Frequently asked questions

Test & Results

You will receive your result (positive or negative) via SMS on your mobile phone after 48 - 72 hours. You can then download your results in PDF format from the homepage with your access data (Matricule and SMS code).
The patient receives his result and the report is also sent to the "Inspection sanitaire".
A positive SARS-CoV-2 PCR test (with or without symptoms) means you have a recent SARS-CoV-2 infection, i.e. the virus has been detected in your body.
In the event of a positive test - with or without symptoms - those affected must be placed in home quarantine or receive medical care. Tracing and testing of contact persons will be carried out.
No current SARS-CoV-2 infection was detected. If a negative test is found, the restrictions (e.g. quarantine if applicable) can be lifted and the affected person can return to work or school. The general protective measures such as social distancing, hand washing and compulsory masks continue to apply.
COVID-19 detection by PCR is performed using an oropharyngeal swab. (or nasopharyngeal swab if the oropharyngeal swab is not possible)
No. The nasal or throat swab does not hurt, but it can be unpleasant, but it is very short.
If you have received an invitation from the Luxembourg government, you can make an appointment at one of the test stations on the website You will need the access code that you received with your letter of invitation and your social security number. With this voucher (confirmation of the appointment) you can have the PCR throat swab taken.

The composition of the quotas that receive an invitation and the testing time frame is determined by the government.
"However, the COVID-19 Task Force recommends that the following aspects, among others, should be considered when deciding on prioritization: age structure and number of people in the sector; working conditions (is physical distancing possible at the workplace, is home office possible, etc.); economic influence of the sector".
  • Serological tests allow a clear identification of those patients (with or without symptoms) who have already developed an immune response to the SARS CoV-2 virus. Antibodies are detected with a blood sample (serum). As a rule, IgM and/or IgG antibodies are not detectable until the second week after the onset of symptoms in (symptomatic) patients.
  • For the reliable detection of an acute infection with SARS-CoV-2, a single method, also recommended by the WHO, can be used:
    This method is based on the detection of nucleic acids by polymerase chain reaction, i.e. the PCR test. (smear test)
A Ct value > 34 probably excludes contagiosness under the following conditions:
  • no more clinical symptoms are present
  • there has been no recent contact with a COVID-19 PCR positive person
  • the sampling has been performed correctly
  • and/or if the patient was tested PCR positive more than 10 days ago.

Please note that a low viral load may also be present in the early stage of infection before any clinical symptom is apparent!

Ct values should therefore be interpreted with caution and only by the physician who can confront the PCR results with anamnesis, clinical findings, previous PCR results (if available) and other lab test results.

The analytical techniques of RT-PCR gives a numerical result called Ct (cycle threshold), which approximately estimates the viral load (the Ct being theoretically inversely proportional to the viral load).

A Ct value above 37 is considered as negative result.


The Luxembourg government is embarking on a new phase of screening with the aim to test representative samples of the population in order to monitor developments and to be as flexible as possible in the event of an increase in the number of cases. This is the best way to break infection chains and effectively trace the contacts of infected people.

The COVID-19 test at the invitation of the Luxembourg Government concerns residents and cross-border workers. It is free of charge.

If you present symptoms potentially related to COVID-19, directly consult your doctor for a test on medical prescription.

The strategy and the process ofLST 2
Appointments can be made by invitation only with a one-time use code valid for 2 weeks, according to this distribution:
  • Continuous sampling tests of the population
  • Tests of particularly exposed individuals
  • Tests of incoming travellers
  • Reactive tests
  • Serological tests
The PCR tests are carried out by oral sampling only, the serological tests by blood sample.
These mass tests are important to prevent a second wave of infection after the end of the lockdown.
"For a successful relaxation of the measures it is crucial to identify the asymptomatic virus carriers so that the chain of infection can be interrupted", says Professor Ulf Nehrbass, spokesman of the COVID-19 Task Force of Research Luxembourg. "This can only be achieved through large-scale testing. This means that the aim of the whole project is not just to tell a person whether they are positive or not, but primarily to identify healthy carriers. (people who are carriers of the virus but asymptomatic). This is an important step in preventing a second wave an avoid another lockdown".
The project was developed by the Task Force COVID-19 of Research Luxembourg and is led by the Luxembourg Institute of Health. The tests are carried out by Laboratoires Réunis, which is logistically supported by Ecolog.
The Luxembourg Government sends letters of invitation to persons who have been previously identified in the contingent to be tested.
Yes, the test is free of charge for all those who have received an invitation letter from the Luxembourg government with the voucher necessary for the PCR -COVID-19 test.
Every day, tens of thousands of residents and border residents will be able to carry out a voluntary screening test for the SARS-CoV-2 coronavirus and will receive a letter of invitation from the Luxembourg government in advance.

