A Fab fragment of human antigen is provided, which is expected to be helpful in the diagnosis of cancer, especially rectal cancer, breast cancer, lung cancer, thyroid cancer or the metastatic cancer produced by it. There is also a diagnostic strategy that uses a combination, including magic Shards. The present invention provides a part of Fab anti ceacam5 human antibody, which includes a heavy chain fragment,It includes a variable heavy chain region, which is composed of amino acid sequence, represented by the amino acid position of SEQ No.: 1-121; the light chain includes a variable light chain region, which is composed of amino acid sequence, represented by the position of SEQ 1-112. Ibid., No. 4, and a transposition containing a Fab fragment.
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