Checking your blood values during weight-loss medication: the 3-month panel
The 3-month safety and progress check clinics do: pancreas, liver, kidneys, salts and your metabolic progress on GLP-1 medication.
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Included Markers
16 markersALT (Alanine Aminotransferase), AST (Aspartate Aminotransferase), HDL Cholesterol, HbA1c (Glycated Hemoglobin), Potassium, Sodium, Glucose (Fasting), Total Cholesterol, Lipase, Creatinine, Triglycerides, eGFR (Estimated Glomerular Filtration Rate), LDL Cholesterol, Cholesterol/HDL Ratio, Non-HDL Cholesterol, LDL/HDL Ratio
Are you a few months into a weight-loss injection such as semaglutide or tirzepatide? This check lets you follow your blood values while you lose weight.
It is a compact, focused panel: not a broad baseline, but the values that may be most worth following during your weight-loss journey. You order online, need no referral, and receive your results, usually within 2 working days of the blood draw with an assessment by a BIG-registered doctor.
Why this test?
During a weight-loss journey your blood sugar, your lipid values and sometimes your liver and kidney values can change. An interim check can show how those values move along with your journey.
If you did a baseline earlier, you can compare this result against it. That way, together with a doctor, you get a picture of the change rather than a single isolated snapshot.
Who is this test for?
- People who have been using a weight-loss injection for a few months and want to check their blood values
- People who want a compact check without a broad panel
- People who did a baseline earlier and want to compare the values
- People who want to arrange this without a referral
This check does not replace care from your doctor. Always discuss your weight-loss journey and your medication with a doctor.
What is tested?
- Blood sugar: HbA1c and fasting glucose.
- Cholesterol and fats: total cholesterol, HDL and triglycerides.
- Liver: ALT and AST.
- Kidneys and minerals: creatinine, sodium and potassium.
- Pancreas: lipase.
What can this test tell you?
Your blood sugar and lipid values can place your progress in context while you lose weight. Your liver, kidney and pancreas values give a view of how those organs are doing during your journey.
It remains a snapshot, not a diagnosis. The value lies mainly in the comparison with an earlier measurement and in a conversation with a doctor.
How is the sample collected?
Blood is drawn at a certified collection point. In the Netherlands there are 650+ locations, which you choose yourself after ordering.
This is a blood test without a GP: you pick a location and a moment that suits you. The draw usually takes only a few minutes.
When is this test useful?
This check can be useful a few months after starting a weight-loss injection, or whenever you want to follow your blood values in between.
If you want a broader view and also measure nutrients such as vitamin D, B12 and ferritin, an extended check fits better with that.
What do the results mean?
Your results appear with a reference range for each marker. Values outside that range are worth discussing with a doctor, who can place them in the context of your lifestyle and weight-loss journey.
A single value outside the range does not immediately point to a problem. It is about the overall picture and the change compared with an earlier measurement.
What happens after the results?
Your results are usually in your personal dashboard within 2 working days of the blood draw, with the measured values next to the reference ranges. You view them whenever it suits you.
Every blood test result includes a professional assessment from a BIG-registered doctor. For treatment decisions, discuss your results with your GP.
Frequently Asked Questions
For reliable glucose and triglyceride values it is usually necessary to fast for 8 to 12 hours. Drinking water during that period is fine.
No. You arrange this check without a referral and choose your own collection point. You can then discuss the results with your GP.
The baseline is your starting point with a broader panel. This 3-month check is more compact and focused on interim follow-up. The extended check adds nutrients such as vitamin D, B12 and ferritin.
That varies per person. Some people choose to test periodically during their journey. Discuss with your doctor what is appropriate for you.
This test costs €109,-. The blood draw is part of it, so there are no extra draw costs; you pay yourself.
No. Blood testing you request yourself is not part of the basic Dutch insurance. You pay it yourself, and it does not come off your deductible (eigen risico).
Count on one business day, and a day extra if you order after 17:00 or at the weekend. That is how long the referral email takes, and without that referral you cannot be drawn yet. At some draw sites you then walk in without an appointment; the others work by appointment. Each location says which.
The barcode from the ZorgDomein email and a valid ID. You show the barcode on your phone; you do not need to print it. Without a BSN you get no barcode in the email, and you print the referral form from the link in the email.
Yes, take your medication as normal, unless your own doctor said something else. Some tests ask for more, such as no alcohol for 24 hours or no heavy training for 48 hours. You read that on the test and in the instructions with your order.
At the draw site you show the barcode and a valid ID. Then your blood is taken; allow about a quarter of an hour.
Yes. Every result gets an assessment from a BIG-registered doctor, with an explanation of your values in your account. Treatment you discuss with your GP.
SlimmerLab works with a network of independent, certified laboratories spread across the Netherlands. Those laboratories also manage the draw sites; SlimmerLab is not their owner. Reference values can differ slightly from laboratory to laboratory.
No. Your test does not go through your GP and does not enter your medical record. Your data goes to a healthcare provider only if you give written consent, and it is never sold. Anonymous testing is not possible: a valid result requires your name, date of birth and a valid ID.
What We Test
| No. | Biomarker | Unit |
|---|---|---|
| 01 | ALT (Alanine Aminotransferase) | u/l |
| 02 | AST (Aspartate Aminotransferase) | u/l |
| 03 | HDL Cholesterol | mmol/l |
| 04 | HbA1c (Glycated Hemoglobin) | mmol/mol |
| 05 | Potassium | mmol/l |
| 06 | Sodium | mmol/l |
| 07 | Glucose (Fasting) | mmol/l |
| 08 | Total Cholesterol | mmol/l |
| 09 | Lipase | u/l |
| 10 | Creatinine | umol/l |
| 11 | Triglycerides | mmol/l |
| 12 | eGFR (Estimated Glomerular Filtration Rate) | ml/min/1,73m² |
| 13 | LDL Cholesterol | mmol/l |
| 14 | Cholesterol/HDL Ratio | mol/mol |
| 15 | Non-HDL Cholesterol | mmol/l |
| 16 | LDL/HDL Ratio | ratio |
| Your results are usually in your SlimmerLab account within 2 working days of the blood draw. The laboratory states a longer turnaround for Lipase. | ||
Preparation
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No hard training beforehand
RequiredNo heavy training, long endurance sessions or anything that leaves you out of breath in the 48 hours before the draw. Normal walking is fine.
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No alcohol beforehand
RequiredDrink no alcohol in the 24 hours before the draw.
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Come fasting
RequiredFrom 22:00 the evening before, eat and drink nothing except water. That is at least 8 hours. Skip coffee, tea, chewing gum and smoking that morning. Plan the draw before 10:00.
- Water is always fine. Drink as usual beforehand, it makes the draw easier.
- Take your usual medication, unless your own doctor told you otherwise.
Extend this panel
Same draw, no second appointment.
Related Measurements
Insulin Resistance (HOMA-IR)
Insulin resistance becomes more relevant with age. Track it with fasting glucose, insulin and your HOMA-IR score.
GLP-1 Baseline Panel
Your starting point before the first injection: blood sugar, cholesterol, pancreas, liver, kidneys, thyroid and nutrients in one measurement.
GLP-1 Extended Panel
The 6-month measurement: everything from the check-in plus insulin, ApoB and your nutrients — especially relevant if you have been eating much less for a while.