DGX vs. RMD: Quest Diagnostics vs. ResMed Stock Comparison

November 11, 2026

How do Quest Diagnostics (DGX) and ResMed (RMD) stack up? This page sets them side by side across company profile, performance and risk, profitability, growth, financial strength, dividends, and valuation, with selected fundamentals also measured against each stock's industry-group peers.

Company Profile

Quest Diagnostics (DGX) and ResMed (RMD) both fall under the Health Care Equipment & Services industry group, but DGX is classified in Health Care Providers & Services while RMD is classified in Health Care Equipment & Supplies.

Company profile comparison for Quest Diagnostics (DGX) and ResMed (RMD)
Profile Item	DGX	RMD
Name	Quest Diagnostics Incorporated	ResMed Inc.
Country/Region	United States	United States
GICS Sector	Health Care	Health Care
GICS Industry Group	Health Care Equipment & Services	Health Care Equipment & Services
GICS Industry	Health Care Providers & Services	Health Care Equipment & Supplies
GICS Sub-Industry	Health Care Services	Health Care Equipment
Market Capitalization	28.21 billion USD	33.10 billion USD
Currency	USD	USD
Exchange	NYSE	NYSE
Listing Date	December 17, 1996	June 2, 1995
Security Type	Common Stock	Common Stock

Price Performance

Cumulative Growth

DGX

RMD

GSPC

Quest Diagnostics (DGX) vs. ResMed (RMD), with S&P 500 (GSPC) for reference: Growth of a $10,000 investment over the past five years. Adjusted for dividends and splits.

Trailing Returns

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Trailing total returns for Quest Diagnostics (DGX) and ResMed (RMD). Returns over one year are annualized.

Calendar-Year Returns

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Calendar-year total returns for Quest Diagnostics (DGX) and ResMed (RMD). Each bar is that year's total return, measured year-end to year-end.

Performance Metrics

Price performance metrics for Quest Diagnostics (DGX) and ResMed (RMD)
Metric	DGX	RMD
Total Return (1Y)	45.88%	-5.42%
Total Return (3Y, Annualized)	27.45%	18.99%
Total Return (5Y, Annualized)	14.84%	-1.23%

Risk Profile

Drawdown History

DGX

RMD

GSPC

Quest Diagnostics (DGX) vs. ResMed (RMD), with S&P 500 (GSPC) for reference: Drawdown from the running peak over the past five years. Each line shows the decline from its prior peak; 0% marks a new high.

Return Distribution

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Distribution of monthly total returns for Quest Diagnostics (DGX) and ResMed (RMD). Each bar is the share of months whose return fell in that 5% bucket.

Risk Metrics

Risk profile metrics for Quest Diagnostics (DGX) and ResMed (RMD)
Metric	DGX	RMD
Volatility (1Y, Annualized)	24.06%	30.80%
Beta (5Y)	0.54	0.75
Max Drawdown (5Y)	-28.62%	-49.04%
Avg. Volume (3M)	1.00M	1.32M

Risk-Adjusted Performance

Risk-Return Positioning

DGX and RMD are plotted by 1-year volatility (risk) and 1-year return. The dashed Capital Allocation Line runs from the risk-free rate through the shared industry median.

Risk-Adjusted Metrics

Risk-adjusted metrics for Quest Diagnostics (DGX) and ResMed (RMD)
Metric	DGX	RMD
Sharpe Ratio (1Y)	1.73	-0.31
Sortino Ratio (1Y)	3.16	-0.43

Profitability

ROE (TTM)

Both Quest Diagnostics (DGX) at 15.32% and ResMed (RMD) at 26.40% sit in the top peer quartile for ROE, suggesting each generates more profit from shareholders’ equity than typical industry peers.

DGX

Health Care Equipment & Services industry group

15.32%

Max: 47.61%
DGX: 15.32%
Q3: 14.36%
Median: 5.45%
Q1: -10.67%
Min: -47.01%

RMD

Health Care Equipment & Services industry group

26.40%

Max: 47.61%
RMD: 26.40%
Q3: 14.36%
Median: 5.45%
Q1: -10.67%
Min: -47.01%

Quest Diagnostics (DGX) vs. ResMed (RMD): A comparison of their ROE against the Health Care Equipment & Services industry group benchmark.

Net Margin (TTM)

For every dollar of sales, both Quest Diagnostics (DGX) at 9.54% and ResMed (RMD) at 27.79% retain more as net profit than most peers, landing in the top net margin quartile of their industries.

