Table 1

Thrombophilia workup when diagnosed with second PE

Laboratory testResult
Cardiolipin antibodyNegative
Antithrombin III92% (within normal limits)
Factor V Leiden mutationNot identified
Protein C level147% (within normal limits)
Protein S level58% (decreased but the lab was obtained while patient was already started on warfarin)
Factor II gene mutationNot identified
Dilute Russel’s viper venom time32.9 s (within normal limits)
  • PE, pulmonary embolism.