Depends on your context and target readers.
The technical term is coagulopathy.
Thieme Leximed med. Wörterbuch:
"Gerinnungsstörung - coagulopathy, coagulation defect"
Dorland's Medical Dictionary
"coagulopathy (co·ag·u·lop·a·thy) any disorder of blood coagulation."
Strictly speaking, disorders of blood coagulation may be divided into "clotting disorders" - excessive clotting leading to formation of blood clots - and "bleeding disorders" such as haemophilia etc.
but in lay terms "clotting disorders" is often used interchangeably with "coagulation disorders" for all types...