Of the 61 known blood group antigens, the negative/positive distinction refers solely to antigen D. During blood transfusion, ...

Each of the four main groups can be either Rh-positive (+) or Rh-negative (-), creating these eight distinct blood types: ...

Rh-negative blood was available in limited quantities ... count as the volume of transfused blood increased. The calculated line of regression is almost identical in these two groups.

It's a bit simplistic, but you can think of the Rh factor as a protein that is either present (positive) or absent (negative) on red blood cells. Exact percentages vary with race, but most people ...

While Rh and ABO are the most common blood groups, MAL is different from them, due to an absence of an antigen called AnWj.

Couples are advised to know their blood types before committing to having children (Shutterstock) Couples are often plagued by various problems in marriage including fertility and pregnancy issues.

People having blood group of A, B and those with Rh factor positive are more susceptible to COVID-19 infection compared to those having O or AB group and Rh negative, according to a new study ...