Activated Partial Thromboplastin Time
Also written as APTT.
Prothrombin Time is normal, Activated partial thromboplastin time (APTT)
What our notes say
- Prothrombin Time is normal, Activated partial thromboplastin time (APTT) (HEMATOLOGY EOY 2025 — Past Paper Questions & Answers)
- Full blood count and coagulation screen (prothrombin time and activated partial thromboplastin time) are otherwise normal. (Haematology paper 1 Past Papers — Past Paper Questions & Answers)
- His prothrombin time is normal, activated partial thromboplastin time (APTT) is prolonged and thrombin time (TT) is normal. (Haematology End of Year 2025 Past Paper — MKU MBML 3200 Questions & Answers)
- His prothrombin time is normal, activated partial thromboplastin time (APTT) is prolonged, thrombin time (TT) is normal. (Haematology Exam 2025: MCQs on Anaemia, Leukaemia & Clotting)
Study material on Activated Partial Thromboplastin Time
- Haematology Exam 2025: MCQs on Anaemia, Leukaemia & Clotting
- Haematology End of Year 2025 Past Paper — MKU MBML 3200 Questions & Answers
- HEMATOLOGY EOY 2025
- hsd haematology
- Haematology Exam 2025: MCQs on Anaemia, Leukaemia & Clotting
Practice questions on Activated Partial Thromboplastin Time
A 20-year-old man presents with recurrent joint bleeds. His prothrombin time is normal, activated partial thromboplastin time (APTT) is prolonged, thrombin time (TT) is normal. Which coagulation factor abnormality is most likely?
- Factor VII deficiency
- Dysfibrinogenaemia
- Factor VIII deficiency (haemophilia A)
- Vitamin K deficiency
Answer: C. An isolated prolonged APTT with normal PT and TT, plus haemarthroses, is classic for haemophilia A. ---