You train hard, you watch your recovery and your food, but you don't know your blood values. In the Netherlands you can have them measured yourself, without a GP referral. You arrange it online, get blood drawn at a location, and get your data back with an explanation. You pay for it yourself, because testing on your own initiative isn't in basic insurance.
This guide is your starting point. Which values you can follow as an athlete, how to arrange it, what it costs, and whether it's reliable. The depth per marker is in the posts we link to.
Honest? Most athletes steer by feel and the scale. Your blood tells part of the story you'd otherwise miss.
Can you test without a referral as an athlete?
Yes. You request a blood test yourself from a private provider, without a GP. You decide which values to measure. For a targeted sports check without a complaint, you don't have to ask anyone's permission.
That's handy, because GPs test on medical necessity. A ferritin or testosterone value "because you want to optimise" usually falls outside that.
Which blood values do you measure as an athlete?
It depends on your goal. Strength athletes often look at hormones and recovery, endurance athletes at iron and inflammation. A few commonly tracked data points, and where to read further:
- Hormones and recovery, as in testosterone, symptoms and blood values.
- Strength and supplements, worked out in blood values for strength athletes.
- Iron, recovery and overtraining, for endurance athletes.
Want a broad baseline? The 360 Health panel is a logical starting point. Prefer to build your own? You can via build your test.
How do you arrange it yourself?
In four steps. You pick your test online, get a digital referral, get blood drawn at a location, and read your data back with a doctor's explanation. No waiting room, no conversation to justify your choice.
The full approach is in testing blood values without a GP as an athlete.
What does it cost, and is it reimbursed?
You pay for a sports blood test yourself. Testing on your own initiative isn't in basic insurance, but it also costs you no deductible, because you settle directly. On the GP route, the lab usually does count toward your deductible.
The full sum, including when self-testing is cheaper, is in are sports blood tests covered by insurance.
Blood test without a referral or via the GP?
It depends on your goal. The GP is there for symptoms, the private route for data and control. This table sets it side by side.
| What matters to you | Via the GP | Without a referral (private) |
|---|---|---|
| Reason | Symptom or medical necessity | Tracking and optimising performance |
| Who picks the markers | The doctor, on indication | You, self-selected |
| Speed | An appointment first | Arranged online right away |
| Cost | Reimbursed, lab often counts toward deductible | You pay yourself, separate from deductible |
Is a blood test without a referral reliable?
Yes, as long as the draw and the lab are sound. Blood a professional draws from your vein that goes straight to an accredited lab is as reliable as the GP route. The RIVM is mainly critical of standalone self-tests, which often have little data on how well they measure (RIVM, 2022).
With venous collection at a location, that doubt matters far less.
What does testing give you as an athlete?
Mostly direction. You train and eat on a plan, but you don't always know whether your body is keeping up. Blood values give part of that answer, alongside how you feel and how you perform.
Think of iron quietly dropping under high training volumes, or a recovery marker staying high longer than you'd want. You don't see that on the scale. A measurement can surface such a signal earlier, though it stays a snapshot.
The best part comes over time. One value is a photo, a series of measurements is a film. That trend says more about your direction than a single result.
When is the best time to test around your training?
Timing matters for some values. Right after a hard session, markers like CK and CRP can run temporarily high, simply from the effort. That then says little about your baseline.
For a calm picture, many athletes pick a moment with a few easy days before it. Hormones swing through the day, so a fixed time helps you compare honestly.
It's not exact science. What's sensible for you depends on your goal, and a doctor can help place your result in the right context.
Common misconceptions among athletes
A few stubborn assumptions surround self-testing. Three we hear often, and how it really works.
- "One measurement says everything." Not really. A value is a snapshot, a trend over time says more.
- "The more markers, the better." Not necessarily. Testing targeted to your goal often beats a long list with no question behind it.
- "An abnormal value is a problem." Not automatically. In athletes some values deviate from training itself. Context decides what it means.
How long does it take, and what do you do with your data?
After your draw, your result usually follows within a few business days. You get not just numbers, but a report from a BIG-registered doctor explaining what your values may mean in your case.
Use your data to build a trend, not to steer on a single measurement. If you want treatment or you're worried, your GP remains the right point of contact.
Which markers fit which goal?
