Protein Test

  • cerascreen - Protein Test for protein intolerances
  • Cerascreen - Home blood test for protein intolerance
  • Protein Test

Protein Test

Screen for intolerances to 16 different proteins

Protein intolerances put a great strain on your body. They can trigger unpleasant symptoms such as abdominal pain, diarrhoea and nausea, as well as fatigue and reduced physical and mental performance. Proteins that you cannot tolerate can therefore make it difficult for you to improve your athletic performance and achieve your goals.

Do not leave your protein intake to chance! Find out which proteins you tolerate with the cerascreen® Protein Test – and optimise your protein intake to boost your performance in sports and everyday life. The test is a send-in sample kit you can take at home. Using a small blood sample, our laboratory determines whether your body reacts with antibodies to 16 common proteins from food, including nine animal sources and seven plant-based protein sources.

  • Take your sample at home – conveniently and discreetly
  • Benefit from a state-of-the-art sample analysis from a specialised medical laboratory
  • Have your sample screened for IgG4 antibodies against 16 different proteins from food
  • Avoid doctor’s appointments and waiting times
  • Receive personal recommendations for optimal protein intake and muscle growth
  • Receive results within a few days after the lab has received the sample

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Information about the Protein Test

Benefits of the Protein Test

An optimal protein intake is a crucial topic for athletes, but also for people who follow a plant-based diet and want to get the most out of vegan protein sources. But regardless of whether you belong to one of these social groups, you could certainly find it interesting to check which proteins you tolerate best.

Because it is not only the composition of amino acids and their bioavailability – that is, how well your body absorbs the protein – that counts. Finding out which proteins you can tolerate is also vital if you want to reduce discomfort, increase your everyday well-being and optimise your athletic performance.

Benefit from our expertise: cerascreen® is the market leader for medical send-in test kits in Europe, with eight years of experience in test development and analysis. We have developed more than 50 approved send-in test kits (medical devices), analysed 250,000 samples and serve 19 countries in Europe – and we have now also launched in the United States!

Which protein intolerances does the Protein Test screen for?

The cerascreen® Protein Test examines your blood sample for the concentration of specific IgG4 antibodies against 16 different protein sources, including nine animal proteins and seven plant-based proteins.

Table: List of foods against which IgG4 antibodies are measured

Animal proteins
Plant-based proteins
Chicken egg
Cow’s milk (whey) Wheat (gluten)
Cow’s milk (casein)
Goat’s milk (whey, casein)
Sheep’s milk (whey, casein)
Soya beans
Sweet lupine


Your results report

As soon as your sample has been analysed, you will receive your results report via the My cerascreen® app or your user account on our website. You can easily view the report on your smartphone, tablet or computer and print it out, if required.

Find out the concentration of specific IgG4 antibodies against certain proteins in your blood in our laboratory analysis. Learn, with the help of our recommendations for action, how to further investigate intolerances and still maintain a balanced diet. Our extensive health information introduces you to the different proteins – along with their properties and benefits.


FAQs about the Protein Test

  • Why take the Protein Test?

    An optimal protein intake is an important topic for athletes, but also for vegans who want to get the most out of plant-based protein sources. But for everyone else, too, looking closely at which proteins your body best tolerates can be very insightful.

    Because it is not only the composition of amino acids and their bioavailability – that is, how well the protein is absorbed by our body, that counts. Finding out which proteins you can tolerate is also crucial if you want to reduce discomfort, increase your well-being and get the most out of your athletic performance.

    The Protein Test gives you insights into these important topics and helps you to choose the protein sources that are suitable for you. You will also receive detailed information and tips about the various proteins.

    Please note: The Protein Test will not tell you whether you are intolerant to other substances, such as lactose or gluten. Other tests need to be carried out to detect these intolerances. Lactose intolerance, for example, is an intolerance to lactose, whereas the Protein Test examines screens for intolerances to whey proteins and caseins in milk.

  • How does the Protein Test work?

    To carry out the Protein Test, take a small blood sample from your fingertip with a lancet. Only a few drops of blood are needed.

    Send your sample in the sample tube provided via a return envelope to our specialist laboratory, which analyses the number of certain IgG4 antibodies in your blood. After the analysis, you will receive a notification, after which you will be able to access your results report by logging in on our website or on the My cerascreen® app.

    Please note: You will get the most meaningful results if you have maintained a varied diet and have not abstained from any of the tested proteins in the two weeks prior to collecting the sample.

  • What will the results tell me?

    Our Protein Test results report shows you which IgG4 antibodies were detected in your blood – that is, to which foods you react.