The Luxembourg population, including border residents, will be divided into contingents of 50,000 to 100,000 people. Each contingent will be tested individually for the SARS-CoV-2 virus over the next few months, in phases and at different locations. This PCR test (oropharyngeal swab) is voluntary.
The aim is to effectively monitor the spread of the virus using statistical analyses and other methods in order to be able to adapt the measures to the situation and keep the virus under control at all times and thus be able to lift the lockdown as quickly and safely as possible. Prof. Dr. Ulf Nehrbass, Director of the "Luxembourg Institute of Health" (LIH) and spokesperson of the Task Force COVID-19 Research Luxembourg, explained that there might be a high number of people infected with the coronavirus but without symptoms. From the transition to a relaxation of the measures adopted, "it is precisely this number of asymptomatically positive patients that "becomes very relevant" - even if the chains of infection are now almost linear, i.e. no longer exponential.
Antibody tests indicate whether a person has already had the virus and may be immune. This is of personal interest. If it turns out to be certain that you are immune once you have had the virus, it would be interesting for the individual to know. However, this does not play an important role for public health at this stage. According to the CON-VINCE study, in which a representative group of the population was tested for antibodies, only about 2% of the population have currently developed antibodies against the SARS-CoV-2 virus (this is also called 'seropositive'). We are therefore still a long way from herd immunity, which would only be reached at around 60%. If we were to carry out large-scale antibody tests now, we would only get very, very many negative results, wasting a large amount of resources. Large-scale antibody testing only makes sense when about 30% of the population has already been in contact with the virus. Only when any immunity is widespread in the population does this have a significant effect on the spread of the virus and thus on public health.

PCR tests do, however, have a public health effect, because they make it possible to identify those who are currently infected and who can infect others, so that they can then send them home to stop infecting other people. So they prevent new infections. And the aim of this phase of lifting the initial restrictions is to reduce the number of new infections to a minimum.


Those who have received an invitation from the Luxembourg government can have the COVID test (oropharyngeal swab) done there with their voucher.

Yes, cross-border commuters are also to be tested for the coronavirus SARS-CoV-2 and will receive an invitation from the Luxembourg government in advance.

How: The population and cross-border commuters will be divided into contingents of 50,000 - 100,000 people. Each contingent will be individually tested for the coronavirus SARS-CoV-2 (in phases and at different locations) over the next few months. This PCR test (oropharyngeal swab) is voluntary.
The Luxembourg government will write to the residents according to "contingents".

How: The population and cross-border commuters will be divided into contingents of 50,000 - 100,000 people. Each contingent will be individually tested for the coronavirus SARS-CoV-2 (in phases and at different locations) over the next few months. This PCR test (oropharyngeal swab) is voluntary.
If the members of your family have not received an invitation/voucher from the Luxembourg government, they cannot be tested together with you. The composition of the quota and the time frame of the test are defined by the government.


PCR-oropharyngeal swab on INVITATION is only possible in the "ECOLOG Drive-In" stations across the country. Addresses and opening hours can be found here.


Yes, you can set an appointment on the online platform ( after receiving your invitation from the government (i.e. choose the time and location of the drive-in station that suits you best).
Yes, it is important to keep your appointment to avoid long waiting times.
You will receive your result (positive or negative) via SMS on your mobile phone after 48 - 72 hours. You can then download your results in PDF format from the homepage with your access data (Matricule and SMS code).
You will need:
  • your appointment confirmation you received on,
  • your CNS card with your “matricule”
  • and your identity card.
No, it is not necessary to fast for the oro or nasopharyngeal swab.
You will receive your result, whether positive or negative, directly to your mobile phone. You can download the PDF of the result here.
Detection is by the PCR test procedure using an oropharyngeal swab (or nasopharyngeal swab if the oropharyngeal swab is not possible).