Factor 13 in coagulation pathway?

[anbuitachi]

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Is this required for blood to clot? In first aid it says PTT does not test factor 13... why... not? same goes for PT. thanks

 

[loveoforganic2]

The cleavage of fibrinogen to fibrin = clot formation. FXIII just strengthens that "soft clot"

 

[anbuitachi]

thanks!