voluntary guarding

vol·un·tar·y guard·ing

abdominal muscle spasm that can be suppressed at will.
References in periodicals archive ?
Rigidity and voluntary guarding are when the child has a very tight abdominal wall and it is hard to push down at all.
Abdominal examination revealed right upper quadrant tenderness and voluntary guarding.
Upon physical examination, she had diminished bowel sounds and periumbilical tenderness with voluntary guarding.

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