The Parentage Testing Laboratory ABO blood
type calculator
The Parentage Testing Laboratory ABO blood type calculator can
be used to predict possibilities of paternity.
The calculator is used to determine either:
- The ABO blood type of the child when the blood type of the
mother and the father are known (top chart), or
- The ABO blood type of the father if the blood type of the
mother and the child are known (bottom chart).
Parentage Testing Laboratory ABO Blood Type Calculator:
ABO blood types can be complicated to understand. This is mostly
due to the fact that the 'O-type' antigen is masked by the presence
of an A- or B-type antigen. This is explained in the following
chart, showing the different the genotypes that make up the blood
types.
| Genotype
(DNA) |
Blood
Type |
| AO or AA |
A blood type |
| AB |
AB blood type |
| BO or BB |
B blood type |
| OO |
O blood type |
For example, two O blood type parents can produce a child with
only O blood type. Two parents with A blood type can produce a
child with either A or O blood types. Two parents with B blood
type can produce a child with either B or O blood type. One parent
with A and another with B can produce a child with A, B, AB or
O blood types. If one parent has A and another has AB, they can
either produce a child with A, B or AB blood types. If one parent
has A and another has O, they can either produce a child with
A or O blood types.
Rh Positive (Rh+) and Negative (Rh-) Blood
Types
The Rh (+/-) factor is inherited separately from the ABO blood
types. Similarly to the masking effect of the O gene in ABO blood
types, the Rh negative (Rh-) gene is also masked by the presence
of a Rh positive (Rh+) genotype. Therefore, a person may have
a Rh + blood type and can still have an Rh - gene (See the chart
below). Furthermore, 2 parents with Rh + blood types can have
a child with Rh - blood type.
| Genotype
(DNA) |
Blood
Type |
| (+ , -) or (+ , +) |
Rh + |
| (- , -) |
Rh - |
|
