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.
Lower Back Spasm Causes. There are many reasons why muscle spasm may occur. Back injury is a very common factor, since inflammation and neurological trauma are both sources of severe muscular contractions. Usually, back muscle spasms due to injury will subside in a few hours to a few days. It is rare for spasms to last for weeks or months due to physical injury. Poor circulation to any area of the back is the most common source of spasm. This can occur due to structural concerns, such as vascular disease or inflammation, but typically is linked to a psychosomatic back pain syndrome using oxygen deprivation as the enforcer of a subconsciously devised distractive mechanism.