Blood Drug Testing

Is there a way to find out your blood type without tests if you know both parents blood types?

I know both parents blood types so is there a way to find out without tests? like working it out or something?

Public Comments

1. No, not for sure. One of the parents make be a positive or negative and you would really know which one the offspring would be. My mother is a A+ and my dad is B-. I am B-.
2. There is a couple of internet sites that can help you narrow it down to a few, but you will never for sure until you are tested. I know a couple who are both A-. They had 6 children. 5 of the children were A-. However, 1 of the 6, turned out to be O-. So you never really know for sure. Although you can narrow it down to just a couple of blood types by knowing the parents blood types.
3. Check your hospital bracelets from when you were born or any visit after. Or ask your mom, most mothers know. except in my family where my mom only knows mine. You can also do the squares A B B ab bb O ao bo This is my families. I'm AB and my younger brother is B both older siblings are A
4. you could, but it woudn't be 100% positive. just ask a doctor. the way you could do it is by a punnent square, but that gives chances of you having it, and rarely there is a 100% chance on anything with that especially with blood because it is expressed by dominant and recessive genes a lot so just ask a doctor to do a blood test, not that bad.
5. Give blood and they will tell you.
6. I've looked into this myself recently, but it seems that knowing both your parents blood group will only narrow down the range of possibilities in relation to their children's blood groups. My parents are B+ and O+ and I am B+, but one of my sisters has a rare negative blood group. Don't know what my other siblings blood groups are, but I know there are quite a few possibilities. Looks like you will need a test, unless your parent has been told what your blood group was when you were born.
7. yes your doctor can tell you
8. You'll never be sure without being tested, and most likely, you'll just narrow it down to a few possibilities. It also helps if you know your grandparent's blood types--that can help show what possibilities are really there. There are, however, random mutations and rare blood type genes that crop up from time to time, so what you figure out as possible may not actually match your blood type. I've explained below how to figure it out, but it could be confusing if you don't have any background in genetics. There are calculators on-line to help you figure it how, however! Here's an example: http://www.biology.arizona.edu/Human_Bio/problem_sets/blood_types/btcalcA_popup.html Basically, ABO and Rh are passed down separately. For both, each parent has two copies of each gene, and gives one copy of each gene to you. A and B are dominant over O, and Rh + is dominant over Rh -. This means that: A type: AA or AO genetically B type: BB or BO genetically AB type: AB genetically O type: OO gentically + type: +- or ++ genetically - type: -- genetically When your parents make you, you get one copy of each gene. If both parents are O-, we know that both are O O - - genetically, which means that each parent had to give O- to you, so you're O O - - with O- blood type. For any other combination, you're going to end up getting multiple different results. Here's another example: A+ mother, AB- father. The mother is either AO+-, AA+-, AO++, or AA++. The father is AB--. The mother could give A+, A-, O+, or O- to you. The father could give A- or B- to you. You could end up with AA+-, AA--, AO+-, AO--, AB+-, AB--, BO+-, or BO-- (types A+, A-, A+, A-, AB+, AB-, B+, or B-). If you share their blood types, I can help you figure out the possibilities. You could also donate blood to find out for sure and for free!