At what age is it normal for bone marrow cellularity to be 80% to 90% (i.e., has very little fat)?

An 85-year-old woman has a hemoglobin of 10.5 g/dL. This is:

Warfarin skin necrosis occurs within the first 2 to 3 days after starting warfarin therapy because:

Low-molecular-weight heparin (LMWH):

Select the next best test to run given the following PTT results on a patient’s plasma:Initial PTT: 75 secondsImmediate 1:1 mix with normal plasma: 38 secondsIncubated 1:1 mix with normal plasma: 36 seconds

The bone marrow fibrosis observed in primary myelofibrosis is due to:

Which is an expected finding in polycythemia vera?

When the chromogenic assay for antithrombin is performed, which is true?

A 27-year-old woman arrives at the emergency department with acute bleeding and is found to have a white count of 25.7 × 109L with pancytopenia: hematocrit 27%, platelet count 35 × 109/L, and absolute neutrophil count 0.8 × 109/L. She has a combination of 97% blasts and abnormal promyelocytes in her peripheral blood; some of these cells contain Auer rods. What form of leukemia does she most likely have?

In which substance is a patient with the following coagulation test results most likely deficient? Test Test Result Reference Range Prothrombin time (PT) 18 seconds 11–15 seconds Partial thromboplastin time (PTT) 31 seconds 25–37 seconds Thrombin time (TT) 16 seconds 15–21 seconds