Our reportable segments are aggregated into two reportable segments, "Animal Hospital" and "Laboratory". Our Animal Hospital reportable segment provides veterinary services for companion animals and sells related retail and pharmaceutical products. Our Laboratory reportable segment provides diagnostic laboratory testing services for veterinarians, both associated with our animal hospitals and those independent of us. Our Medical Technology and Vetstreet operating segments do not meet the quantitative requirements for separate reportable segments and are included in our "All Other" category. Our Medical Technology segment sells digital radiography and ultrasound imaging equipment, related computer hardware, software and ancillary services to the veterinary market and our Vetstreet segment provides online communications, professional education, marketing solutions to the veterinary community and an ecommerce platform for independent animal hospitals. We also operate a corporate office that provides general and administrative support services for our segments.

The accounting policies of our segments are essentially the same as those described in the summary of significant accounting policies included in our 2012 Annual Report on Form 10-K. We evaluate the performance of our segments based on gross profit and operating income. For purposes of reviewing the operating performance of our segments all intercompany sales and purchases are generally accounted for as if they were transactions with independent third parties at current market prices.


9.	Lines of Business, continued