1. See also

Factor X, also known as Stuart-Prower factor or as thrombokinase, is an enzyme.

Factor X may also refer to:

• Factor X (Ailyn album), a 2007 album by Ailyn
• Factor X (Chile), the Chilean version of The X Factor
• Factor X (Portuguese TV series), the Portuguese version of The X Factor
• Factor X (Spain), the Spanish version of The X Factor
• El Factor X, the Colombian version of The X Factor
• Factor X, a reference to protoporphyrin IX or haemin when used to identify Haemophilus influenzae in a microbiology laboratory

See also

• X Factor (disambiguation)

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