Some of the secondary reasons to perform testing include: to screen for hepatitis B infection in at-risk populations or in blood donors, to determine if someone is a carrier, to detect previous infection (with subsequent immunity), and to determine if immunity has developed due to vaccination.
Abdominal muscle spasm, also known as abdominal rigidity, is a powerful, involuntary contraction of the muscles of the abdomen.During a spasm, the muscle will feel stiff and tender if you apply pressure.ike any other muscles in the body, your abdominal muscles can have spasms that occur as a result of muscle strain during heavy use or overuse, fatigue, dehydration, and alcohol or drug use.
Muscle spasm facts. 1  Spasms may affect many different types of muscles in the body, leading to many different symptoms and presentations. 2  Spasms of skeletal muscles are most common and are often due to dehydration and electrolyte abnormalities. 3  The spasm occurs abruptly, is painful, and is usually short-lived. If muscle spasms are especially painful, if they do not resolve or if they recur, medical care should be accessed to look for possible underlying causes. 2  Smooth muscles that are within the walls of hollow organs can go into spasm, causing significant pain.