The ratings of three Health Care Provider stocks are down this week, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Cross Country Healthcare’s (NASDAQ:CCRN) rating falls this week to an F (“strong sell”), down from last week’s D (“sell”). Cross Country Healthcare provides healthcare staffing and outsourcing services to the healthcare market. In Portfolio Grader’s specific subcategories of Earnings Growth, Earnings Momentum, Earnings Revisions, and Cash Flow, CCRN also gets F’s. For more information, get Portfolio Grader’s complete analysis of CCRN stock.

This week, Quest Diagnostics (NYSE:DGX) falls to a D (“sell”), worse than last week’s grade of C (“hold”). Quest Diagnostics provides diagnostic testing, information, and services. The stock also gets an F in Earnings Momentum. To get an in-depth look at DGX, get Portfolio Grader’s complete analysis of DGX stock.

VCA Antech (NASDAQ:WOOF) earns a D this week, falling from last week’s grade of C. VCA Antech is an animal healthcare company that provides veterinary services, diagnostic testing and medical technology products and services to the veterinary market. For a full analysis of WOOF stock, visit Portfolio Grader.

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.