Providing a blood sample at a Data Collection Site

Thank you for your participation in the COVID-19 Antibody Study. You have been asked to participate by providing a blood sample in person. Watch the video to learn what to expect during your visit.

Here is what your participation involves:

  • You will be contacted by CLSA staff to schedule a visit for blood sample collection at your local Data Collection Site.
  • The day before your scheduled visit, CLSA staff will call to confirm your appointment and determine if you have any COVID-19 related symptoms or have been in contact with anyone with COVID-19 symptoms. We refer to these questions as “screening” questions. We will also ask you a few questions to ensure you are able to provide a blood sample the next day.
  • If you have any COVID-19 related symptoms or have been in contact with someone who may have been exposed to the virus that causes COVID-19, we will reschedule your appointment to a time at least two weeks after this call.
  • If you do not have any symptoms and have not been in contact with someone who may have been exposed to the virus, then you will be asked to complete a short questionnaire that includes demographic information, and we will also review questions about any physical or health reasons why we would not be able to safely take a blood sample.
  • When you arrive for your blood draw visit, you will be screened again for COVID-19. You will be required to disinfect your hands and wear a face mask, which will be provided to you.
  • During your visit, you will be asked to provide about 50 mL of blood (about 3 tablespoons).
  • CLSA staff will follow the COVID-19 safety protocols as required by their institution and local public health authority. This will include maintaining a distance of 2 metres whenever possible and wearing appropriate personal protective equipment during your visit. All CLSA staff will be required to wear a face mask, and staff taking blood will also be required to wear gloves, a gown and a face shield. All CLSA staff will undergo COVID-19 screening each day before entering the Data Collection Site. All these precautions are being taken to ensure your safety and the safety of CLSA staff.
  • Results of the antibody test will be made available to you after your blood sample has been analysed. This is expected to take at least three months.
  • You may be contacted again in approximately six months to arrange for a second blood draw.

For questions about the study please contact the CLSA toll-free at 1-866-999-8303 or

For more information: