This week, the overall grades of three medical technology stocks are lower, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

iCAD, Inc.’s (ICAD) rating falls to a D (“sell”) this week, down from C (“hold”) the week prior. Icad is a provider of advanced image analysis and workflow solutions that enable radiologists and other healthcare professionals to better serve patients by identifying pathologies and pinpointing cancer earlier. ICAD also rates an F in Portfolio Grader’s specific subcategory of Equity. Shares of the stock are being traded at a very rapid pace, up 1306.4% from the week prior. For more information, get Portfolio Grader’s complete analysis of ICAD stock.

Computer Programs and Systems, Inc. (CPSI) earns a D this week, moving down from last week’s grade of C. Computer Programs and Systems is a healthcare information technology company that designs, develops, markets, installs, and supports computerized information technology systems for small and midsize hospitals. The stock gets F’s in Earnings Revisions and Earnings Surprise. As of Feb. 3, 2015, 11.7% of outstanding Computer Programs and Systems, Inc. shares were held short. Shares of the stock have been changing hands at an unusually rapid pace, four times the rate of the week prior. To get an in-depth look at CPSI, get Portfolio Grader’s complete analysis of CPSI stock.

athenahealth, Inc. (ATHN) experiences a ratings drop this week, going from last week’s C to a D. Athenahealth provides ongoing billing, clinical-related, and other related services to medical group practices primarily in the United States. The stock also gets an F in Earnings Growth. As of Feb. 3, 2015, 25.9% of outstanding athenahealth, Inc. shares were held short. For more information, get Portfolio Grader’s complete analysis of ATHN stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.