The following results were found in a 28-year-old woman as part of a work up for infertility. She has never had a history of bleeding or bruising nor does she have a family history for bleeding.
- What are the causes of an elevated PTT in a non-bleeding patient?
- Describe the additional tests that would be required to make a diagnosis in this case.
- What is a lupus anti-coagulant and how does it alter the PTT?