Questions and Answers COVID tests

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Below, we answer the most frequently asked questions that we receive each week for COVID testing at our clinic in Paseo del General Martínez Campos, 46 in Madrid, just 15 minutes from the airport.


The current prices of the different tests are: RT-PCR test €110 (with same day results) and urgent RT-PCR test for €199 (with results from 3-4 hours); rapid antigen test, €50 (with results in 15 minutes); complete ELISA test, €55, and Post Vaccine and Post COVID ELISA IgG test, €35; quick antibody test for €25. We offer a discount of €10 when two tests are combined and we also offer discounts for purchases from €221.
For all RT-PCR tests yes, as long as you make an appointment before 4 p.m., including weekends. For tests performed between 4 p.m. and 7 p.m. Monday to Friday, results are delivered the following day from 11 a.m. The results of antigen and antibody rapid tests are delivered within 15 minutes and ELISA tests and COVID Cellular Immune Test on Fridays from 8 p.m.
Yes, you have to register your data in our COVID appointment platform ( and you will be able to order all the tests you need for yourself or for your family and friends.
Exceptionally we can give appointments at the clinic to people who have had technical problems on the website, either registering or requesting an appointment. But priority will always be given to those clients who have an appointment. Therefore, if you come without an appointment you will have to wait until there is a free slot for you.
Yes, always. Until payment is made, the appointment is not reserved on the day and time chosen.
Both tests are used to diagnose whether a patient is positive or negative for COVID. However, there are three main differences between the RT-PCR test and the rapid antigen test: 1- The time in which the results are known: the RT-PCR reports are delivered on the same day, while the rapid antigen test reports are delivered within 15 minutes. 2- Sensitivity: the RT-PCR test is able to detect the presence of the virus with very low viral loads, while the antigen test is more effective with higher viral loads. 3- Reliability: as mentioned in the previous point, the RT-PCR test is more reliable, as it is able to detect extremely low viral loads. This does not imply that the rapid antigen test is not safe, since the sensitivity of our tests is 87.25% and the specificity is 100%.
Yes, if you have tested positive for COVID, we are the only laboratory that indicates the viral load estimation in the results report of your RT-PCR test (depending on the Cycle Threshold (CT) in which virus gene levels start to be detected): low, medium or high. Consequently, the level of viral load will be directly related to the phases of the COVID: high at the beginning and low at the end of the COVID disease.
The price of a rapid antigen test is €50 per person. The results are sent to the email address you used to make the appointment within 15-20 minutes. The report is issued in both English and Spanish, with the corresponding QR code and are suitable for travel to any destination in the world that accepts this type of test.
It depends on the test, since the sensitivity of the RT-PCR test is much higher. Although there is no scientific evidence, with an RT-PCR test it is possible to detect viral load between 3 and 5 days after contact, while in the case of a rapid antigen test you will have to wait between 5 and 7 days after contact for the test to detect the possible viral load.
Depending on the type of antibodies you want to measure: IgM or IgG. IgM antibodies are the first antibodies that are generated in our body during the infection phase. Immunoglobulin G antibodies begin to be produced in the final phase of infection and their presence indicates that we have protection against the virus. It is the most abundant type of antibody in the body and takes some time to form after any infection, in this case by SARS-CoV-2 infection.
When the patient wants to know if he/she still has immunity against COVID, once several months have passed since the last dose of the vaccine was administered or since the disease has passed.
These tests are complementary, as each test identifies a type of immune response to SARS-CoV-2. The ELISA test identifies antibodies and the Cellular Immunity Test detects cytokines released by T lymphocytes. Since the antibodies eventually disappear from the body, an ELISA test may be negative if performed on a person who has been free of the disease for months. However, that same person may still have cellular immunity, which is detected with a Cellular Immunity Test.
The RT-PCR (Reverse Transcription-Polymerase Chain Reaction) test is not influenced by vaccination status as it only tests for the presence or absence of the virus in the body. COVID vaccination does not influence the results of diagnostic tests (RT-PCR and antigen test), but it can affect the results of antibody tests or serological tests (presence of antibodies and ELISA).
Although it is not mandatory for travel, we can issue the EU COVID Digital Certificate only upon explicit request of the client and provided that the consent form required by the Consejería de Sanidad de la Comunidad de Madrid is signed on the same day of the test to authorize us to issue the certificate of your negative RT-PCR or antigen test. Certificates cannot be issued if your test result is positive, nor do we issue EU COVID Digital Certificates for full vaccination regimen or COVID recovery. We will email you the digital certificate the day after your test and there is no charge.
The minimum validity times to take your test usually range from 24 hours before your flight to 72 hours before. It will depend on the destination. We recommend that you check with the airline or the health authorities of the country you are traveling to so that they can indicate the type of test required to cross the border and the maximum time required for it to be valid.
Due to the constant change of policies related to COVID prevention, Life Length can only provide informal information, but it is up to you (the client) to check with your airline or the health authority of your destination country. We recommend that before requesting your appointment with us for a test, you get information through official and reliable means. Our laboratory performs all COVID-related tests and certificates required for safe flight; you can find more information about these tests on our website.
Life Length Laboratories communicates all test results, positive and negative, to the Community of Madrid health authorities. However, after receiving a positive result, we advise you to contact your primary care physician for a proper follow-up.
Yes, the results report is automatically generated in both languages at the same time, in English and Spanish, with their corresponding QR codes.
In some occasions the analysis of RT-PCR tests can be affected by various technical factors that do not allow a definitive reading of the result and make it necessary to repeat the analysis. There is no need to take a new sample and the result will not be affected by having to be analyzed a second time.
Of course, as long as the report has already been issued. Just let us know your desire to print the report when you visit us and we will do it as soon as possible, as long as the reception staff has a couple of minutes to spare.
Yes, we do. We have special discounts for families or groups. You can take advantage of any of the two discount coupons FAMILIA8 (8% discount for purchases between €221 and €439) or FAMILIA12 (12% discount for purchases of €440 or more). Both applicable during the purchase process and in a single payment. Children's tests do not have an additional discount.
You are entitled to a refund if you request it in writing, with all the necessary information and at least 24 hours before your appointment. The Financial Department will proceed to refund the amount paid as soon as possible, although it could take up to 15 days. You can check our policy for changes and refunds on the online appointment portal,
Yes, you can change it through our website in the "My Medical Appointments" section, at least three hours before the time of your reservation.
Yes, as many as you wish. For all the appointments you request, we will ask you for information about each of the people who will be tested, so that their data will appear in the results report.
The boxes of 20 antigen tests are priced at €200 and the box of 25 rapid antibody tests costs €250. To these prices we would have to add the shipping costs of €15, unless you wish to pick up your order at our clinic at Paseo del General Martínez Campos 46 in Madrid.



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