How can I find a lawyer to file a medical malpractice suit when most law firms seem to specialize in defense? Who helps the little guy?

An ER doctor discharged a patient saying the blood tests and CT scan were normal and the patient was "obviously fine", but two days later, blood work was very abnormal. The patient was diagnosed with pancreatitis and admitted to the hospital for multiple days. The specialist said the blood work would not have been normal two days prior, and the patient suffered tremendous pain/discomfort and family members lost money, time, and peace of mind over the issue. Is there a case here, and how does one find a lawyer so as to make sure such things do not happen again?