 Luminex NASDAQ:LMNX and Nephros OTCMKTS:NEPHD are both small-cap medical companies, but which is the better business? We will contrast the two companies based on the strength of their dividends, analyst recommendations, earnings, risk, institutional ownership, valuation and profitability. Profitability This table compares Luminex and Nephros net margins, return on equity and return on assets. Net ... 