Thyroid
Thyroid function
A focused thyroid function test with TSH and Free T4, for insight into energy, weight and metabolism. Want Free T3 and TPO antibodies too? Choose the extended variant.
Thyroid function is a blood test measuring 2 biomarkers, reviewed by a doctor. Below you see exactly what is measured and what those results tell you.
Personal assessment by our BIG-registered doctors
Choose your measurement
Thyroid function
With this test, another €156 and your blood draw fee is waived
Next step: choose your blood draw location
Composition
What exactly is measured
All 2 biomarkers at a glance. The laboratory's reference values always lead.
Thyroid function69,-
- TSH
- Free T4
How Bloodworks works
Order online
Choose your package and preferred location
Receive your lab form
Within 24 hours by email, with appointment planner
Schedule your blood draw
Or choose a walk-in location
Blood draw
Takes just a few minutes
Receive your report
Securely, typically within 2 working days from our physicians
Included
Your personal health dashboard
Sample view · fictitious data.
Within range
of the biomarkers within the lab reference
Latest measurement: 1 Jul 2026
Needs attention
Your development
Vitamine D3
- All your results in one secure place
- See your development with every new measurement
- Compare against your own earlier values
Included
Your laboratory report
Every abnormality is given context and advice by a doctor. Reference values always come from the laboratory.
Client
Reference
Collection date
06-05-2025
Report date
08-05-2025
2 abnormalities found
Magnesium & vitamin D too low, see explanation
Vitamins & Minerals
Doctor comment
Your magnesium and vitamin D are markedly reduced. This can contribute to fatigue, muscle cramps and lower immunity. Supplements are generally available over the counter in the Netherlands. At your levels, however, we advise read more ›
Clinical labs
ISO 15189-accredited laboratories
Venepuncture
Full venous draw, as in a hospital
Our own doctors
Every result reviewed and interpreted
Your trend
Every value over time in your dashboard
Experiences
What customers say
Vanuit de sportschool geattendeerd op Bloodworks en heel tevreden. Bloedonderzoek online besteld en kon direct terecht bij een lab in de buurt. Kreeg het labformulier per e-mail en…Ik heb eerder onderzoeken laten uitvoeren door andere organisaties, maar Bloodworks steekt daar met afstand bovenuit. De snelle service, het persoonlijke contact en de…Na geregeld duizelig te voelen ben ik langs geweest bij Bloodworks voor een bloedtest, snelle service en super snel uitslag gekregen! Advies gekregen van de specialisten om een…FAQ
Frequently asked questions
Do I need to fast?
Fasting is not required for TSH and Free T4. We do recommend taking the sample at a calm time of day.
What is the difference between TSH and Free T4?
TSH is the hormone from the pituitary gland that stimulates the thyroid. Free T4 is the thyroid hormone itself in its active form. The combination gives the most complete picture.
What if I take thyroid medication?
Thyroid medication affects TSH and T4. Please let us know so we can adjust the interpretation accordingly.
What if I want more specific markers?
Through Bloodworks Select you can add markers such as Free T3, TPO antibodies or TG antibodies.
How quickly do I receive my results?
Typically typically within 2 working days of blood draw.
Ready to gain insight?
Thyroid function · 2 biomarkers · results typically within 2 working days