Like the colors and the grading. Like the emblem because it makes me think of a partnership between our company and our customer. Should have said that these diagnostic products are more likely to be in the molecular diagnostics realm rather than other areas of medical diagnostics (radiology, etc) This particular image looks like a heart tracing to me, and Custom Diagnostics won't be in that space.
Latest design appears heart-shaped to me which would be more emotion than the company would want to convey for a business-to-business relationship in the medical field