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.
Causes. The cause of the muscle spasm lies in the fact that the bulging disc is pressing against the ligament that holds it in place. Since this ligament contains nerves, the result is pain. Because of the initial pain, the back muscles go into spasm as part of the body's effort to immobilize the painful area.he cause of the muscle spasm lies in the fact that the bulging disc is pressing against the ligament that holds it in place. Since this ligament contains nerves, the result is pain.