Frequently used terms in forensic serology
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| Angle of Impact | The acute angle formed between the direction of a blood drop and the plane of the surface it strikes
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| Arterial Spurting Pattern | Bloodstain pattern(s) resulting from the blood exiting the body under pressure from a breached artery.
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| Back Spatter | Blood directed back towards the source of energy or force that caused the spatter.
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| Cast-Off Pattern | A bloodstain pattern created when blood is released or thrown from a blood-bearing object in motion.
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| Directionality | The direction the blood was traveling when it impacted the target surface.
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| High Velocity Impact Spatter (HVIS) | A bloodstain pattern caused by high velocity impact/force to a blood source such as that produced by a gunshot or high speed machinery.
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| Impact Pattern | Bloodstain pattern created when blood receives a blow or force resulting in the random dispersion of smaller drops.
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| Low Velocity Impact Spatter (LVIS) | A bloodstain pattern that is caused by a low velocity impact so a blood source such as that caused by a punch.
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| Medium Velocity Impact Spatter (MVIS) | A bloodstain pattern that is caused by medium velocity impact to a blood source such as that caused by blunt force trauma with a weapon.
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| Parent Drop | A drop of blood from which a wave, cast-off, or satellite spatter originated.
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| Passive Drop | Bloodstain drop(s) created or formed by the force of gravity acting alone.
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| Point of Convergence | The common point on a two dimensional surface, over which the directionality of several blood drops can be retraced.
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| Point of Origin | The common point in a three dimensional space to which the trajectories of several blood drops can be retraced.
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| Satellite spatter | Small droplets of blood that are distributed around a drop or pool of blood as a result of the blood impacting the target surface.
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| Spine | The pointed or elongated stains which radiate away from the central area of a bloodstain.
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| Swipe Pattern | The transfer of blood from a moving source onto an unstained surface.
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| Target | A surface upon which blood has been deposited.
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| Transfer Pattern | A bloodstain pattern created when a wet bloody surface comes in contact with a second surface. A recognizable image of all or portion of the original surface may be observed in the pattern.
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| Void | An absence of stains in an otherwise continuous bloodstain pattern.
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| Wipe Pattern | A bloodstain pattern created when an object moves through an existing stain, removing and/or altering its appearance.
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