Preparing for your blood test
- Precautions to be taken before your blood test
Generally speaking, we ask that you avoid physical activity for 24 hours prior to your blood test, as well as meals that are rich in sugar or fat. Eating certain foods may affect the results.
If your prescription states ‘fasting’ or ‘nil by mouth’:
The night before (nil by mouth for at least 8−12 hours):
- Stop eating
- Stop drinking alcoholic or sugary drinks
- You can, however, drink water
The day of the test:
- Do not eat breakfast
- However, you can drink water or a coffee with no sugar or milk
If you have any doubts or further questions, please do not hesitate to contact our laboratory on (+352) 488 288-1.
- When to do the test
The recommended time to do your blood test is in the morning before 10:00. That is why most of our blood collection centres are open from 06:30. In situations involving an emergency or specific cases, we are also open in the afternoon from 13:00 to 18:00. You can find the opening times for all of our blood collection centres on the Our centres page.
Certain blood parameters measured in the laboratory change throughout the day. That is why you might be asked to do the blood test in the morning or why your doctor might indicate one or more precise times of the day to do the blood test.
For certain specialist exams, you will need to make an appointment. Simply contact Ketterthill Laboratories on (+352) 488 288-1.
- Documents you need to bring
Before you set off for the laboratory, remember to bring the following:
- The prescription from your doctor
- Your CNS card and/or EHIC
Certain tests will require additional documents:
- Genetic tests: proof of consultation and prior consent
- Screening for Down’s syndrome in pregnant women: consent form completed by the doctor and signed by the patient, together with the most recent ultrasound report
If you have any doubts, please do not hesitate to contact our laboratory on (+352) 488 288-1.
- Payment and reimbursement
Tests are generally covered by the CNS (Luxembourg National Health Fund). For any tests that are not covered, you can pay directly at the blood collection centre or pay online via our website.
- Receipt of results
The majority of results are available the same evening if the blood test was done in the morning.
Certain tests may take longer, as is the case for bacteriological cultures, allergy testing or certain serological tests, for example. You will be told when to expect your results at the time of the test.
You have the following options for receiving your results:
- In person − come to the blood collection centre with your CNS card, EHIC or ID
- By post
- Via our iLab results server on your PC and/or smartphone
Discover the Laboratoire Ketterthill
For more than 70 years, Ketterthill Laboratories have been the preferred healthcare partner for medical tests in the Grand Duchy of Luxembourg. Our medical expertise combined with a cutting-edge technological platform ensures we can offer patients a comprehensive service, ranging from routine blood tests to even the most highly specialised tests.
Beyond our medical test activity, we attach great importance to human contact, making patients and their doctors the core of our focus. Through a national network of over 100 blood collection centres and locations, we offer citizens a convenient local service and provide prescribing doctors with an array of services to support them in their diagnosis and treatment of patients.
Our team of clinical biologists ensures that patients and prescribing doctors can benefit from a direct contact person, permanent support and confidential results.
Tools for patients
Nearest blood collection centre
Find the Ketterthill blood collection center nearest you.
Check your results
View and download your analysis results via
the online patient server.
Find a doctor
Are you looking for a general doctor or a specialist in Luxembourg?
You have the option to pay your bills online.