Greenfields laboratory services test for ABO A subgroups and Rh D blood groups. All Greenfields tests are carried out in our haematology lab and the results are available for you to download. The collection kit includes prepaid postage from the UK. This test will tell you if you are blood group A1, A2, B, A1B, A2B, O, Rh D positive or Rh D negative. N.B. This will test for Rh (or Rhesus) D, but not for Rh Cc or Rh Ee.