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A 45-year-old member asked:

what is a blood group?

2 doctor answers3 doctors weighed in
Dr. Carolyn Thompson
Obstetrics and Gynecology 28 years experience
Blood type: "blood group" and "blood type" are the same thing. Blood types are as follows: a, b, o, and ab. There is also the rh factor, which is + or -. Blood types are inherited traits. Worldwide, o+ is the most common type, and ab- is the rarest type.
Dr. Michael Dugan
Specializes in Hematology
The term blood: Group is used in the same way as blood type, which is determined by surface molecules. So the groups are o, a, b, and ab.

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A 33-year-old member asked:

What's the biggest blood group in the world?

1 doctor answer1 doctor weighed in
Dr. Michael McGonigal
General Surgery 39 years experience
O+ is most common: O positive is the most common worldwide. The rarest is ab-.
0000, PA
A 36-year-old female asked:

What does 0+ blood group mean? And what does 0- blood mean?

1 doctor answer1 doctor weighed in
Dr. Robert Kwok
Pediatrics 33 years experience
Just the blood type: The major blood types are a+ (a positive), b+, ab+, o+; and a- (a negative), b-, ab-, and o-. That means o+ and o- are just two of the basic blood types. There is no advantage to having one of these blood types, compared to another.
A 37-year-old member asked:

Does "sc blood group" exist?

1 doctor answer1 doctor weighed in
Dr. Mehdi Moezi
Medical Oncology 31 years experience
SC Hemmoglobin: Yes it is not a blood group you may mean sc disease which is hemoglobinopathy and combination of sickcle and hemoglobin c and may need treatment an dhematology observation. Ask for referral to hematology.
A 33-year-old member asked:

How could blood groups originate?

1 doctor answer2 doctors weighed in
Dr. Ed Friedlander
Pathology 44 years experience
Genetic drift: There is no obvious selective advantage for A, B or O in nature, and these seem to be the result of random mutations. Some of the African blood groups, famously Duffy Negative, arise in response to selective pressure because it gives immunity to the local form of malaria. You may find this site helpful http://sandwalk.blogspot.com/2007/02/abo-blood-types.html
A 46-year-old member asked:

Negative blood group, what is the significance?

1 doctor answer2 doctors weighed in
Dr. Ed Friedlander
Pathology 44 years experience
Basically none: If you are Rh negative, it doesn't mean "bad". It's simply that you don't have a protein, and if your father's child gives the protein to your unborn child, you can become sensitized. Your physician knows how to deal with this.

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Last updated Oct 14, 2017

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