Bloodstain Pattern Analysis Terminology

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


Cast-off Pattern
A bloodstain pattern created when blood is released or thrown from a blood-bearing object in motion.
Bloodstain Example - Cast-off Pattern
Bloodstain Example - Cast-off Pattern


This example was generated by putting blood on a knife blade and swinging the blade in a downward motion in front of the target.

The volume of the drops and impact angles changed as the knife continued through its downward motion.

Alternate Terminology

Bevel & GardnerSpatter Family - Linear - Cast-off
James, Kish & SuttonSpatter - Projection Mechanism - Cast-off
WonderSpatter Groups - Cast-offs - Swing
SWGSTAINCast-off Pattern - A bloodstain pattern resulting from blood drops released from an object due to its motion.