The overall ratings of 6 Health Care Equipment & Supplies stocks are down on Portfolio Grader this week. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This week, LDR Holding Corporation (LDRH) drops from a C to a D rating. The company also gets F’s in earnings surprise and earnings momentum. For more information, get Portfolio Grader’s complete analysis of LDRH stock.

AngioDynamics, Inc. (ANGO) experiences a ratings drop this week, going from last week’s D to a F. AngioDynamics, Inc. is a developer and manufacturer of gastrointestinal contrast agents and related imaging accessories. The company also gets F’s in operating margin growth and earnings growth. For more information, get Portfolio Grader’s complete analysis of ANGO stock.

Novadaq Technologies Inc. (NVDQ) gets weaker ratings this week as last week’s C drops to a D. Novadaq Technologies Inc. develops and commercializes medical devices based on its proprietary imaging platform for the diagnosis and treatment of human vascular and opthalmic diseases and conditions. The company also gets F’s in earnings growth, earnings surprise, and return on equity. For more information, get Portfolio Grader’s complete analysis of NVDQ stock.

Mazor Robotics Ltd Sponsored ADR (MZOR) earns a D this week, moving down from last week’s grade of C. The company also gets F’s in return on equity. For more information, get Portfolio Grader’s complete analysis of MZOR stock.

This is a rough week for CryoPort, Inc. (CYRX). The company’s rating falls to D from the previous week’s C. The company also gets F’s in earnings revisions, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of CYRX stock.

ERBA Diagnostics, Inc. (ERB) declines this week from a D to a F. The company also gets F’s in sales growth, operating margin growth, earnings growth, and return on equity. For more information, get Portfolio Grader’s complete analysis of ERB 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.