Is Quest Diagnostics (DGX) stock Halal?

Quest Diagnostics is a leading healthcare company specializing in diagnostic information services, with a significant presence in the global diagnostics and research sector. The company provides laboratory testing services that are crucial for medical decision-making, serving physicians, hospitals, and patients. Quest Diagnostics processes one of the largest databases of de-identified clinical lab results worldwide, enabling it to deliver actionable diagnostic insights that support disease detection, treatment management, and overall healthcare quality. Before any of that matters to a Muslim investor, one question comes first: is Quest Diagnostics stock Halal?

Is Quest Diagnostics Shariah compliant?

Yes. In the October 2026 screening Quest Diagnostics (DGX) passes AAOIFI Shariah Standard No. 21: the business activity screen and every financial ratio screen hold. Healthcare rarely troubles the activity screen; treating illness is permissible work. For Quest Diagnostics, the AAOIFI Shariah Standard No. 21 verdict turns on the balance sheet instead: research is capital hungry, and interest bearing debt and investments must each stay below 30% of market capitalisation.

Does Quest Diagnostics pass the business activity test?

Yes. In the October 2026 screening Quest Diagnostics holds an overall PASS, which a stock only earns when its core business clears the activity screen. Treating illness is permissible work; the scrutiny belongs to the financing behind it.

Is Quest Diagnostics' income Halal?

Yes, within AAOIFI's tolerance. Quest Diagnostics' income from non-permissible sources stays below 5% of revenue in the October 2026 screening, and the small impure portion is handled through purification: the factor of 99.84% tells holders of DGX what share of each dividend to keep and what remainder to donate to charity. On a dividend yield of around 1.42%, the purification amount is modest but real.

Does Quest Diagnostics meet AAOIFI's debt and investment ratio requirements?

Yes. Both caps hold this month: interest bearing investments and interest bearing debt each stay below 30% of market capitalisation, measured against a market capitalisation of $25.7B (market data as of 1 October 2026). Because the caps move with the share price, our Shariah Supervisory Board has DGX re-screened every month, and the result above always shows the latest verdict.

Why do other halal screeners show a different verdict for Quest Diagnostics?

Screeners can disagree without either being wrong. AAOIFI Shariah Standard No. 21, which Tabadulat applies, measures interest bearing debt and investments against market capitalisation with a 30% ceiling. MSCI and FTSE measure them against total assets with a 33% ceiling, and S&P and Dow Jones Islamic use a multi year average of market capitalisation. Data dates differ too, because each provider reads filings and prices on its own schedule. The same company can therefore pass one standard and fail another in the same month. Tabadulat publishes one answer, the AAOIFI result as of October 2026, and re-screens it every month.

Tabadulat is an ADGM regulated brokerage whose license covers Shari'a Compliant Regulated Activities, as the FSRA permission names them. New to the terminology? Gharar and Maysir, Sukuk, Zakat and purification are all explained in plain English.

New to the screening method? Read What is Halal Investing? A Guide to Halal Stocks and Islamic Finance