Bloodstain Pattern Analysis Terminology

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


Low Velocity Impact Spatter (LVIS)
A bloodstain pattern that is caused by a low velocity impact/force to a blood source.
Bloodstain Example - Low Velocity Impact Spatter (LVIS)
Bloodstain Example - Low Velocity Impact Spatter (LVIS)


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 stepping onto a small pool pattern on the target.

Low velocity impact spatter (LVIS) is generally produced by objects travelling less than 1.5 m/s. The majority of stains in this pattern are larger than 3 mm in diameter. There may also be spines radiating from the parent stain. In this example, the shoe came in contact with the bottom portion of the pool first.

Alternate Terminology

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