When an individual is suspected of having anorexia nervosa, numerous diagnostic tests are done. These include: Physical Exam This may include measuring height and weight; checking vital signs, such as heart rate, blood pressure and temperature; checking the skin for dryness; listening to the heart and lungs; and examining the abdomen. Laboratory Tests These may include a complete blood count (CBC), as well as additional blood tests to check electrolytes and protein, as well as functioning of the liver, kidney and thyroid. A urinalysis also may be done. Psychological evaluation. A doctor or mental health professional can assess thoughts, feelings and eating habits. Psychological self-assessments and questionnaires also are used. Other Studies X-rays may be taken to check for broken bones, pneumonia or heart problems. Electrocardiograms may be done to look for heart irregularities. Testing may also be done to determine how much energy your body uses, which can help in planning nutritional requirements. Diagnostic criteria for anorexia To be diagnosed with anorexia, you must meet criteria spelled out in the Diagnostic and Statistical Manual of Mental Disorders (DMS), published by the American Psychiatric Association. DSM diagnostic criteria for anorexia are: Refusal to maintain a body weight that is at or above the minimum normal weight for your age and height Intense fear of gaining weight or becoming fat, even though you're underweight Denying the seriousness of having a low body weight, or having a distorted image of your appearance or shape In women who've started having periods, the absence of a period for at least three consecutive menstrual cycles However, some people may not meet all of these criteria but still have an eating disorder and need professional help. As more is learned about anorexia, the diagnostic criteria may change.