Your doctor will go through your history and circumstances that may
apply as obviously he is monitoring your coagulation times for a
reason.  My general comments are as follows.

The initial action is usually a repeat test of the prolonged test in
question.

Prolongation of the PT or PTT are divided into two broad groups. Those
with factor deficiency and those with circulating anticoagulants. The
next step would be to distinguish the two by an additional test called
a mixing study or a 1:1 mix PTT.
Factor deficiencies can be corrected with mixing it with normal plasma
and such correction would yeild a normal PTT. When an anticoagulant is
present then correction is incomplete and not correct the PTT into the
normal range. Once the broad group is determined then specialty testing
detecting which factor and or other additional tests would be needed to
further characterize the abnormality.

Most causes of factor deficiencies are factor production decrease or
factor consumption. Vitamin K factors usually affect the PT and Von
Willebrand's disease the PTT as it is related to factor VIII. The body
produces a natural anticoagulants such as antithrombin III, protein C
and protein S. Some of these may be lost in the urine and thus render
some people with nephrotic syndrome susceptible to clot formation and
thus a form of clotting factor consumption.

Common cause for a circulating anticoagulant is the lupus
anticoagulant. Although invivo a clot thrombotic episodes rather than
bleeding is associated with the invitro prolongation.

Your typo above should be PT and not PTT and the 9.0 is a normal PT
result.