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.
Systemic illnesses like diabetes, anemia (low red blood cell count), kidney disease and thyroid and other hormone issues are also potential causes of muscle spasms. Diseases of the nervous system, such as multiple sclerosis or spinal cord injury, can be associated with muscle spasm. Smooth muscle can also develop spasm. When a hollow structure filled with air or fluid is squeezed by the muscle spasm, significant pain can occur since the fluid or air cannot be compressed. For example, smooth muscle in the intestinal wall can go into spasm, causing waves of pain called colic.