Most men over 45 have never seen their own numbers. They have had blood taken at some point, been told it was "fine", and left without a copy. Fine is not a number. It also is not the same as optimal, and it is not the same as unchanged since last time, which is usually the more useful piece of information.
This is a practical list of what to ask for, what each test actually tells you, and which results should change what you do next. It is written to be taken to an appointment rather than to replace one.
Why the mid-forties is the right time
Not because something dramatic happens at 45, but because this is the decade where slow changes become measurable while they are still easy to influence. Blood pressure creeps. Fasting glucose drifts. Lipids shift. Vitamin D falls in men who work indoors. None of it announces itself, and all of it responds well to being caught early.
The second reason is that a baseline is worth more than a single reading. A cholesterol result at 46 is mildly interesting. The same result compared against 45, 47 and 48 tells you a direction, and direction is what you act on.
The third reason is less comfortable. Men consult less often and later than women across essentially every health system that measures it. A scheduled panel replaces a decision you would otherwise keep postponing.
How to prepare so the numbers mean something
A badly taken sample produces a result that looks like information and is not. Five things change the outcome.
Fast if you are asked to. Twelve hours, water allowed. Triglycerides in particular move substantially with recent meals, and glucose obviously does.
Go in the morning. This is essential for testosterone, which follows a daily rhythm, and harmless for everything else.
Skip heavy training for 48 hours. Intense exercise raises creatine kinase, can nudge creatinine, and temporarily affects liver enzymes. A hard session two days before a panel is a common reason for an alarming result that resolves on retest.
Do not start or stop supplements the week before. Biotin at high doses interferes with some immunoassays, including certain thyroid and hormone tests, and can produce genuinely misleading numbers. If you take a hair-and-nail product, mention it.
Be honest about alcohol. Not because anyone is judging, but because GGT and triglycerides will say it anyway, and the clinician interpreting them needs to know whether the pattern is habitual or was last weekend.
What to check before you spend anything
Reading the evidence is the slow half of this. Reading the label is the fast half, and it eliminates most products in under a minute. The Label Test is the five-point version we apply to every formula, ours included.
The core panel
Full blood count
The basic one, and easy to dismiss. It picks up anaemia, which in a man is never simply anaemia, it is a reason to ask why. It also flags infection and some blood disorders. If haemoglobin is low in a man over 45, that warrants investigation rather than an iron supplement.
Lipid panel
Total cholesterol, LDL, HDL and triglycerides. Ask specifically whether the panel is fasting, since triglycerides in particular move with recent meals.
The number worth asking about that is often left off is ApoB or Lp(a). ApoB counts the atherogenic particles rather than the cholesterol they carry, which makes it a better marker of risk in some men, particularly those with metabolic syndrome. Lp(a) is largely genetic, needs measuring only once in a lifetime, and is a genuinely useful thing to know if there is early heart disease in your family.
HbA1c
Average blood glucose over roughly three months, so it does not care what you ate yesterday. This is the single most useful metabolic marker for most men and it catches the long pre-diabetic slide that a one-off glucose reading misses.
Blood pressure
Not a blood test, but it belongs in the same conversation and it is the most under-treated risk factor in men this age. One reading at a clinic is not enough; a home monitor over a week is far more informative, and clinic readings are systematically inflated by the fact that you are sitting in a clinic.
Kidney and liver function
Creatinine and eGFR for kidneys, ALT and GGT for liver. Both matter more once you are taking any regular medication, and GGT in particular tends to reflect alcohol intake honestly, whatever you told the questionnaire.
One caveat if you lift: creatinine is a muscle breakdown product, so a muscular man can show a slightly raised creatinine and a slightly lowered eGFR without anything being wrong with his kidneys. Cystatin C is an alternative marker that is not affected by muscle mass, and it is worth asking about if this comes up.
hs-CRP
High-sensitivity C-reactive protein, a general marker of inflammation. It is non-specific, meaning a raised result tells you something is going on rather than what, and any recent infection will elevate it. Used alongside lipids it adds useful context to cardiovascular risk. Not worth measuring while you have a cold.
Uric acid
Often omitted and cheap to add. Raised uric acid is the mechanism behind gout, which becomes considerably more common in men from the forties onward and which most men do not see coming until they wake up unable to put weight on a toe. It also tracks with metabolic syndrome.
The ones you often have to ask for
Vitamin D
Frequently not included by default and frequently low, especially in winter and in men who work indoors. Worth measuring rather than guessing, because it is one of the few results that leads to a clear, cheap, specific action. Then re-measure after a few months of correcting it rather than assuming it worked.
Ferritin and B12
Ferritin reflects iron stores. Note that it also rises with inflammation, so a normal ferritin alongside a raised hs-CRP does not fully rule out low iron. B12 absorption declines with age and is reduced further by metformin and long-term proton pump inhibitors, so if you take either, ask for it by name.
Thyroid function
TSH at minimum. An underactive thyroid produces fatigue, weight change, low mood and low libido, which is exactly the symptom cluster men in this age group tend to attribute to ageing or to testosterone. It is cheap to rule out and frequently the actual answer.
Testosterone, done properly
If you are going to ask, ask correctly, because a badly taken testosterone result is worse than none.
Total testosterone should be measured on a morning sample, ideally before 10am, and confirmed with a second sample on a different day before anyone draws conclusions. Levels vary substantially through the day and between days. Ask for SHBG alongside it, since that determines how much is actually available, and for LH if the total comes back low, because that helps distinguish where the problem sits.
