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BloedCheckup
  • Tests
    • Test packages
    • Hormones
    • Cardiovascular
    • Thyroid
    • Vitamins
    • STD test guide
    • Custom test request
    View all tests
  • At-home tests
    • Fingerstick
    • Urine
    • Stool
    • Saliva
    • Hair
    • Swab
    View all at-home tests
  • How it works
    • How it works
    • Locations
    • Laboratories
    • Fasting guidance
    • Shipping
    • Blog
  • About us
    • About us
    • Client reviews
    • For business
  • Contact
    • FAQ
    • Contact us
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BloedCheckup

Professional blood tests without GP referral. Partnership with ISO certified laboratories for reliable results.

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Post-COVID Syndrome Extensive

Blood count, CK, LD, leukocytes, magnesium, liver, and albumin. Extensive analysis for prolonged post-COVID symptoms.

€125.00
  • No GP referral needed

Blood collection at collection point

How it works

  1. 01

    Order your test

    After your order you receive instructions by email

  2. 02

    Schedule your appointment

    Make an appointment at a collection point near you

  3. 03

    Visit the collection point

    Blood collection at 1,000+ locations across the Netherlands

  4. 04

    Receive your result

    Digitally by email once the analysis is complete.

Blood collection at collection point

How it works

  1. 01

    Order your test

    After your order you receive instructions by email

  2. 02

    Schedule your appointment

    Make an appointment at a collection point near you

  3. 03

    Visit the collection point

    Blood collection at 1,000+ locations across the Netherlands

  4. 04

    Receive your result

    Digitally by email once the analysis is complete.

What is Post-COVID Syndrome Extensive?

The Post-COVID Syndrome Extensive blood test is a comprehensive analysis for individuals with prolonged symptoms after COVID-19. This test goes beyond the basic package and adds important markers for muscle condition, heart function, muscle breakdown, and nutritional status. Besides the lungs, COVID-19 can also affect the heart, muscles, and metabolism. This extensive analysis helps to determine which organ systems are affected and what causes persistent symptoms such as extreme fatigue, muscle weakness, pulmonary complaints, and malnutrition.

What is tested?

  • Hemoglobin (Hb) – Oxygen-transporting protein
  • MCV – Mean corpuscular volume of red blood cells
  • Iron – Available iron
  • ESR – Erythrocyte sedimentation rate, inflammation marker
  • Creatinine – Kidney function
  • eGFR – Estimated kidney function
  • CK (creatine kinase) – Marker for muscle breakdown
  • LD (lactate dehydrogenase) – Enzyme for tissue damage
  • Leukocytes – White blood cells (immune system)
  • Magnesium – For muscle and nerve function
  • ALT (liver) – Liver enzyme
  • Albumin (nutritional status) – Protein for nutritional status

Why should you get Post-COVID Syndrome Extensive tested?

This extensive test is suitable for individuals with severe or prolonged post-COVID symptoms. CK (creatine kinase) measures active muscle breakdown that can occur after COVID. LD (lactate dehydrogenase) is elevated with damage to the lungs, heart, or other tissues. Leukocytes check the immune system. Magnesium is crucial for muscle and heart function and is often low after COVID. ALT checks the liver, which can be affected. Albumin measures nutritional status, which is often poor after severe COVID. This test provides a more complete picture of the systemic effects of COVID on your body.

What does it indicate?

The results show which organ systems have been affected by COVID. This extensive test measures:

  • Muscle breakdown – CK (creatine kinase) for active muscle breakdown
  • Tissue damage – LD (lactate dehydrogenase) for lung, heart, or liver damage
  • Immune system – Leukocyte status
  • Muscle and heart function – Magnesium for cramps and heart problems
  • Liver function – ALT for liver inflammation
  • Nutritional status – Albumin for malnutrition or inflammation

These markers help determine which organs require attention and explain why recovery is so difficult.

What does a high level mean?

Elevated CK indicates active muscle breakdown due to COVID and requires rest and recovery. Elevated LD may indicate lung damage, heart damage, or liver damage after COVID. Elevated ESR means persistent inflammation. High leukocytes can indicate secondary infections or immune activation. Elevated ALT indicates liver inflammation that sometimes occurs after COVID. Elevated creatinine means kidney problems. These abnormalities require medical evaluation and targeted management to promote recovery.

What does a low level mean?

Low hemoglobin and iron cause extreme fatigue and should be addressed. Low leukocytes can indicate a weakened immune system after COVID. Low magnesium is very common after COVID and causes muscle cramps, heart problems, and fatigue. Low albumin indicates malnutrition or chronic inflammation and requires nutritional support. Low MCV indicates iron deficiency anemia. These deficiencies explain many post-COVID symptoms and are, fortunately, manageable with supplements, nutrition, and rest. Correcting these values often leads to significant improvement in condition and well-being.

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See how it works

Frequently asked questions

Answers to what people usually want to know.

How does it work from order to result?

After ordering we generate a referral letter and email you the instructions. You pick a collection point yourself and book an appointment there. Blood is drawn at the location, processed at the lab, and your result arrives digitally.

How quickly can I get tested?

Often within a few working days. How soon you can be seen depends on how busy the location is and the type of analysis. For specialist analyses we first ship collection materials, which takes a bit longer.