DGX

Health Care Equipment & Services industry group

9.54%

Max: 29.35%
DGX: 9.54%
Q3: 9.33%
Median: 2.18%
Q1: -6.29%
Min: -28.46%

RMD

Health Care Equipment & Services industry group

27.79%

Max: 29.35%
RMD: 27.79%
Q3: 9.33%
Median: 2.18%
Q1: -6.29%
Min: -28.46%

Quest Diagnostics (DGX) vs. ResMed (RMD): A comparison of their net margin against the Health Care Equipment & Services industry group benchmark.

Operating Margin (TTM)

Both Quest Diagnostics (DGX) at 15.63% and ResMed (RMD) at 34.82% convert sales into operating profit at a top-quartile rate, pointing to tighter cost discipline before financing and tax.

DGX

Health Care Equipment & Services industry group

15.63%

Max: 35.43%
DGX: 15.63%
Q3: 14.14%
Median: 6.81%
Q1: -0.28%
Min: -16.29%

RMD

Health Care Equipment & Services industry group

34.82%

Max: 35.43%
RMD: 34.82%
Q3: 14.14%
Median: 6.81%
Q1: -0.28%
Min: -16.29%

Quest Diagnostics (DGX) vs. ResMed (RMD): A comparison of their operating margin against the Health Care Equipment & Services industry group benchmark.

Profitability Metrics

Profitability metrics for Quest Diagnostics (DGX) and ResMed (RMD)
Metric	DGX	RMD
ROE (TTM)	15.32%	26.40%
ROA (TTM)	6.61%	14.76%
Net Margin (TTM)	9.54%	27.79%
Operating Margin (TTM)	15.63%	34.82%
Gross Margin (TTM)	33.18%	61.77%

Growth

Revenue Growth

Both Quest Diagnostics (DGX) at 11.78% and ResMed (RMD) at 9.85% land near their industries' usual revenue growth ranges, so top-line momentum looks broadly in line with peers on both sides.

Quest Diagnostics (DGX) vs. ResMed (RMD): A comparison of their Revenue Growth across different time periods.

EPS Growth

Only one side can be read here: Quest Diagnostics (DGX) reports EPS growth of 13.78%, ranked against its industry; ResMed (RMD) has no EPS growth figure this period.

Quest Diagnostics (DGX) vs. ResMed (RMD): A comparison of their EPS Growth across different time periods.

Growth Metrics

Growth metrics for Quest Diagnostics (DGX) and ResMed (RMD)
Metric	DGX	RMD
Revenue Growth (YoY)	11.78%	9.85%
Revenue Growth (3Y CAGR)	3.74%	10.21%
EPS Growth (YoY)	13.78%	--
EPS Growth (3Y CAGR)	3.16%	19.64%

Financial Strength

Current Ratio (MRQ)

Both Quest Diagnostics (DGX) at 1.70 and ResMed (RMD) at 2.65 carry current ratio within their industries’ typical mid-ranges, suggesting balanced short-term liquidity relative to peers.

DGX

Health Care Equipment & Services industry group

1.70

Max: 7.59
Q3: 4.00
Median: 1.98
DGX: 1.70
Q1: 1.37
Min: 0.30

RMD

Health Care Equipment & Services industry group

2.65

Max: 7.59
Q3: 4.00
RMD: 2.65
Median: 1.98
Q1: 1.37
Min: 0.30

Quest Diagnostics (DGX) vs. ResMed (RMD): A comparison of their current ratio against the Health Care Equipment & Services industry group benchmark.

Debt / Equity (MRQ)

ResMed (RMD) at 0.10 keeps leverage in the lower industry quartile, while Quest Diagnostics (DGX) at 0.80 runs a more typical debt-to-equity mix.

DGX

Health Care Equipment & Services industry group

0.80

Max: 1.88
Q3: 0.91
DGX: 0.80
Median: 0.58
Q1: 0.16
Min: 0.00

RMD

Health Care Equipment & Services industry group

0.10

Max: 1.88
Q3: 0.91
Median: 0.58
Q1: 0.16
RMD: 0.10
Min: 0.00

Quest Diagnostics (DGX) vs. ResMed (RMD): A comparison of their debt-to-equity ratio against the Health Care Equipment & Services industry group benchmark.

Financial Strength Metrics

Financial strength metrics for Quest Diagnostics (DGX) and ResMed (RMD)
Metric	DGX	RMD
Current Ratio (MRQ)	1.70	2.65
Debt / Equity (MRQ)	0.80	0.10
Net Debt / EBITDA	2.38	-0.19

Dividends

Dividend Yield (TTM)

Both Quest Diagnostics (DGX) at 1.33% and ResMed (RMD) at 1.03% yield above their industries’ entire benchmark ranges — high enough that dividend safety, not income, becomes the first question.

