Hi DMR, In the National Health Service Blood and Transplant in England, most of the Donath Landsteiner testing is performed at the NHSBT-Sheffield Centre (although, we do perform the test in my own laboratory at NHSBT-Tooting Centre from time to time). Within this Centre works a very good friend and colleague of mine, Bob Stamps, who is rightly regarded as the DL expert in the UK, having been involved in writing several papers on the subject. It might be worth your while emailing Bob and asking him for some information. The trouble is, I'm not sure of his email address! It is either robert.stamps@nbs.nhs.uk or bob.stamps@nbs.nhs.uk. If you try both, at least one of them should get through! If you are worried about contacting him out of the blue, just mention my name. If this is not urgent, send an email to my work at malcolm.needs@nbs.nhs.uk, detailing exactly what you would like to know, and I will gladly forward it to Bob. I hope this helps. Best wishes, Malcolm