Two things depress a reading temporarily and are worth ruling out before anyone concludes anything: acute illness, and a sustained period of poor sleep. Both are common and both resolve.
One honest note: a single low-ish reading in isolation is not a diagnosis, and it is not on its own a reason to start treatment. It is a reason for a proper endocrine workup. The supplement industry has a strong commercial interest in blurring that line. We are in the supplement industry and we are telling you it is blurred.
PSA
The prostate-specific antigen test is genuinely a discussion rather than a default. It can detect prostate cancer early. It also produces false positives that lead to biopsies for cancers that would never have caused harm. Guidance in most countries is shared decision-making from around 50, or earlier at 45 if you are Black or have a father or brother with prostate cancer.
If you do test, several ordinary things raise PSA and cause avoidable alarm. Ejaculation within 48 hours. A long bike ride. A recent urinary infection or catheter. A digital examination immediately before the blood draw. Abstaining from cycling and sex for two days beforehand is a small inconvenience that prevents a fortnight of worry.
If a result comes back mildly elevated, the usual next step is a repeat rather than a biopsy, and there are refinements such as free-to-total PSA ratio and PSA density that help interpret a borderline number. Ask about those before agreeing to anything invasive.
What is not in dispute: urinary symptoms deserve a conversation regardless of whether you test. We cover the wider picture in prostate health after 50.
What to do with the results
Get a copy. Every time. Most systems let you download them. A number without its history is a fraction as useful.
Look at the reference range, then look past it. Ranges are population-derived, and being at the very bottom of normal is not the same as being comfortably mid-range. It is a reasonable thing to raise with your doctor rather than something to self-treat.
Track direction. A value drifting steadily toward the edge of a range over three years is more actionable than a single result sitting just outside it.
Change one thing at a time. If you correct vitamin D, start creatine, cut alcohol and add a circulation supplement in the same fortnight, your next panel tells you nothing about which of them did what.
Results that get misread
A handful of patterns account for most unnecessary worry, and most unnecessary reassurance.
One value marginally outside the range. Reference ranges are built so that a small percentage of healthy people fall outside them by definition. A single marginal flag on a panel of thirty markers is usually noise. The response is a repeat, not a diagnosis.
"Normal" that is drifting. The opposite error, and the more expensive one. HbA1c moving from the low end to the top of normal across four years is a clear trajectory that will never trigger a flag until it has already arrived.
Total testosterone read without SHBG. A high SHBG can leave a man with a respectable total and much less available than the number implies. Reading the total alone is how this gets missed in both directions.
Raised liver enzymes after training. Common, benign and alarming. Retest after a week without heavy lifting before anyone investigates further.
Ferritin masked by inflammation. Covered above, and the reason hs-CRP earns its place on the same form.
How often to repeat
Annually is a reasonable default for a generally healthy man over 45, and that is largely about building the trend rather than expecting change.
Sooner in three situations. After correcting something, retest at eight to twelve weeks so you know whether the correction worked, which applies particularly to vitamin D and B12. After starting a medication that affects the markers on the panel. And whenever a symptom appears that the panel might explain.
Testosterone is the exception to annual thinking: if the first result is low it needs repeating within weeks, not next year.
Private panels and at-home kits
Worth being even-handed here, because both have a real place and both are oversold.
The genuine advantages are speed, access to markers a GP may not routinely fund such as ApoB or Lp(a), and getting the full numbers rather than a verbal "fine".
The genuine drawbacks matter more than the marketing admits. A finger-prick sample is less reliable than a venous draw for several markers. A panel of eighty tests on an asymptomatic man will produce something outside range by pure probability, and that leads to investigation of nothing. And a result without a clinician who knows your history is a number rather than an interpretation.
If you use one, take the results to your doctor rather than to a forum, and be sceptical of any service that sells you a supplement on the strength of its own test.
Where supplements fit, and where they do not
Bloodwork is what makes a supplement routine intelligent rather than decorative. A vitamin D result tells you whether to take vitamin D. A B12 result tells you whether that is your fatigue. Without the numbers you are buying based on an article, which is how men end up with eleven bottles and no idea which ones are doing anything.
Some things are not measured by a blood test, and it is worth being straight about that too. Circulation efficiency, which underpins a lot of what men notice changing in this decade, does not show up as a line on a standard panel. That does not make it imaginary, but it does mean you judge it on how you feel over weeks rather than on a result. We explain the mechanism in circulation and men's vitality.
For which supplements are actually worth taking once you have your numbers, see what supplements a man over 45 should take. For the broader picture of what changes in this decade, start with men's vitality after 45.
A short script for the appointment
Appointments are short. This tends to work better than a printed list of forty tests.
"I would like a baseline. Can we do a full blood count, lipids including ApoB if that is available, HbA1c, kidney and liver function, vitamin D, ferritin, B12 and thyroid. I would also like to discuss whether a PSA is appropriate for me, and I would like a copy of the results."
If fatigue, low mood or low libido are why you are there, add: "I would also like morning testosterone with SHBG, and I understand it needs repeating to mean anything."
Some of these will not be available to you free of charge depending on where you live and what your doctor judges necessary. That is a reasonable conversation to have rather than a reason to skip the appointment.
This article is general information, not medical advice. Testing decisions should be made with a qualified clinician who knows your history. These statements have not been evaluated by the Food and Drug Administration.