| Summary: | <p><strong>Background: </strong>Iran has a large group of patients with severe congenital factor XIII deficiency (FXIIID) and Trp187Arg mutation that is most disease causing mutation of FXIII in the world is only observed in southeast of Iran with 352 patients with FXIIID. 743 patients with FXIIID was observed in 17 provinces of Iran but Tehran city with more than 12 million population has no any registered patient with FXIIID. Here we described first case with severe congenital FXIIID in Tehran Province with underline FXIII mutation.</p><p><strong>Methods:</strong> A neonate with prolonged umbilical cord bleeding was referred to hemophilia center. Patient was screened by routine coagulation tests and by clot solubility test. After observation of normal routine tests and abnormal clot solubility patient was underwent a full sequencing of FXIII-A gene. For confirmation of detected mutation in FXIII-A gene, exon 4 was amplified by PCR and cleaved by Eco130I restriction enzyme.</p><p><strong>Results:</strong> We found first case with severe congenital FXIIID in Tehran Province with Trp187Arg mutation in exon 4 of FXIII-A gene. Patient’s parents were heterozygote for this mutation.</p><p>Conclusion: Trp187Arg mutation of FXIII-A is the most common mutation in Iranian patients with FXIIID and is not restricted to southeast of Iran.</p><p><strong>Keywords:</strong> Factor XIII deficiency, Trp187Arg mutation, Tehran Province</p>
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