Bloodstain Pattern Analysis Terminology

Note: At the 2009 IABPA meeting in Portland, OR, USA, the IABPA membership voted to adopt the SWGSTAIN recommended terminology.


Medium Velocity Impact Spatter (MVIS)
A bloodstain pattern caused by a medium velocity impact/force to a blood source. A beating typically causes this type of spatter.
Bloodstain Example - Medium Velocity Impact Spatter (MVIS)
Bloodstain Example - Medium Velocity Impact Spatter (MVIS)


Special Note: The concept of low, medium, and high velocity spatter is no longer recognized as valid by the bloodstain community. This is an impact pattern.

This pattern was generated by placing a small volume of blood on a hard surface and striking it with a rubber mallet.

Medium velocity impact spatter (MVIS) is generally produced by objects travelling between 1.5 m/s and 7.5 m/s. The majority of stains in this pattern are between 1 mm and 3 mm in diameter. This type of pattern is most often associated with blunt force trauma or cutting/stabbing actions.

Alternate Terminology

Bevel & GardnerSpatter Family - Non-linear - Impact Spatter
James, Kish & SuttonSpatter - Impact Mechanism - Beating
WonderSpatter Groups - Impact - Bludgeoning (MVIS)
SWGSTAINClosest to Impact Pattern - A bloodstain pattern resulting from an object striking liquid blood.