PLEASE ANSWER ASAP!!!!!! A 66-year-old mal patient with amyloidosis was admitted to the hospital with severe gastrointes

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PLEASE ANSWER ASAP!!!!!!
A 66-year-old mal patient with amyloidosis was admitted to the
hospital with severe gastrointestinal bleeding. Admission
laboratory data includes:
Hgb 10 g/dL
Hct 0.32
Platelet count: Adequate
PT 45 sec
APTT 95 sec
Fibrinogen 400mg/dL
Thrombin Time 5 sec (4-12 sec)
PT 1:1 mix 13 sec
APTT 1:1 mix 30 sec
Rusell’s Viper venom time 55 sec (14-20 sec)
Questions:
1. Why both PT and APTT test are prolonged?
2. What additional test should be done that would help in the
diagnosis?
3. What test result indicates factor deficiency and not the
presence of circulating anticoagulant?
4. If adsorbed plasma were used in the mixing studies what would
be the expected result?