What is the most common type of blood stain?

What is the most common type of blood stain?

The most common type of bloodstain pattern found at a crime scene is impact spatter. The pattern occurs when an object impacts the source of the blood. Spatter projected outward and away from the source, such as an exit wound, is called forward spatter.

What are the 4 ways to describe the edge characteristics of blood stains?

Edge characteristics, or the features around the outside of the stain, examined include: satellite spatter, a smaller bloodstain that originated from a main parent stain due to the blood impacting the surface; spines, linear projections connected to the parent stain when satellite spatter fails to form; pooling; and …

How do you categorize blood evidence?

From what may appear to be a random distribution of bloodstains at a crime scene, analysts can categorize the stains by gathering information from spatter patterns, transfers, voids and other marks that assist investigators in recreating the sequence of events that occurred after bloodshed.

What are the 4 types of passive bloodstains?

• Passive. a. formed from the force of gravity acting alone. b. subdivided (drops, drip patterns, pools, clots) c. oozing or gushes from the body, dripping finger or arm, drops from a knife.
• Transfer. a. wet bloody surface comes in contact with a secondary surface. b. wipe, smudge, swipe or smear. c.
• Projected blood spatter.

What does type AB blood contain?

Blood group AB has both A and B antigens, but no antibodies.

What are the three types of blood patterns?

Bloodstains are classified into three basic types: passive stains, transfer stains and projected or impact stains.

How do you describe blood stains?

Spatter Stain – A bloodstain resulting from a blood drop dispersed through the air due to an external force applied to a source of liquid blood. Spines – A bloodstain feature resembling spokes or rays emanating out from the edge of a blood drop; they result from the drop contacting a non-smooth surface.

What are the 4 parts of blood?

Blood is a specialized body fluid. It has four main components: plasma, red blood cells, white blood cells, and platelets. Blood has many different functions, including: transporting oxygen and nutrients to the lungs and tissues.

What is a peripheral ring stain?

Perimeter Stain – An altered stain that consists of the peripheral characteristics of the original stain. Plasma – The clear, yellowish fluid portion of blood. Spatter Stain – A bloodstain resulting from a blood drop dispersed through the air due to an external force applied to a source of liquid blood.

What is a drip stain?

Drip Stain A bloodstain resulting from a falling drop that formed due to gravity. Drip Trail A bloodstain pattern resulting from the movement of a source of drip stains between two points.

What does AB blood type mean?

Group AB: The red blood cells have both A and B antigens, but the plasma does not contain anti-A or anti-B antibodies. Individuals with type AB can receive any ABO blood type. Group O: The plasma contains both anti-A and anti-B antibodies, but the surface of the red blood cells does not contain any A or B antigens.

What are the three types of blood stains?

Bloodstains are classified into three basic types: passive stains, transfer stains and projected or impact stains. Passive stains include drops, flows and pools, and typically result from gravity acting on an injured body.

What are the different Blood Stain Patterns?

So different types of blood stains are analyzed and considered for different purposes. One of the many types of blood stains is known as blood spatter. If you step into a puddle you would see that the water splatters out in a certain pattern- in the form of tiny droplets. The types of blood stain are similar to those droplets of water.

What is projected blood stain?

– Castoff- A blood stain pattern that is created when blood is released or thrown from a bloody object in motion. – Impact –A blood stain pattern resulting from an object striking liquid blood. – Projected-A blood stain pattern that is produced by blood being released under pressure–for example, arterial spurting.

What is bloodstain pattern analysis?

Bloodstain pattern analysis (BPA), one of several specialties in the field of forensic science , involves the study and analysis of bloodstains at a known or suspected violent crime scene with the goal of helping investigators draw conclusions about the nature, timing and other details of the crime.