• Quest Diagnostics average debt/equity ratio for 2023 was 0.64, a 0% increase from 2022.
• Quest Diagnostics average debt/equity ratio for 2022 was 0.64, a 1.59% decline from 2021.
• Quest Diagnostics average debt/equity ratio for 2021 was 0.63, a 3.08% increase from 2020.

Debt/equity ratio can be defined as a measure of a company's financial leverage calculated by dividing its long-term debt by stockholders' equity.