In 2025, Quest Diagnostics completed a corporate carbon footprint assessment and publicly disclosed its greenhouse gas (GHG) emissions according to the GHG Protocol, covering Scope 1 (direct emissions from owned or controlled sources), Scope 2 (indirect emissions from purchased energy) and Scope 3 (indirect emissions across the value chain).
Quest Diagnostics has also provided a category-level breakdown for 6 out of 15 Scope 3 emissions categories, offering greater transparency into its value chain emissions.
| Metric (tCO2e) | 2025 | 2024 | 2023 | 2022-2019 |
|---|---|---|---|---|
Total Scope 1 | 110,180a | 111,724b | N/A | |
Total Scope 2 | ||||
Market-Based | 75,790a | 72,820b | N/A | |
Location-Based | 84,722a | 82,977b | N/A | |
Total Scope 3 | 657,882a | 567,329b | N/A | |
Total Scope 1 Revenue Intensity (tCO2e/$M) | 9.9846a | 11.3173b | N/A |
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In 2025, the total operational greenhouse gas (GHG) emissions of Quest Diagnostics amounted to 194,902 metric tons of CO2 equivalent. This figure includes both direct emissions from owned or controlled sources (Scope 1) and indirect emissions from purchased energy (Scope 2).a
Compared to 2024, the total operational greenhouse gas (GHG) emissions of Quest Diagnostics increased by 0.1%, suggesting that the company faced challenges in reducing its emissions from its core operations.ab
In 2025, the total Scope 1 emissions of Quest Diagnostics were 110,180 metric tons of CO₂ equivalent (tCO₂e).a
Since 2021, Quest Diagnostics's Scope 1 emissions have decreased by 53.88%, reflecting a declining long-term trend in Scope 1 emissions over time.ac
Compared to the previous year (2024), Quest Diagnostics's Scope 1 emissions decreased by 1.38%, highlighting the company's efforts to lower direct emissions from assets it owns or controls.ab
In 2025, Quest Diagnostics reported Scope 2 greenhouse gas (GHG) emissions of 75,790 tCO₂e using the market-based method and 84,722 tCO₂e using the location-based method.a
Since 2021, Quest Diagnostics's Scope 2 greenhouse gas (GHG) emissions (Location-Based) have decreased by 20.25%, reflecting a declining long-term trend in Scope 2 emissions over time.ac
Compared to the previous year (2024), Quest Diagnostics's Scope 2 emissions (Location-Based) have remained relatively stable, indicating that Quest Diagnostics's emissions have plateaued with no significant change in its energy consumption footprint.ab
In 2025, Quest Diagnostics reported its Scope 2 emissions using the market-based method and using the location-based method.a
In 2025, Quest Diagnostics reported 657,882 metric tons of CO₂ equivalent (tCO₂e) of Scope 3 greenhouse gas (GHG) emissions, representing indirect emissions across its upstream and downstream value chain.a
The 2025 disclosure of Quest Diagnostics includes a breakdown across 6 of the 15 Scope 3 categories defined by the GHG Protocol, matching the level of disclosure in 2024, demonstrating consistent Scope 3 emissions reporting coverage year over year.a
In 2025, Quest Diagnostics reported total Scope 3 emissions of 657,882 metric tons of CO₂ equivalent (tCO₂e).a
Approximately 100% of these emissions originated from upstream activities such as purchased goods and capital goods, while 0% came from downstream activities like product use, distribution, and end-of-life treatment.a
Since 2021, Quest Diagnostics's Scope 3 emissions have decreased by 97.35%, reflecting a declining long-term trend in Scope 3 emissions over time.ac
Compared to the previous year (2024), Quest Diagnostics's Scope 3 emissions increased by 15.96%, suggesting that the company faced challenges in reducing emissions across its value chain.ab
In 2025, Quest Diagnostics reported emissions for 6 out of the 15 Scope 3 categories defined by the GHG Protocol.a
This partial disclosure allows for some insight into the company's indirect impacts.
In 2025, the largest contributors to Quest Diagnostics's Scope 3 emissions were:a
In 2025, Quest Diagnostics reported Scope 1 greenhouse gas (GHG) emissions of 110,180 tCO₂e and total revenues of USD 11,035 millions. This translates into an emissions intensity of 9.98 tCO₂e per millions USD.a
In 2025, Quest Diagnostics reported a Scope 1 emissions intensity of 9.98 tCO₂e per millions USD. Compared to the peer group median of 4.56, this places the company above its industry benchmark, indicating it is less carbon-efficient than most competitors.a
In 2025, Quest Diagnostics ranked 20 out of 24 companies in its industry peer group, based on Scope 1 emissions intensity (measured in tCO₂e per millions USD).a
This places Quest Diagnostics among the least efficient performers, with one of the highest emissions intensities in its sector.a
In 2025, Quest Diagnostics reported a total carbon footprint of 852,784 metric tons of CO₂ equivalent (tCO₂e) across Scope 1, Scope 2, and Scope 3 emissions. This represents a 11.91% increase compared to 2024, suggesting a rise in emissions across its operations or value chain.ab
The largest contributor to Quest Diagnostics's total carbon footprint was Scope 3 emissions, accounting for 77.15% of the company's total carbon footprint, followed by Scope 1 emissions at 12.92%.a