What are the three types of blood patterns?

What are the three types of blood patterns?

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

What is a smear pattern?

Smear Pattern — a large volume of blood, at least 0.5 ml, which has been distorted so much that further classification is not possible. Smudge Patterns — another reference to a bloodstain that has been distorted to such a degree that further classification is not possible.

What is a drip trail pattern?

Drip Trail – A bloodstain pattern resulting from the movement of a source of drip stains between two points. Forward Spatter Pattern – A bloodstain pattern resulting from blood drops that traveled in the same direction as the impact force.

How do you swipe and wipe a pattern?

– These patterns are created when a wet, bloody object comes in contact with a target surface; may be used to identify an object or body part. – A wipe pattern is created from an object moving through a bloodstain, while a swipe pattern is created from an object leaving a bloodstain.

What are the two phases of bloodstain pattern interpretation?

Bloodstain pattern analysis is performed in two phases: pattern analysis and reconstruction. 1. Pattern Analysis looks at the physical characteristics of the stain patterns including size, shape, distribution, overall appearance, location and surface texture where the stains are found.

What is the first step in characterizing a bloodstain pattern?

In order to characterize a bloodstain pattern, it is first necessary to macroscopically (with the unaided eye) review the crime scene. Typically, the point where the violence started will be close to the location where the least amount of blood is observed at the scene.

What is the second rarest blood type?

The Stanford School of Medicine Blood Center ranks blood types in the United States from rarest to most common as follows:

• AB-negative (.
• B-negative (1.5 percent)
• AB-positive (3.4 percent)
• A-negative (6.3 percent)
• O-negative (6.6 percent)
• B-positive (8.5 percent)
• A-positive (35.7 percent)
• O-positive (37.4 percent)

What blood type is A positive?

If your blood is A positive (A+), it means that your blood contains type-A antigens with the presence of a protein called the rhesus (Rh) factor. Antigens are markers on the surface of a blood cell. According to the American Red Cross, this is one of the most common blood types.