The CKS guideline on IBS [1] reports:"Investigate?Investigations are not generally necessary for people with IBS symptoms who do not have 'red flags'. Consider:Blood tests — full blood count, erythrocyte sedimentation rate, C-reactive protein, thyroid function, liver function, endomysial autoantibodies (for coeliac disease) — all normal in IBS. (Source: NLH Question Answering Service)

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