"Get an annual health check" is easy advice to give and surprisingly hard to act on, because most people have no real idea what's actually being measured. Cholesterol sounds familiar. Liver function sounds vaguely serious. Everything else is a bit of a black box.
Here's what's actually in a standard annual check, what a blood panel does and doesn't cover, and why these particular markers tend to be grouped together rather than tested one at a time.
Why cholesterol is almost always first on the list
Cholesterol testing looks at the fats circulating in your blood, split into a few different types (LDL, HDL, triglycerides) rather than one single number. It's one of the longest-standing markers in preventative health because it's linked to cardiovascular risk over time, not just how you feel today. It's also one of the few markers where a single test genuinely does establish a useful baseline, which is why it's often sold on its own as a standalone Cholesterol Test as well as inside broader panels.
What blood sugar is actually telling you
Blood sugar (glucose) markers show how your body is managing energy in the short term, and over the past few months if HbA1c is included. This matters even for people with no obvious symptoms, since early metabolic changes can show up in blood work well before they show up in how you feel day to day.
Why liver and kidney function get tested together
Liver and kidney function panels look at enzymes and waste markers that indicate how well these two organs are filtering and processing what's in your system. They're grouped together in most annual checks because they're both "quiet" organs, problems often don't produce obvious symptoms until they've been building for a while, which is exactly the kind of thing a baseline test is designed to catch early.
Where hormones fit into an "annual" check
Hormone testing is where general checks start to diverge by sex, since the most useful markers differ between men and women. This is also where a single well-rounded panel earns its price tag: rather than ordering hormone, thyroid and vitamin markers separately, a panel like Well Man Test or Well Woman Test bundles the sex-specific hormone markers in with the shared baseline (cholesterol, liver, kidney, diabetes) in one order.
Iron: the marker people forget until it's a problem
Iron studies (iron, ferritin, transferrin) show how your body is storing and transporting iron. It's included in most annual checks because iron deficiency is genuinely common, particularly in women, and it produces fairly generic symptoms (fatigue, low concentration) that are easy to attribute to something else entirely.
Do you need all of this every year?
Not necessarily as separate orders. This is largely why these markers get sold as panels rather than individual tests: cholesterol, blood sugar, liver, kidney and iron studies overlap enough that testing them together in one draw is more practical, and usually cheaper, than requesting each one on its own. If you want the simplest version of this baseline, the Essential Health Test covers cholesterol, blood count, liver, kidney and diabetes markers. If you want hormones and iron included too, that's the step up to Well Man or Well Woman.
What a blood panel doesn't cover
It's worth being direct about this: a blood panel is one part of a health check, not the whole thing. It doesn't replace a physical examination, blood pressure measurement, a discussion of your personal and family medical history, or a conversation with your GP about symptoms, lifestyle and screening that's appropriate for your age and risk factors. Some conditions are picked up through examination or imaging rather than blood markers at all.
An annual blood panel is best thought of as one useful input into a broader annual check-up, giving you and your GP a set of numbers to discuss, not a standalone substitute for seeing a doctor. If you have symptoms, a family history of a specific condition, or are due for age-appropriate screening (such as skin checks, cervical screening or bowel screening), those are conversations to have with your GP directly, alongside, not instead of, your blood results.
The short version
An annual health check isn't one test, it's a small cluster of markers chosen because they're each quiet, common, and worth catching early, and it works best as part of a broader annual check-up rather than a stand-alone assessment. If you're not sure where to start, our general and annual health checks hub breaks this down by focus area, or you can build your own panel if you'd rather choose your own markers.
This article is general information only and does not replace a physical examination, medical history review, or advice from your doctor. Blood test results are one part of a health check, not a complete assessment, and should be discussed with your GP alongside any symptoms, family history or screening appropriate for your age.
