Bloodstain Pattern Analysis Terminology

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


[A bloodstain pattern created when a source of blood remains stationary over a surface causing an accumulation of blood.]*
Bloodstain Example - Pool
Bloodstain Example - Pool


This pattern was generated by placing a source of blood approximately 2 cm from the target and keeping it there to accumulate enough volume.

A pool of blood may be formed if there is enough blood in the source and it is not too far from the target. As the source is raised from the target it more likely will form a drip pattern. However if there is sufficient volume the drip pattern can be obscured and all that remains is the pool of blood.

Alternate Terminology

Bevel & GardnerNon-spatter Family - Regular Margin - Pool
James, Kish & SuttonPassive - Contact/Transfer - Large Volume - Pooling
WonderSpatters Not a Criteria - Volume
SWGSTAINPool - A bloodstain resulting from an accumulation of liquid blood on a surface.
* This definition is not from the IABPA terminology list. IABPA does not currently provide an official definition.