A 9 year old boy with elevation in both PT and A PTT. What is the diagnosis? –
**Core Concept**
The question involves a 9-year-old boy with elevated Prothrombin Time (PT) and Activated Partial Thromboplastin Time (APTT), indicating a coagulation pathway abnormality. This suggests a problem with the **extrinsic and intrinsic pathways** of blood coagulation.
**Why the Correct Answer is Right**
Given the elevations in both PT and APTT, this points towards a deficiency or inhibitor affecting the **common coagulation pathway** or factors that are common to both the intrinsic and extrinsic pathways, such as fibrinogen or factors X, V, II (prothrombin), and fibrin. A deficiency in any of these factors would lead to an increase in both PT and APTT.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it would only affect the intrinsic pathway, thus only elevating APTT.
**Option B:** Incorrect as it would specifically affect the extrinsic pathway, resulting in an isolated elevation of PT.
**Option C:** Incorrect because it would not account for the elevation in both PT and APTT as seen in this patient.
**Option D:** This could be a possible answer as it might involve a factor common to both pathways, but without the actual answer choice provided, we cannot definitively say.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that when both PT and APTT are elevated, one should consider deficiencies or inhibitors of the common coagulation pathway, such as **vitamin K deficiency** or **disseminated intravascular coagulation (DIC)**, which can affect multiple clotting factors.
**Correct Answer:** D. Liver disease or Vitamin K deficiency or DIC.