Blood Typing
What type are the 4 blood types?
A, B, AB, O
What are 'spines' on a drop of blood?
Spines radiate out from a blood drop when it falls.
What information does the 'tail' of a blood drop provide?
It points the direction the blood was moving so we know the direction where the blood came from
What is the purpose of a Presumptive Test?
To determine if a stain is blood or not blood.
What do we call the proteins that are around the outside of red blood cells that determine blood type?
what is a blood stain that comes off the parent drop and is smaller called?
Satellite
A blood stain has a length of 12 and a width of 5. If we use this formula, what are we calculating?
Angle of Impact
Which blood type is most common?
O
What are the proteins that may be found in in a blood sample?
A, B, and Rh (+/-)
There are large round drops pooled on the floor. What type of velocity caused this spatter?
Low velocity
What type of evidence would Blood Spatter Patterns be considered? Direct or Indirect (circumstantial)?
Circumstantial evidence (Indirect)
What blood type is the universal donor?
O
A patient needs an emergency blood transfusion. Their blood type is AB.
A, B, AB, O
As height increases, the diameter of the blood stain will _____________ until a certain point
increase
As the angle of impact for a blood drop becomes smaller (closer to 0 degrees), the shape of the blood drop....
becomes more elongated
A victim was attacked and defended himself with a pocket knife. He managed to cut his attacker on the arm. The blood on the knife was analyzed and found to be AB-. A suspect was brought in with a cut on his arm. This suspect had AB- blood. What type of evidence is this blood type (class or individual)?
Class. Blood type is always class evidence.