Extended blood test for weight loss: your broader check with nutrients
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.
Add to your order
No referral needed
Added to your order
Click the button to view your cart
Included Markers
23 markersInsulin (Fasting), ALT (Alanine Aminotransferase), AST (Aspartate Aminotransferase), HDL Cholesterol, HbA1c (Glycated Hemoglobin), ApoB (Apolipoprotein B), Vitamin B12, Ferritin, Potassium, Sodium, Glucose (Fasting), Total Cholesterol, Albumin, Lipase, Creatinine, Vitamin D (25-OH), Triglycerides, HOMA-IR, eGFR (Estimated Glomerular Filtration Rate), LDL Cholesterol, Cholesterol/HDL Ratio, Non-HDL Cholesterol, LDL/HDL Ratio
Have you been using a weight-loss injection for a longer period and want a broader check? This extended blood test for weight loss looks not only at your blood sugar, cholesterol, liver and kidneys, but also at a number of nutrients.
Those who eat much less for a longer time in particular may benefit from insight into vitamin D, vitamin B12 and ferritin (your iron stores). 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?
After losing weight for a longer time while eating less, your nutrients can change alongside your metabolism. An extended check maps both: your metabolic values and a number of vitamins and minerals.
That way you get a broader picture at a later point in your journey, which you can discuss with a doctor.
Who is this test for?
- People who have been using a weight-loss injection for a longer time and want a broader check
- People who want to measure vitamins and iron alongside their metabolic values
- People who want to follow or rule out a nutrient deficiency during a weight-loss injection
- People who want to arrange this without a referral
This check does not replace medical advice. Discuss your journey and any deficiencies with a doctor.
What is tested?
- Blood sugar and insulin: HbA1c, fasting glucose and fasting insulin.
- Cholesterol and fats: total cholesterol, HDL, triglycerides and ApoB.
- Liver: ALT, AST and albumin.
- Kidneys and minerals: creatinine, sodium and potassium.
- Pancreas: lipase.
- Nutrients: vitamin D, vitamin B12 and ferritin.
What can this test tell you?
Your blood sugar, insulin and lipid values can place your metabolism and progress in context. Your liver and kidney values give a view of those organs at this point in your journey.
Because eating less for a long time can affect your nutrients, insight into vitamin D, vitamin B12 and ferritin may be relevant. Together these remain a snapshot, not a diagnosis.
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 extended check can be useful further into your journey, for example after several months, or whenever you want to measure your nutrients alongside your metabolic values.
If you prefer a more compact interim check, a shorter panel may fit better. Some people alternate a broad and a compact measurement during their journey.
What do the results mean?
Your results appear with a reference range for each marker. Values outside that range, including for vitamins, are worth discussing with a doctor, who can place them in context.
A single value outside the range does not immediately point to a problem. It is about the overall picture and the change over time.
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, insulin 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.
This check measures vitamin D, vitamin B12 and ferritin (a measure of your iron stores), among others. During prolonged reduced food intake in particular, these values can be relevant to follow.
The baseline is your starting point before you begin. The 3-month check is a compact interim panel. This extended check adds nutrients and insulin for a broader picture later in your journey.
This test costs €196,-. 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 | Insulin (Fasting) | pmol/L |
| 02 | ALT (Alanine Aminotransferase) | u/l |
| 03 | AST (Aspartate Aminotransferase) | u/l |
| 04 | HDL Cholesterol | mmol/l |
| 05 | HbA1c (Glycated Hemoglobin) | mmol/mol |
| 06 | ApoB (Apolipoprotein B) | g/l |
| 07 | Vitamin B12 | pmol/l |
| 08 | Ferritin | ug/l |
| 09 | Potassium | mmol/l |
| 10 | Sodium | mmol/l |
| 11 | Glucose (Fasting) | mmol/l |
| 12 | Total Cholesterol | mmol/l |
| 13 | Albumin | g/l |
| 14 | Lipase | u/l |
| 15 | Creatinine | umol/l |
| 16 | Vitamin D (25-OH) | nmol/l |
| 17 | Triglycerides | mmol/l |
| 18 | HOMA-IR | Index |
| 19 | eGFR (Estimated Glomerular Filtration Rate) | ml/min/1,73m² |
| 20 | LDL Cholesterol | mmol/l |
| 21 | Cholesterol/HDL Ratio | mol/mol |
| 22 | Non-HDL Cholesterol | mmol/l |
| 23 | 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 ApoB (Apolipoprotein B), Insulin (Fasting), Lipase, Vitamin B12 and Vitamin D (25-OH). | ||
Preparation
-
Been ill? Wait a little
RequiredHad a fever, an infection or a vaccination in the past 2 weeks? Wait with the draw until you are fully recovered. These values react to inflammation and would give a distorted picture.
-
Pause biotin
RequiredDo you take a supplement with biotin (vitamin B8, common in hair, skin and nail supplements)? Stop it 72 hours before the draw. Biotin interferes with the measurement of these values.
-
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.
-
No alcohol beforehand
RequiredDrink no alcohol in the 24 hours before the draw.
-
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 Check-in Panel
The 3-month safety and progress check clinics do: pancreas, liver, kidneys, salts and your metabolic progress on GLP-1 medication.