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How can you determine your blood type?

can you know the type simply by knowing parents/siblings?

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You can narrow down your blood type by knowing your parents but not get a definitive without a blood test.

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ok. that answered my ? - Thanks
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NO - you can be entirely different from your parents and siblings, so it is VITAL that you know what YOUR blood type is. If you have a serious accident, it takes HOURS of precious time to work out your blood type, whereas if your details are on record, you can get help immediately in the event of an emergency!!!!!!!!!! This is particularly important if there are rhesus factors in your famiy....
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The blood types of the parents can only produce certain types in their kids. As I had answered you need a blood test to get a definitive answer. You can rule out someone's paternity if they can't produce the blood type of the child.
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Only HALF the genetic code comes from the parents - the other half is made up from several previous generations and throw-backs are possible in any genetic trait that has occurred in the family over several generations. I am sure you are right in most cases - and we BOTH agree that you are not safe unless you have had your own, personal type determined.
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thanks doc. was trying to avoid the dreaded needle but I guess i will go to the vampire and get it done.
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You'd have to have blood drawn.. I believe.

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Health office, doctor,clinic.

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ask your dr. next time you go for a visit..

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My doctor won't tell me
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that..would be a "neat" idea for a tatoo..but it should be no Big secret ..especially to you..
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I found out by donating blood and asking for a card with my type on it.

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YOU can't work out your own blood type. A sample has to be drawn and then mixed with other known blood types to determine your compatibilities. This is done by a Hematologist in a laboratory set up to do such complex procedures.... Your family blood types are useful guides, but only a personal analysis will be sure. You need to know in case of accident - tattooing your blood type on your chest or arm is a wise provision, especially if you have a rare blood type.

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thanks doc. good answer
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I found out my blood type by donating blood. It's free, painless ,and you save lives. Also In a couple weeks they send you a official card telling you your blood type.

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You need to have your blood typed in order to really know. Ask your dr. he may know from his records, It's usually not typed on a routine basis. But as shoeler96 said, The blood banks must do it, when you give blood.

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Go donate blood, and within a month, they'll send you a card telling you your type, and Rh factor.

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thank you
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you can give blood(they give you a blood card) or ask your parents what their blood type is...then you just narrow it down.

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vampires usually know a lot about this stuff

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