Blood Serology
Charcteristics
Charcteristics
The Fluid portion of blood
What is plasma?
Term used to describe laboratory tests using reactions of blood serum and other body fluid.
What is Serology
Series of questions asked by evidence technician when a spot of fluid is found at a crime scene. (In order)
Is it blood?, Is it Human blood?, Whose blood is it?
This percentage of blood consist of cells (solid portion)
What is 45%?
Cell found in blood that can not be used for DNA testing
Red Blood Cells - no nucleus
The Three cells found in blood
What are ?Red blood Cells, White blood Cells, Platelets
Substance found on red blood cells (foreign body which helps to denote blood type)
What are antigens
Name two common presumptive tests used to determine if a spot found at a crime scene is blood
Kastle-Meyer; Luminol; Microcrystalline; Hemastix strip; or Benzidine (no longer used)
This percentage of blood is plasma (Liquid portion)
What is 55%
What blood type is considered to be the "universal recipient"
AB
Scientific Name for red blood cells
What is erythrocytes
Having different alleles for the same trait is referred to as...
What is Heterozygous
Confirmatory Test used to determine if blood found at a crime scene is human blood.
What is Gel Diffusion or Precipitin test
Which blood type is least common in the US
AB-
Scientific name for white blood cells
What is leukocytes
Clumping of red blood cells (results if two blood types with different antigens are mixed)
what is agglutination
The presumptive color test resulting in a hot pink color reaction
What is the Kastle-Meyer Test
When looking at a bloodstain what helps determine direction of travel?
Whether or not there is a tail on the stain and which direction the tail is headed
Responsible for blood clotting
What are platelets or thrombocytes
What percent of an average humans body weight does blood make up
What is 7-8%
This presumptive test is no longer used because it is carcinogenic
What is the Benzidine test?
Blood is used as what type of evidence in the courtroom
circumstantial - argue many points including direction of stains, height of the perpetrator, position of the victim, left/right hand, whether the body was moved, etc.