WordNet (r) 3.0 (2006):

biopsy
    n 1: examination of tissues or liquids from the living body to
         determine the existence or cause of a disease

Moby Thesaurus II by Grady Ward, 1.0:

25 Moby Thesaurus words for "biopsy":
   Pap test, anatomic diagnosis, biological diagnosis,
   clinical diagnosis, cytodiagnosis, diagnosis,
   differential diagnosis, digital examination, electrocardiography,
   electroencephalography, electromyography, examination,
   laboratory diagnosis, mammography, oral examination,
   physical diagnosis, physical examination, postmortem diagnosis,
   serodiagnosis, smear, study, test, urinalysis, uroscopy, work-up