Answer
A falling platelet count can be an early sign of immune-mediated heparin-induced thrombocytopenia, which may be accompanied by new thrombosis.
Sources for this answer
- Heparin Sodium 5,000 I.U./ml Solution for injection (without preservative)emc · SmPC Current selected SmPC · Version 3
- Heparin Sodium 100 I.U./ml flushing solution for maintenance of patency of intravenous devices (Wockhardt UK Ltd) (PL 29831/0111)emc · SmPC Current selected SmPC · Version 7