how many types of blood are there - #23985
I am feeling super confused about blood types and honestly not sure how to figure this out. Like, the other day my kiddo had to get a blood test for school and the nurse said something like, “Make sure you know how many types of blood are there.” But I didn’t really get why it mattered? I mean, I know about A, B, AB, and O, right? But then there’s also the positive and negative, and I'm just trying to wrap my head around how many types of blood are there in total? The whole thing seems super complicated! And what if someone needs a transfusion? Are the types super strict or can they mix some? I mean, when I was a kid, I thought blood was just blood! Now it feels like this whole universe of types. I spent some time googling it but every source seems to say something slightly different, which makes me wonder if I am missing something important. Is there a straightforward way to understand how many types of blood are there, or should I just stick to those four main ones plus the Rh factor? Anyone care to clarify this for me? Thanks in advance for any help!
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