Arterial Spurting (or gushing) Pattern -- Bloodstain pattern(s) resulting from blood exiting the body under pressure from a breached artery

Back spatter

Back Spatter -- Blood directed back towards the source of energy or force that caused the spatter.

Cast-off pattern

Cast-Off Pattern -- A bloodstain pattern created when blood is released or thrown from a blood-bearing object in motion

High-velocity impact stain (HVIS)

This type of spatter is usually associated with gunshots, explosions and high speed collisions. High force Impact takes on a "mist like apperance.

Medium-velocity impact stain (MVIS)

The force of the impact causes the blood to break into smaller size spatters relative to the amount of force applied, usually seen in blunt force, stabbings and secondary spatters.

Low-velocity Impact stain (LVIS)

These spatters usually fall from an open wound, or from a surface that is saturated with blood, The majority of the Low Force Impact Spatters are large, circular, spatters with diameters of 4mm or more.

Passive Drop

Passive dripping, the slow dripping of blood under gravity, particularly drip trails left by a person moving through the scene

Swipe pattern

A bloodstain pattern resulting from the transfer of blood from a blood-bearing surface onto another surface, with characteristics that indicate relative motion between the two surfaces.

Transfer/contact stain

A bloodstain resulting from contact between a blood-bearing surface and another surface.