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”).

MedAssets, Inc.,’s (MDAS) rating falls to a D (“sell”) this week, down from C (“hold”) the week prior. MedAssets provides technology-enabled products and services for hospitals and health systems. In Portfolio Grader’s specific subcategories of Earnings Momentum and Earnings Revisions, MDAS also gets F’s. To get an in-depth look at MDAS, get Portfolio Grader’s complete analysis of MDAS stock.

Computer Programs and Systems, Inc. (CPSI) earns an F (“strong sell”) this week, moving down from last week’s grade of D (“sell”). 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 March 25, 2015, 17% of outstanding Computer Programs and Systems, Inc. shares were held short. For more information, get Portfolio Grader’s complete analysis of CPSI stock.

athenahealth, Inc.’s (ATHN) rating weakens this week, dropping to an F versus last week’s D. Athenahealth provides ongoing billing, clinical-related, and other related services to medical group practices primarily in the United States. The stock also rates an F in Margin Growth. As of March 25, 2015, 24.9% of outstanding athenahealth, Inc. shares were held short. To get an in-depth look at ATHN, 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.