Do I need to book an appointment?

At most collection points yes. Some accept walk-ins. This is clearly indicated per location. You choose the location that works best for you.

Do I need to fast before the test?

That depends on the test. Whether fasting is required, and from what time, is clearly stated in the instructions you receive after ordering. No surprises at the counter.

When and how do I receive my result?

It varies per analysis: from same-day to a few working days. Standard values often come back quickly; analyses that go to an external lab can take a bit longer. You get an email with a link to your digital result, including a short explanation per value.

Where can I go for collection?

We work with 1,000+ collection points across the Netherlands. After ordering you'll see which locations near you are available and you pick where you'd like to go.

Didn't find what you're looking for?

Need help?

We're here for you. Send a message and we'll respond as soon as we can.

WhatsAppWhatsApp+31 412 236 961E-mailinfo@bloedcheckup.nl

Weekdays 09:00 – 17:00 · Outside hours we reply a bit later

Client experiences

This is why clients choose us

88% recommend usBased on 165 verified Trustpilot reviews

“Hele fijne en snelle service”

Hele fijne en snelle service! Ik contacteerde ze ‘s nachts omdat ik zsm moest bloedprikken, ik kon die ochtend nog terecht en heb dezelfde dag mijn uitslag binnengekregen. Echt top!!

Madina ShinwariVerified

“Bloedcheckup levert”

Waar ziekenhuizen moeilijk doen om checkup te doen , komt Bloedcheckup naar boven drijven als vertrouwde partner op gebied van gezondheid. Ik ben uiterst tevreden met bloed checkup

JoaquinVerified

“Klantenservice was erg behulpzaam in…”

Klantenservice was erg behulpzaam in het beantwoorden van mijn vragen. Ik had ook een extra setje buizen nodig als back-up en dat was geen probleem. Ik had een groot test panel besteld, maar de resultaten waren binnen 1 week binnen. Rapport zag er netjes uit.

ErnstVerified

“Snelle en goede service”

Je hebt de spullen snel in huis en het is duidelijk wat je daarna moet doen. Ook de uitslag heb je snel in huis, ik dezelfde avond al de eerste uitslagen. Bij een bepaling ging het fout, niet eens door het bedrijf maar door het bloedafname punt en die bepaling kreeg ik gewoon vergoed, ook het geld terug stond erg snel op mijn rekening. Vragen worden ook snel beantwoord dus al met al een positieve ervaring bij Bloedcheckup.nl

AnoniemVerified

“Fijn bedrijf met geweldig veel opties…”

Fijn bedrijf met geweldig veel opties om zelfstandig je gezondheid in het oog te houden, als sporter een must want de dokters hebben toch geen verstand van wat relevant en anders is voor sport. Ook zeer tevreden over Stijn zelf! Aangename kerel en goed bereikbaar voor vragen en hulp tijdens bestellen :D

MyronVerified

“My experience was very positive”

My experience was very positive. I needed to pass several very specific tests. They provide 24/7 customer support. They were friendly and prompt.

Olesia TaldykinaVerified

“Top!”

Snelle en makkelijke afhandeling. Duidelijke instructies en binnen anderhalve dag al resultaat binnen. Top service!

ZerinaVerified

“Amazing service!”

Received a packet with everything needed, went to a walk in clinic (Amsterdam DC Clinic) where my blood was drawn and I was out the door within 5 minutes, and then after posting the samples, received results 2 days later. Results were easy to understand as well. Amazing service, would highly recommend!

Trudi CoetzeeVerified
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Indication-specific evidence

This test has clinical value for specific complaints or indications, but is not intended as screening without symptoms.

Rationale for this test

Deze test combineert standaard bloedonderzoek met markers die klinisch relevant kunnen zijn bij langdurige klachten na COVID-19. De Nederlandse richtlijn voor langdurige klachten na COVID-19 (NHG/FMS) beveelt laboratoriumonderzoek aan op indicatie, maar schrijft geen specifiek testpakket voor. De meeste markers in dit pakket (bloedbeeld, nierfunctie, leverfunctie) zijn gevestigde diagnostische tests, maar hun specifieke waarde als screeningspakket voor post-COVID is niet vastgesteld in richtlijnen. De test is geschikt voor gerichte diagnostiek bij specifieke klachten, maar niet als standaard-screening zonder klinische indicatie.

Last reviewed on April 22, 2026

Sources consulted

Dutch clinical guidelines and healthcare organisations

  • Startpagina - Langdurige klachten en revalidatie na COVID-19
See how it works
  • [PDF] Verkenning naar het zorggebruik bij postinfectieuze klachten - Nivel
  • Independent information sources

    We recommend consulting these independent sources before ordering a preventive health check.

    • Client brochure PGO (NVvPG, September 2023)

      Brochure on preventive health checks: careful choice, reliability, pros and cons, checklist.

    • RIVM — Health tests

      Independent information about preventive health checks from the National Institute for Public Health and the Environment.

    • Thuisarts.nl

      Reliable patient information about illnesses and complaints from Dutch GPs (NHG).

    • Allesovertesten.nl (NVKC)

      Public-facing website of the Dutch Society for Clinical Chemistry with explanations of blood tests and laboratory values.

    View all questions
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    Collection points1,000+ across the Netherlands