to your panel when you book.

What is the difference between the Starter and Comprehensive panels?

The Starter is a sixteen-test baseline covering blood count, blood sugar, liver, kidney, lipids, uric acid, thyroid and vitamin D. The Comprehensive covers the same ground and adds HbA1c and insulin, fuller thyroid testing, stress and sex hormones, growth factors, inflammatory markers, tumour markers and vitamin B12. Both are listed test by test on our check-up pages.

Will a check-up tell me if I have cancer?

No, and it matters to be clear about that. Tumour markers can be part of a comprehensive panel, but they are not a screening test for people without symptoms. They produce false alarms and false reassurance, and a normal result does not rule cancer out. Screening that does have evidence behind it, such as bowel, breast and cervical screening, is separate and worth arranging in the recommended age groups.^7,8,9

I feel completely fine. Is there any point?

That is the one genuinely good argument for testing. Raised blood sugar, raised cholesterol and early kidney disease generally cause no symptoms at all, so feeling well does not rule them out.^2,4,5 The counterweight is that testing only helps if the result leads to something. If you are well and low risk, a smaller targeted panel is often the more sensible choice than the largest one on the menu.

My results are all within range. Does that mean nothing is wrong?

It means nothing fell outside the reference range on the day. A range is drawn from a population rather than from you, so a result can be technically normal and still represent a shift from your own baseline. It is also worth remembering that a blood panel does not cover blood pressure, imaging or examination findings. Normal bloods are reassuring, but they are not a clean bill of health.

Can I have a check-up instead of seeing a doctor about a symptom?

No. A routine panel is built for people who feel well, and it is a poor tool for chasing a specific problem. If you have a symptom, the right approach is an assessment aimed at that symptom, which may well involve entirely different tests.

References

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American Diabetes Association Professional Practice Committee. “Diagnosis and Classification of Diabetes: Standards of Care in Diabetes 2025.” Diabetes Care, 2025;48(Suppl 1):S27–S49. View source
Aekplakorn W, et al. “Diabetes trends and determinants among Thai adults from 2004 to 2020.” Scientific Reports, 2025;15:31620. View source
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). “Chronic Kidney Disease Tests & Diagnosis.” niddk.nih.gov, accessed 2026. View source
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US Preventive Services Task Force. “Screening for Breast Cancer: US Preventive Services Task Force Recommendation Statement.” JAMA, 2024;331(22):1918–1930. View source
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Chailurkit L, Ongphiphadhanakul B, Aekplakorn W. “Update on vitamin D status in sunshine-abundant Thailand, 2019–2020.” Nutrition, 2023;116:112161. View source
Nimitphong H, Holick MF. “Vitamin D status and sun exposure in southeast Asia.” Dermato-Endocrinology, 2013;5(1):34–37. View source
Chaker L, Bianco AC, Jonklaas J, Peeters RP. “Hypothyroidism.” The Lancet, 2017;390(10101):1550–1562. View source
World Health Organization. “Anaemia (fact sheet).” who.int, updated 2025. View source
World Health Organization. “Hypertension (fact sheet).” who.int, updated 2025. View source
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