Frequently Asked Questions

Common Questions and Answers

Please click on the questions below in order to reveal their answers.


What is coronavirus testing?

Coronaviruses are enveloped RNA viruses that are distributed broadly among humans and that cause respiratory, enteric, hepatic, and neurologic diseases.

MEDsan UK provides both antigen and antibody rapid tests for UK businesses to use to test their employees for coronavirus.

Antigens are molecules capable of stimulating an immune response. Antigen tests identify individuals who are currently infected with a virus. Our SARS-CoV-2 Antigen Rapid Test detects the specific antigens of SARS-CoV-2 (Severe Acute Respiratory Syndrome Coronavirus 2 – the virus that causes the disease known as COVID-19) in secretions in the nose or throat.

Antibodies are produced by the immune system in response to exposure to antigens. The IgM antibody to COVID-19 can be detected within 7 days after infection, and the IgG antibody can be detected within 14 days after infection. The combination of both antibodies IgM and IgG can be detected within 14-21 days after infection. IgG remains positive, but the antibody level drops overtime.

MEDsan’s COVID-19 IgM/IgG Rapid Test Hybrid is a solid phase immunochromatographic assay for the rapid, qualitative and differential detection of IgM and IgG antibodies against novel coronavirus SARS-CoV-2 infected cells in human whole blood, serum or plasma. You can read more about rapid antibody testing here.


What if I test positive?

If you test positive:

  • You must immediately self-isolate to prevent spreading the virus to others
  • You should then contact the NHS on 111 who will advise you on the next steps to take

How accurate are your coronavirus tests?

The accuracy of medical tests is measured by specificity and sensitivity. Specificity measures the proportion of negatives that are correctly identified. Sensitivity measures the proportion of positives that are correctly identified.

MEDsan’s COVID-19 IgM/IgG Rapid Test Hybrid has a specificity of 100% and a sensitivity of 98.3%

MEDsan’s SARS-C0V-2 Antigen Rapid Test has a specificity of 99.8% and a sensitivity of 92.5%

MEDsan’s Multiplex SARS-CoV-2 & Flu A/B Rapid Test has a specificity of SARS-CoV-2: 99.8% | Influenza A: 98.9% | Influenza B:99.0% and a sensitivity of SARS-CoV-2: 92.5% (for samples with Ct values ≤ 33 = 96.5%) | Influenza A: 97.9% | Influenza B: 97.9%

The medical testing device contained within our kits has an EC-Declaration of Conformity issued by MPC International of Luxemburg.

The accuracy of our tests have been verified by the University of Geneva.


What is the test procedure?

Test Procedure for MEDsan SARS-C0V-2 Antigen Rapid Test and MEDsan Multiplex SARS-CoV-2 & Flu A/B Rapid Test:

Please note these tests must be administered by a trained healthcare professional.

Nasopharyngeal specimen collection:

  1. Ask the patient to take off the mask and to blow their nose to clear nasal passage of excessive mucus.
  2. Tilt the patient’s head back to 70 degrees.
  3. Insert swab into the nostril. Swab should reach the surface of posterior nasopharynx. Gently swirl the swab for 5-10 seconds to absorb secretions.
  4. Gently remove the swab while rotating it.
  5. Place the swab into prepared extraction tube.
  6. Ask the patient to reapply their mask.

Oropharyngeal specimen collection:

  1. Ask the patient to take off their mask and to blow their nose to clear nasal passage of excessive mucus.
  2. Tilt the patient’s head back to 70 degrees.
  3. Insert swab into the nostril. Swab should reach the surface of posterior nasopharynx. Gently swirl the swab for 5-10 seconds to absorb secretions.
  4. Gently remove the swab while rotating it.
  5. Place the swab into prepared extraction tube.
  6. Ask the patient to reapply their mask.

Test Procedure:

Allow test device, specimen, buffer and/or controls to equilibrate to room temperature (15-30 degrees centigrade) prior to testing and use it as soon as possible.

  1. Add all of one single buffer into a single use extraction tube.
  2. After specimen collection, insert the swab into the extraction tube which contains the buffer and rotate the swab constantly. Repeat several times and incubate for at least 1 minute.
  3. Squeeze the swab on the tube wall so that the liquid is screwed out. Take out and discard the swab according to the treatment of medical waste.
  4. Cover the extraction tube with its dispensing tip.
  5. Remove the test device from the sealed foil pouch and place it on a clean and even surface. Add 2 drops of the sample solution vertically into the sample well of the test device.
  6. Wait 15 minutes to interpret and record the test result. The result is invalid after 20 minutes.

