A 3-year-old male was admitted to a hospital with scattered…

A 3-year-old male was admitted to a hospital with scattered petechiae and epitaxis. The patient had normal growth and had no other medical problems except for chicken pox 3 weeks earlier. His family history was unremarkable. Liver Function and Kidney Function tests are unremarkable.PT = 11.3 seconds (Ref: 10-13 secs)aPTT = 32.1 seconds (Ref: 28-37 secs)Plt Count = 8,000/uLThese clinical manifestations and laboratory results are most consistent with:

Aliquots of plasma with a prolonged PT and prolonged aPTT ar…

Aliquots of plasma with a prolonged PT and prolonged aPTT are mixed using various ratios of patient plasma and normal plasma. All samples are incubated at 37oC and tested at 10-, 30-, and 60-minute intervals. The PT and aPTT results on all of the mixtures are corrected to normal limits. These results are suggestive of:

A patient visits a physician because of unexplained bruising…

A patient visits a physician because of unexplained bruising and prolonged bleeding from a recent tooth extraction. The physician orders a prothrombin time (PT) and an APTT. Results are within normal reference ranges. What other tests could the physician order to investigate the patient’s symptoms?