QUEST DIAGNOSTICS INC vs RadNet, Inc., two Medical Diagnostics stocks. A side-by-side on valuation, growth, margins, returns, and what each price is betting.
Nothing on this page states growth directly, so the structures speak: Quest grows the way utilities do, more tests through a national lab network at a 13.8% operating margin, while RadNet grows by opening imaging centers, an expansion currently running at a small net loss (negative 0.7%) on 0.82 turns of debt. Quest trades at 23.2 times earnings with a 5.6% free-cash yield and a dividend; RadNet has no multiple to quote, though its 7.2% free-cash yield shows depreciation-heavy accounting returning cash the income statement hides. Returns on assets, 6.1% against negative 0.4%, complete the maturity gap. One page prices a finished machine, the other a buildout that has yet to pay for itself.
Comparison updated 2026-07-10.
| Metric | DGX | RDNT |
|---|---|---|
| Price | $209.79 | $60.71 |
| Market cap | $23.5B | $4.7B |
| Sector | Medical Diagnostics | Medical Diagnostics |
| Stage | Mature | Growth |
| Implied growth (priced in) | -3.3% | — |
| P/E | 23.2 | — |
| P/B | 3.07 | 3.46 |
| P/S | 2.08 | 2.18 |
| EV/EBITDA | 10.8 | 23.8 |
| Revenue growth | +11.2% | +14.7% |
| Operating margin | 13.8% | -4.2% |
| Net margin | 9.1% | -0.7% |
| Return on equity | 13.4% | -1.1% |
| Return on assets | 6.1% | -0.4% |
| Return on invested capital | 15.6% | 2.0% |
| FCF yield | 5.6% | 7.2% |
| Dividend yield | 0.9% | — |
| Debt / equity | 0.07 | 0.82 |
| Current ratio | 1.18 | 1.17 |
| Altman Z (solvency) | 7.64 | 1.63 |
| Piotroski F (quality) | 8 / 9 | 6 / 9 |
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The stronger value is highlighted per metric where one is strictly better on that single number; it is not an overall verdict on either company. For informational and research purposes only. Not investment advice. Not a recommendation to buy, sell, or hold any security. boothcheck is not a registered investment adviser. Past performance does not guarantee future results.