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(Normal range: 28-41 mg/dl (0.28-0.41 g/L

Comment: Deficiency of this enzyme is the most common genetically determined abnormality of complement. Patients usually present with recurrent angioneuotic oedema and /or the urticaria. If symptoms are confined to the gut the patient may present with a recurrent syndrome suggesting intermittent intestinal obstruction. Cyclosporin A treatment may inhibit the enzyme

Sample: Citrated plasma