The present invention provides a method for diagnosing venous thromboembolism (VTE), comprising: detecting the level of an integrin ²1 subunit, an integrin ²2 subunit, and/or an integrin ²3 subunit in a blood sample. Also provided is a reagent kit for diagnosing VTE, comprising a substance capable of specifically binding to the integrin ²1 subunit, the integrin ²2 subunit, and/or the integrin ²3 subunit.
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