No fixed rule, but a handy starting point. Which data points make sense depends on your sport and your question. This table links a goal to markers athletes often follow for it.
| Your focus | Commonly tracked data points |
|---|---|
| Strength and muscle growth | Testosterone, SHBG, haematocrit |
| Endurance and recovery | Ferritin, iron, hsCRP |
| Metabolic and body composition | HbA1c, fasting glucose, lipids |
| General baseline | Full blood count, vitamin D, thyroid |
Treat these rows as a starting point, not a prescription. Many athletes start broad with a baseline and then zoom in on what stands out.
How often do you get blood drawn as an athlete?
There's no fixed rule for it. It depends on your goal and whether you're tracking something. Those who want to build a trend often pick a few fixed moments per year, for example at the start and end of a training block.
If you change something major in your training, food or supplements, a measurement before and after can show what happens to your values. One thing stays the same: a trend says more than a single measurement.
Don't test more often than is useful. Too many one-off measurements create noise instead of insight.
What do reference ranges mean for athletes?
Reference ranges often come from the general population, not from trained athletes. So a value can be "normal" while it doesn't feel quite right for your goal, or the other way around.
A well-known example is creatinine, which can come out higher in people with a lot of muscle mass without anything being wrong with your kidneys. Haematocrit too sits at the top of the range for some endurance athletes. So context decides what a number means.
That's why a trend over time, together with a doctor's explanation, is more valuable than a single comparison with a general range.
What does a doctor add to your data?
A row of numbers with the odd deviation says little without context. In athletes some values deviate from training itself, and then a red arrow isn't an alarm.
That's why at Enhanced Health you get a report from a BIG-registered doctor with your result. It places your values in context and explains in plain language what they may mean in your case. It stays insight, not a diagnosis or treatment plan.
Common mistakes reading your blood values
The biggest trap is steering on a single number. Blood values fluctuate, and a snapshot can mislead. A few mistakes we see often.
- Drawing conclusions from one measurement instead of a trend.
- Seeing a value just outside the reference range as a problem right away.
- Testing right after a hard session and being startled by a temporarily high marker.
- Measuring so many markers at once that you can't see the wood for the trees.
Use your data to ask questions, not to give yourself a diagnosis. That last part belongs with a doctor.
Which athletes benefit most from testing?
In principle anyone who trains with intent and wants to know whether their body is keeping up. Still, there are groups for whom data tends to pay off a little more.
- Endurance athletes with high volume, whose iron and ferritin can quietly drop.
- Strength athletes who want to follow their hormones and recovery across a block.
- Athletes adjusting their food or supplements who want to see the effect.
- Anyone who feels structurally tired despite good training and sleep.
For most others, a broad baseline is a fine start. You don't have to measure everything to learn something.
Start broad, then refine
A common mistake is wanting to measure dozens of markers right away. Better to start broad with a baseline, see what stands out, and then zoom in. That way you build a picture without drowning in numbers.
That approach also fits how you train. You don't change everything at once, you adjust based on what you see. You follow your blood values the exact same way.
What don't you get from a blood test?
A blood test isn't a complete photo of your health or your form. It shows a number of values at one moment, not everything going on in your body. Some things, like a smouldering injury or your technique, simply don't show up in it.
See it as one source alongside your training data, your feel and your recovery. Together they give a richer picture than any single part, and it's that combination that makes your decisions better.
Frequently asked questions
Do you need a referral to test your blood values?
No. You request a private test yourself and the provider arranges the referral for the lab.
Which test fits my sport?
Strength athletes often look at hormones and recovery, endurance athletes at iron and inflammation. A broad start is the 360 Health panel.
How quickly do you get your data?
Usually within a few business days of the draw, depending on the markers you chose.
What does it cost?
You pay for it yourself, separate from your deductible. The price depends on which values you measure.
Does this work if you're not an elite athlete?
Definitely. Recreational athletes use their blood values to steer too. Your goal decides what's useful, not your level.
Does a blood test replace a check with the GP?
No. It gives data, not a diagnosis. With symptoms, the GP stays the right starting point.
Every blood test result at Enhanced Health includes a professional assessment from a BIG-registered doctor. For treatment decisions, always discuss your results with your GP.
References
- RIVM. Reliability of health tests. rivm.nl/gezondheidstesten/betrouwbaarheid, 2022.
- Rijksoverheid. When do I pay a deductible for my care? rijksoverheid.nl, accessed 2026.
- Zilveren Kruis. Is laboratory testing reimbursed? zilverenkruis.nl, accessed 2026.
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