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This question already has an answer here:

In total how many blood types are there?

And why do people normally know only 8 of them? (A+, B+ , AB+ and O+ and Rh- counterparts)

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marked as duplicate by The Last Word, WYSIWYG, Chris, Satwik Pasani, Bez Jun 3 '14 at 10:05

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • $\begingroup$ As I remember from my physiology studies that there are more systems. So you're interested in the ABO system only or the other ones as well? check this: en.wikipedia.org/wiki/… $\endgroup$ – zeller Feb 5 '14 at 11:15
  • $\begingroup$ @zeller Thank you, anyway I cannot understand why normally we know only ABO system and I cannot understand if each system is only a different "convention" of if it denotes a somewhat different blood system. $\endgroup$ – HAL9000 Feb 5 '14 at 12:00
  • $\begingroup$ Unfortunately I can't answer that, as I haven't studied immunology, but based on my recent readings (on wikipedia...), most of them check different antigenes/ligands/whatevers. $\endgroup$ – zeller Feb 5 '14 at 13:36
  • $\begingroup$ Adding insults to the question will not help to reopen it. Working on the content will. Comments should be added into the comment field. $\endgroup$ – Chris Jun 13 '14 at 21:11
  • $\begingroup$ @Chris insults? What's not clear in "This question has been asked before and already has an answer."? I repeat: the time line goes from left to right, from lower numbers to higher numbers. It's pretty easy. $\endgroup$ – HAL9000 Jun 13 '14 at 21:15

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