    A table will show you whether the antibody concentration for each of the 16 different proteins in your blood was low (green), medium (yellow) or high (red). This gives you an indication of whether you might be intolerant to a protein. High IgG4 values are not a concrete diagnosis. Only doctors can officially diagnose you with an intolerance – you should consider also you talking to your doctor about the results from this test.

    However, observations in practice show that increased IgG4 values are often accompanied by symptoms of an intolerance. However, sometimes, high values are not accompanied by any complaints at all.

  • Which recommendations will I receive?

    In the results report, we will tell you which proteins are well tolerated by you based on our lab analysis. You will also receive tips on how you can further investigate how to manage eliminating or reducing the proteins to which you are intolerant over the long term.

    We will also inform you in detail about different proteins and how you can provide your body with the all-important amino acids. In addition, you will receive valuable tips for muscle growth. This makes it easier for you to find the diet that suits you and helps you achieve your goals.

  • Why are proteins so important?

    Proteins are broken down into their amino acids in our bodies and are reassembled into new proteins. They are the building blocks of many important hormones; they also work as enzymes and antibodies and transport nutrients and oxygen through our blood.

    In addition, proteins are involved in building and repairing muscles. That is why people who do very intensive sports have higher protein requirements – their body uses up more protein.

  • How can the right proteins boost your workout?

    If you have a higher daily protein requirement, protein powders and drinks can help you meet these. This ensures that your body has the right building blocks to effectively build and maintain muscle after training. However, it is of course crucial that you tolerate the proteins well!

    Intolerances might not only distract you from an effective workout if you’re suffering from gastrointestinal complaints, but they also cause fatigue and reduce your performance.

  • Which proteins does the test screen for?

    The protein test analyses the IgG4 antibodies against a total of 16 protein sources.

    Animal proteins:
    - Chicken egg
    - Whey (cow’s milk)
    - Casein (cow’s milk)
    - Goat’s milk (whey, casein)
    - Sheep’s milk (whey, casein)
    - Chicken meat
    - Pork
    - Beef
    - Tuna

    Plant-based proteins:
    - Pea
    - Wheat (gluten)
    - Rice
    - Hemp
    - Soya bean
    - Sweet lupine
    - Sunflower

  • What are IgG4 antibodies?

    For the Protein Test, specific IgG4 antibodies are measured in your blood. The abbreviation ‘IgG4’ stands for immunoglobulins G4.

    Immunoglobulins are important building blocks of our immune system. There are different classes of immunoglobulins – for example, immunoglobulin E (IgE) and immunoglobulin G (IgG). The IgG4 antibodies can block IgE antibodies, which the body uses, for example, to reduce allergic reactions.

    IgG4 are specific antibodies – this means that a very specific type of antibody is produced against a very specific protein. So, for example, there are IgG4 antibodies against chicken egg proteins that are different from IgG4 antibodies against soy proteins. Specialist laboratories can precisely analyse these specific antibodies in our blood.

  • What are IgG4-mediated intolerances?

    According to theories, an increased number of specific IgG4 antibodies can lead to defensive reactions and inflammation in the body when you eat certain foods.

    Symptoms can show up with a delayed reaction – for example, the affected person might eat a certain food to which they are intolerant, but symptoms may not appear until hours or even days later.

  • Which symptoms are associated with a food intolerance?

    Possible symptoms of IgG4-mediated intolerance are:
    - gastrointestinal complaints, especially flatulence
    - headaches and migraines
    - fatigue
    - wheezing and a runny nose
    - skin rashes

    In addition, some experts suspect that intolerances may contribute to the development of inflammatory bowel diseases.

  • Who should NOT take the test?

    The Protein Test is not or only partially suitable for certain groups of people:
    - People with infectious diseases, like hepatitis and HIV, may not use the Protein Test.
    - Pregnant and breastfeeding women should only take the Protein Test under medical supervision. The given reference ranges and recommendations do not apply to people in this group; consult your medical professional for advice concerning your test results.
    - The Protein Test is not intended for children under 18 years of age.

    The test is not intended for diagnosing illnesses or diseases. For example, if you suffer from moderate depression or extreme pain, consult a doctor.


YouTube partner

Rohe Energie’

We (Alexandra and Lars) have been dealing extensively with health and the optimisation of the quality of life through nutrition since 2005. Only through regular monitoring can we stay on the home stretch to growing old healthily and happily.’

Sports partner

FC St. Pauli

In performance diagnostics, we have a duty to support our players individually. The tests and results from cerascreen® offer us great added value in the further development of our talented players.’ (Björn Benke, head of the club’s youth academy)

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