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Platelets drive the initial stop-bleeding response (primary hemostasis) by sticking to damaged vessels and forming a platelet plug. With a count of 75,000, there are enough platelets to prevent spontaneous, everyday bleeding, but not enough to form a rapid, robust plug at the sites of surgical incision and tissue injury. During surgery, ongoing tissue trauma continually activates platelets; fewer platelets mean slower plug formation and more persistent oozing from the surgical site. That translates into prolonged bleeding rather than an immediate or spontaneous bleed.

Normal platelet counts are about 150,000–450,000. Spontaneous bleeding tends to occur when counts fall much lower, and hypercoagulability is not a typical consequence of thrombocytopenia. So the most likely issue during surgery with a platelet count of 75,000 is prolonged bleeding due to impaired primary hemostasis.