what does blood type o positive mean

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Is it possible to have both parents with O positive bloodtype, but their child have O negative blood type?

Yes

Blood
The Rh factor is inherited through separate genetic means from the blood type. The Rh factor is a dominant gene, meaning only one gene is needed to cause expression of the factor. So two Rh + parents can have a Rh+/Rh- gene pattern and have a 1/4 chance with every conception of having an Rh-/Rh- baby,1/4 chance of Rh+/Rh+ baby and 1/2 of carrier Rh+/Rh-.
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Dr. Barry T. Kahn answered:

Could you tell me if my mom is o positive what are her parents possible blood types?

Blood typing

Blood
The 4 major blood groups are A, B, AB and O. If your mother is group O, than neither of her parents could be type AB. The others would be possible. Likewise, being Rh positive means that at least one of your mother's parents were Rh positive, but not necessarily both.
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If my parents have a and o positive blood types. is it possible for me to be ab negative?

NO

Blood
YOU CAN ONLY BE A+ OR O+
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Dr. Gurmukh Singh answered:

What does it mean when your blood type is o positive?

Blood donor

Blood
Your red blood cells can be transfused into almost any other person who is Rh positive. It has no implications for your health.
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What does it mean if my blood type is o positive?

Antigens

Blood
You lack either the A or B antigens on your blood cells but do have rH positive antigen. It means you can donate blood to anyone who is rH positive irrespective of their blood type. There is no relationship of blood type to blood function or any aspect of health.
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My blood type is O (positive) , does that mean i can only recieve O ( positive or negative) in case of an emergency?

O Positive

Blood
O + blood type means you have the RH antibody. If you receive O negative blood, which has no RH antibody, you are OK. If you receive O+ blood, you're OK. But if you donate blood, there may be a problem to the recipient, if they have negative blood type. Any transfusion is preceded by a cross match wherein the two bloods are checked for compatibility to lessen the risk of transfusion react.
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Dr. Barry T. Kahn answered:

What exactly does it mean to have o positive blood?

Blood types

Blood
In general there are 4 major blood groups, A, B, AB and O, signifying the presence/absence of certain molecules on the red cell surface. Type A has only "A" molecule; Type B has only "B" molecule; Type AB has both and Type O has neither. The "positive" and "negative" reference refers to the presence/absence of Rh molecule on the red cell surface. O positive is the most common blood group.
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Dr. Robert Kwok answered:

My blood type is O positive. My son is AB. What is my husband's blood type?

Cannot tell

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If a mom has O+ blood type, and says her son is AB (meaning either AB+ or AB negative), there is not enough information to tell what blood type the mom's husband has.
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The husband is AB blood type and wife is O positive. Can we have a A positive blood?

Blood types

Antibodies
You can have children who are A positive or B positive. You potentially could have rh negative children too but that question cant be answered for certain.
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