Which of the following disorders is least likely to be associated with a prolonged bleeding time?
## **Core Concept**
The bleeding time test is a measure of the body's ability to form a platelet plug and stop bleeding from a small wound. It primarily assesses platelet function and the body's ability to achieve primary hemostasis. Prolonged bleeding time is typically associated with disorders affecting platelet count, platelet function, or blood vessel integrity.
## **Why the Correct Answer is Right**
Option is related to a condition that affects the coagulation cascade rather than primary hemostasis.
## **Why Each Wrong Option is Incorrect**
* **Option A:** is associated with a qualitative platelet disorder, which would affect platelet function and therefore likely prolong bleeding time.
* **Option B:** involves thrombocytopenia (low platelet count), directly impacting the body's ability to form a platelet plug and thus likely prolonging bleeding time.
* **Option C:** affects blood vessel integrity and platelet adhesion, which can lead to a prolonged bleeding time.
## **Clinical Pearl / High-Yield Fact**
A key point to remember is that bleeding time is specifically related to primary hemostasis, which involves platelets and small blood vessels. Conditions affecting the coagulation cascade (secondary hemostasis), such as hemophilia A or B, typically do not prolong bleeding time but may prolong partial thromboplastin time (PTT).
## **Correct Answer: .**