The only ship I know provides this facility in it's medical centre is Peter Deilmann's Deutschland, which is mainly aimed at the German market though it can be booked in the UK and has English speaking crew. It is a very attractive ship and quite small --about 25,000 tons Ithink.
There may of course be others--you need to check with the lines you are considering. Cynthia.
Thank you for taking the trouble to answer, yes we are looking at all the lines. When you read the general advertising for the cruise companies they give the impression that it is no big problem. We are beginning to realise that although cruise companies can look after your dietary needs, some medical problems pose obstacles that may be beyond their scope?
Visit www.dialysisholidays.co.uk they are a company specialising in haemodialysis cruises based in the UK. My friend booked through them and said they are really helpful and professional.