Test Procedure for MEDsan COVID-19 IgG/IgM Rapid Test Hybrid:

  1. Remove the test cassette from the sealed foil pouch and use it as soon as possible. Best results will be obtained if the assay is performed within one hour.
  2. Place the test kit on a clean and level surface.
  3. Add 5 μL of whole blood / serum / plasma to the well of the test cassette, then add 2 drops (about 60 μl) of sample buffer to the well immediately.
  4. Wait for the coloured line(s) to appear. The result should be read at 10 minutes. Positive results may be visible as soon as 2 minutes.

Do not interpret the result after 15 minutes.


How do I interpretate results?

Test Results Interpretation for MEDsan’s SARS CoV-2 Antigen Rapid Test:

Positive – If the C band and T band are both present, then the test indicates the presence of SARS-CoV-2 antigens in the specimen. The test result is positive. The purple red test line may vary in shade and intensity depending on the detected antigen concentration. Also, a light or faint test line must be interpreted as a positive result.

Negative – If only the C band is present, the absence of any burgundy colour in the T band indicates that no SARS-CoV-2 antigens are detected. The test result is negative.

Invalid – Control line C is missing, or control line C and test line T are missing. Incorrect specimen volume or incorrect procedural techniques are the most likely reasons for control line failure. Read the instructions carefully again and repeat the test with a new test device. If the problem persists, discontinue using the test device immediately and contact MEDsan UK.

Test Results Interpretation for MEDsan’s Multiplex SARS-CoV-2 & Flu A/B Rapid Test:

Negative – If only the C band is present, the absence of any burgundy colour in the T band indicates that no influenza A/influenza B/ SARS-CoV-2 antigens are detected in the specimen. The test result is negative.

Positive – If the C band and T band are both present, then the test indicates the presence of influenza A/ influenza B /SARS-CoV-2 antigens in the specimen. The test result is positive. The purple red test line may vary in shade and intensity depending on the detected antigen concentration. Also, a light or faint test line must be interpreted as a positive result.

Invalid – Control line C is missing, or control line C and test line T are missing. Incorrect specimen volume or incorrect procedural techniques are the most likely reasons for control line failure. Read the instructions carefully again and repeat the test with a new test device. If the problem persists, discontinue using the test device immediately and contact MEDsan UK.

Test Results Interpretation for MEDsan’s COVID-19 IgG/IgM Rapid Test Hybrid:

Negative – If only the C band is present, the absence of any burgundy colour in the both T bands (IgG and IgM) indicates that no anti-COVID- 19 antibodies are detected in the specimen. The result is negative.

IgM Positive – In addition to the presence of C band, if only IgM band is developed, the test indicates for the presence of IgM anti-COVID-19 in the specimen. The result is IgM anti-COVID-19 positive.

IgG Positive – In addition to the presence of C band, if only IgG band is developed, the test indicates for the presence of IgG anti-COVID- 19 in the specimen. The result is IgG anti-COVID-19 positive.

IgG and IgM Positive – In addition to the presence of C band, both IgG and IgM bands are developed, the test indicates for the presence of both IgG and IgM anti-COVID-19 in the specimen. The result is IgG and IgM anti-COVID-19 positive.

Invalid – Control line fails to appear. Insufficient specimen volume or incorrect procedural techniques are the most likely reasons for control line failure. Review the procedure and repeat the test with a new test kit. If the problem persists, discontinue using the test kit immediately and contact MEDsan UK.


How do I store the test?

Our test kits can be stored at room temperature or refrigerated (2- 30°C). The test devices are stable through the expiration date printed on the sealed pouch. The test devices must remain in the sealed pouch until use.

DO NOT FREEZE. Do not use beyond the expiration date.


Are there any age restrictions?

There are no limitations to age, it is safe to test babies and children.


Are your tests CE Certified?

Yes, all of our tests are CE marked for professional use and are therefore registered IVD devices.

Our COVID-19 IgM/IgG Rapid Test Hybrid is approved within the guidelines of the MHRA published their website on 8th April 2020.


How do the tests respond to the coronavirus vaccines?

The MEDsan Covid-19 IgM / IgG Rapid Hybrid Test will be able to identify when you and your colleagues have developed IgG coronavirus antibodies after your vaccine. Please note that we recommend waiting until 3 weeks after your second dose before testing yourself for antibodies generated by the vaccine.

Our rapid antigen tests are able to identify those who are currently infected with coronavirus, including those who have been vaccinated. It is possible to still contract coronavirus and be infectious even after vaccination.