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What are the I-IV blood type descriptions shown below (commonly used in Eastern Europe), and how do you translate them into the ABO-system?

enter image description here

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    $\begingroup$ What do you mean by translate? $\endgroup$
    – WYSIWYG
    Nov 11, 2014 at 7:09
  • $\begingroup$ @WYSIWYG: Convert it to the system used in the West: redcrossblood.org/learn-about-blood/blood-types $\endgroup$
    – MikeF
    Nov 11, 2014 at 7:14
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    $\begingroup$ I still don't understand. Isn't it already clear from the image? $\endgroup$
    – WYSIWYG
    Nov 11, 2014 at 7:15
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    $\begingroup$ @WYSIWYG: What's this (I), (II), (III), etc. stuff? I guess that's what I'm asking. $\endgroup$
    – MikeF
    Nov 11, 2014 at 7:17
  • $\begingroup$ I think this description is wrong. Blood type used to be described as AB-I, A-II, B-III and O-IV plus Rh Positive or Negative. $\endgroup$
    – antonio
    Feb 13, 2019 at 23:59

1 Answer 1

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It is a direct correlation between the ABO blood groups and the Roman numerals. 

 O: I

 A: II

 B: III

AB: IV

This numeric system was pioneered by Jan Jansky of Czechoslovakia in the early 20th century. Apparently it is still used in some former Soviet states.

Erb IH. 1940. Blood Group Classification (A Plea for Uniformity). Can Med Assoc J 42(5):418-421.

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    $\begingroup$ I can't upvote it (not enough rep.) But thanks for the info! $\endgroup$
    – MikeF
    Nov 11, 2014 at 7:45
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    $\begingroup$ @MikeF you should be able to accept it by clicking the check mark. $\endgroup$
    – canadianer
    Nov 11, 2014 at 8:01
  • $\begingroup$ What would O+ in the US be in the UK? $\endgroup$
    – user5434678
    May 21, 2016 at 7:13

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