Blood Spatter Terminology - Forensics
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24 Terms
angle of impact
the acute angle formed between the blood droplet’s trajectory and the surface
cast off pattern
a bloodstain created when droplets are flung from blood-covered object
directionality
characteristics of bloodstain that indicates its direction
high velocity impact spatter
mist-like blood stain pattern, produced by external forces
low velocity impact spatter
bloodstain produced from low speed force
medium velocity impact spatter
bloodstain produced from a force 5-100 ft/sec
satellite spatter
secondary blood droplets that detach form main droplet
spine
thorn-like projections that radiate outward from parent droplet
wipe pattern
bloodstain created when an object moves through pre-existing bloodstain (altering)
What are the four components of blood?
red blood cells, white blood cells, platelets, plasma
What is a presumptive blood test?
to determine if stain is blood
What gives blood its color?
hemoglobin (red blood cells)
What type of evidence is blood?
class
negative donate to…
positives, negative
positives donate to…
positives
O- donates to
ALL
0+ donates to
0+, A+, B+, AB+
A- donates to
A-, A+, AB-, AB+
A+ donates to
A+, AB+
A- can donate to
A-, AB-, AB+
B+ can donate to
B+, AB+
B- can donate to
B-, B+, AB-, AB+
AB - can donate to
AB-, AB+
AB+ can donate to
AB+
