We have recruited almost 30,000 participants to the study. Participants were involved in either one of two stages:
Stage 1
- Almost 18,000 participants joined COMPARE Stage 1 between February and May 2016 when attending their routine blood donation session.
- Almost 15,000 participants attended a second donation visit.
- At the second visit, the different methods for measuring haemoglobin levels were tested, including a non-invasive device and capillary hemocue. A blood sample was also taken and measured using a “gold standard haematology analyser”.
- The non-invasive devices and capillary hemocue were only available until the 25th September 2016.
Stage 2
- Over 11,000 participants joined COMPARE Stage 2 between October 2016 and March 2017 when attending their routine blood donation session.
- Participants were required to attend one blood donation session and at this visit haemoglobin levels were tested using NHSBT’s routine method and, also, a non-invasive device. A blood sample was also taken and measured using a “gold standard haematology analyser”