Which finding indicates a risk for bleeding due to low platelets?

• A. White blood cell count increased.
• B. Platelet count of 150,000 per microliter.
• C. Hematocrit normal.
• D. Platelet count 18,000 per microliter.

Answer: (D)

Low platelets mean the body’s first defense to stop bleeding is impaired. Platelets form the initial plug that seals broken vessels, so when the count is very low, bleeding can occur more easily and spontaneously. Normal platelet levels are about 150,000 to 450,000 per microliter; bleeding risk becomes evident as counts drop, especially when they fall into the very low range. A platelet count of 18,000 per microliter is severely low and carries a high risk of bleeding, including mucosal bleeding and more serious hemorrhage. By contrast, a normal platelet count around 150,000 per microliter does not indicate bleeding risk from thrombocytopenia, and changes in white blood cell count or a normal hematocrit don’t directly reflect platelet-related bleeding risk.