DGX

Health Care Equipment & Services industry group

1.33%

DGX: 1.33%
Max: 0.00%
Q3: 0.00%
Median: 0.00%
Q1: 0.00%
Min: 0.00%

RMD

Health Care Equipment & Services industry group

1.03%

RMD: 1.03%
Max: 0.00%
Q3: 0.00%
Median: 0.00%
Q1: 0.00%
Min: 0.00%

Quest Diagnostics (DGX) vs. ResMed (RMD): A comparison of their dividend yield against the Health Care Equipment & Services industry group benchmark.

Dividend Payout Ratio (TTM)

Both Quest Diagnostics (DGX) at 25.10% and ResMed (RMD) at 22.40% pay out more of their earnings than any of their industry peers — the thinnest cover in their groups, so dividend headroom deserves attention.

DGX

Health Care Equipment & Services industry group

25.10%

DGX: 25.10%
Max: 0.00%
Q3: 0.00%
Median: 0.00%
Q1: 0.00%
Min: 0.00%

RMD

Health Care Equipment & Services industry group

22.40%

RMD: 22.40%
Max: 0.00%
Q3: 0.00%
Median: 0.00%
Q1: 0.00%
Min: 0.00%

Quest Diagnostics (DGX) vs. ResMed (RMD): A comparison of their payout ratio against the Health Care Equipment & Services industry group benchmark.

Dividend Metrics

Dividend metrics for Quest Diagnostics (DGX) and ResMed (RMD)
Metric	DGX	RMD
Dividend Yield (TTM)	1.33%	1.03%
Dividend Payout Ratio (TTM)	25.10%	22.40%

Valuation

P/E Ratio (TTM)

Both Quest Diagnostics (DGX) at 25.46 and ResMed (RMD) at 21.43 land around their industries’ usual P/E ratio levels — neither is getting a clear earnings-multiple discount or premium versus peers.

DGX

Health Care Equipment & Services industry group

25.46

Max: 80.41
Q3: 47.62
Median: 29.93
DGX: 25.46
Q1: 21.19
Min: 4.21

RMD

Health Care Equipment & Services industry group

21.43

Max: 80.41
Q3: 47.62
Median: 29.93
RMD: 21.43
Q1: 21.19
Min: 4.21

Quest Diagnostics (DGX) vs. ResMed (RMD): A comparison of their P/E ratio against the Health Care Equipment & Services industry group benchmark.

P/S Ratio (TTM)

Quest Diagnostics (DGX) at 2.38 is priced about in line with its industry on P/S ratio, while ResMed (RMD) at 5.77 sits in the pricier quartile — RMD costs more per dollar of sales.

DGX

Health Care Equipment & Services industry group

2.38

Max: 8.80
Q3: 4.32
DGX: 2.38
Median: 2.13
Q1: 1.10
Min: 0.03

RMD

Health Care Equipment & Services industry group

5.77

Max: 8.80
RMD: 5.77
Q3: 4.32
Median: 2.13
Q1: 1.10
Min: 0.03

Quest Diagnostics (DGX) vs. ResMed (RMD): A comparison of their P/S ratio against the Health Care Equipment & Services industry group benchmark.

P/B Ratio (MRQ)

On P/B ratio, both Quest Diagnostics (DGX) at 3.68 and ResMed (RMD) at 5.56 are valued close to their industries’ norm against book — neither stands out from peers.

DGX

Health Care Equipment & Services industry group

3.68

Max: 11.68
Q3: 6.12
DGX: 3.68
Median: 3.00
Q1: 1.73
Min: -1.31

RMD

Health Care Equipment & Services industry group

5.56

Max: 11.68
Q3: 6.12
RMD: 5.56
Median: 3.00
Q1: 1.73
Min: -1.31

Quest Diagnostics (DGX) vs. ResMed (RMD): A comparison of their P/B ratio against the Health Care Equipment & Services industry group benchmark.

Valuation Metrics

Valuation metrics for Quest Diagnostics (DGX) and ResMed (RMD)
Metric	DGX	RMD
P/E Ratio (TTM)	25.46	21.43
P/S Ratio (TTM)	2.38	5.77
P/B Ratio (MRQ)	3.68	5.56
Free Cash Flow Yield (TTM)	3.09%	3.92%