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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
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Anti - T.T.G. antibodies are seen in:
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The correct answer is  Anti-endomysial antibodies of the immunoglobulin A (IgA) type can detect celiac disease with a sensitivity and specificity of 90% and 99%, respectively. Serology for anti-T.T.G antibodies was initially repoed to have a higher sensitivity (99%) and specificity (>90%) for identifying coeliac disease. However, it is now thought to have similar characteristics to anti-endomysial antibody. Modern anti-TTG assays rely on a human recombinant protein as an antigen. TTG testing should be done first as it is an easier test to perform