VialTests may use cookies or similar technologies that are necessary for website functionality, security, session management, fraud prevention, preferences, or other legitimate operational purposes. In current production, this includes cookies used to support authorized guest order access, optional customer portal sessions, and Affiliate Program referral attribution (a signed referral cookie that may persist for up to thirty days when a visitor uses a valid referral link).
When advertising measurement is enabled by configuration, VialTests may also store a first-party marketing-consent preference cookie that records only whether Meta advertising measurement was previously allowed or refused (for example, granted or denied). That preference does not store your name, email address, phone number, or order details.
VialTests provides a compact Cookie Preferences notice on public website pages and a Cookie Preferences control in the website footer. You may Accept All, Reject All, customize optional categories, or dismiss the notice without choosing. Closing the notice without choosing does not record affirmative consent. Additional detail is in our Cookie Policy.
VialTests may use first-party website analytics provided by its hosting platform to understand aggregate site reliability and traffic. Separately, a Meta Pixel may load only when a stored affirmative marketing-measurement preference is present, and only on selected public marketing pages. Visitors without a stored affirmative preference are not measured by the Meta Pixel. The Pixel is not loaded on checkout, payment, private order, Client Portal, Affiliate Portal, laboratory, internal administrative, or Certificate of Analysis verification pages.
VialTests applies a site-wide Referrer-Policy of no-referrer so that sensitive page addresses and query parameters (for example, checkout URLs that include analyte selections) are not forwarded as browser referrer information when you navigate to another page. The Meta Pixel integration also refuses to emit measurement events when the current page address, document referrer, or document title appears to contain sensitive context.
If you previously allowed marketing measurement and want to withdraw that preference, use Cookie Preferences (footer), clear the VialTests marketing-consent cookie for this site, or contact us using the details in this Policy. While the preference is absent or denied, VialTests does not initialize or emit further Meta Pixel events, and where withdrawal is recorded as denied VialTests attempts to clear first-party Meta cookies set on vialtests.com (such as _fbp). Withdrawal does not unload a third-party script that may already be in browser memory, does not delete cookies controlled solely by Meta on Meta-owned domains, and does not recall or delete events Meta has already received.
Meta Pixel measurement remains inactive until VialTests enables it by configuration after owner approval, and even when enabled it remains gated on a stored affirmative preference. VialTests does not fabricate consent or treat silence as permission to measure.