The following tests should be ordered:

• Full blood count
• Iron studies
• INR, PTT

Bleeding disorder screens can be helpful, particularly if the personal or family history is suggestive of a bleeding disorder, however these tests should be deferred until after the acute episode of menorrhagia has resolved as the results can be affected by stress.

• von Willebrand screen (factor VIII assay, von Willebrand factor antigen, ristocetin cofactor)
• PFA-100

Consider

• Beta-hCG
• Urine chlamydia
• TSH
• PCOS screen
• 17-OH-P