--- title: "Function Health vs Quest Diagnostics: Which is more popular?" description: "Is Function Health or Quest Diagnostics more popular in search? Compare estimated monthly branded-search demand and Share of Search inside the Online blood testing services set worldwide. Branded searches tell you how often people look for a brand by name or related terms. Comparing these searches across competitors helps you see how popular each brand is over time." canonical: "https://gobrandwave.com/demand/global-en/compare/function-health-vs-quest-diagnostics" publisher: "Brandwave" --- # Function Health vs Quest Diagnostics: Which is more popular? Is Function Health or Quest Diagnostics more popular in search? Compare estimated monthly branded-search demand and Share of Search inside the Online blood testing services set worldwide. Branded searches tell you how often people look for a brand by name or related terms. Comparing these searches across competitors helps you see how popular each brand is over time. ## Key facts - **Compared**: Function Health and Quest Diagnostics - **Competitive set**: Online blood testing services - **Market**: Global - **Month measured**: Oct 2026 - **Function Health Share of Search**: 55% - **Quest Diagnostics Share of Search**: 2.7% ## Is Function Health or Quest Diagnostics more popular in search? - In October 2026, Function Health had more branded searches than Quest Diagnostics among online blood testing services worldwide. Function Health had about 201,000 branded searches, while Quest Diagnostics had 9,900. Function Health made up 55% of all online blood testing service searches we track, and Quest Diagnostics accounted for 2.7%. - Function Health was ahead of Quest Diagnostics in every measured month of the 12 months ending October 2026. - Across the 12 months ending October 2026, Function Health’s share of searches among online blood testing services worldwide moved from 53.1% to 55%, and its estimated monthly branded searches held steady at 201K. - Across the 12 months ending October 2026, Quest Diagnostics’ share of searches among online blood testing services worldwide moved from 2.1% to 2.7%, and its estimated monthly branded searches moved from 8.1K to 9.9K. ## Top online blood testing services in ChatGPT and Google AI Overviews In three ChatGPT questions and two Google AI Overviews, Function Health was mentioned in two out of five: in two of the three ChatGPT answers, but not in either of the two Google AI Overviews. Quest Diagnostics was mentioned in two out of five: in one of the three ChatGPT answers and in one of the two Google AI Overviews. Function Health was listed before Quest Diagnostics in two out of three answers that named either. Brands get a higher AI rank if they are mentioned earlier in the answers that list options. | Brand | AI rank | ChatGPT answers that named it | Google AI Overviews that named it | All answers that named it | | --- | --- | --- | --- | --- | | Labcorp | 1st | 2 of 3 | 2 of 2 | 4 of 5 | | Function Health | 2nd | 2 of 3 | 0 of 2 | 2 of 5 | | SiPhox Health | 2nd | 1 of 3 | 0 of 2 | 1 of 5 | | Quest Diagnostics | 4th | 1 of 3 | 1 of 2 | 2 of 5 | | Ulta Lab Tests | 4th | 1 of 3 | 0 of 2 | 1 of 5 | | Superpower | 6th | 1 of 3 | 0 of 2 | 1 of 5 | | Everlywell | 7th | 0 of 3 | 1 of 2 | 1 of 5 | | LetsGetChecked | 8th | 1 of 3 | 0 of 2 | 1 of 5 | | Medichecks | Not ranked | 0 of 3 | 0 of 2 | 0 of 5 | | Marek Health | Not ranked | 0 of 3 | 0 of 2 | 0 of 5 | | Thriva | Not ranked | 0 of 3 | 0 of 2 | 0 of 5 | | InsideTracker | Not ranked | 0 of 3 | 0 of 2 | 0 of 5 | ## Every AI answer about online blood testing services - Asked ChatGPT "Which online blood test service should I use?": 1. Labcorp, 2. Function Health - Asked ChatGPT "What are the best services for ordering your own blood tests?": 1. Labcorp, 2. Ulta Lab Tests, 3. Function Health, 4. Quest Diagnostics - Asked ChatGPT "What's the best at-home blood test for checking my overall health?": 1. SiPhox Health, 2. Superpower, 3. LetsGetChecked - Searched Google, AI Overview "at home blood test": 1. Labcorp, 2. Everlywell - Searched Google, AI Overview "order blood test online": 1. Labcorp, 2. Quest Diagnostics Not named in any answer: Medichecks, Marek Health, Thriva and InsideTracker. Brands are listed in the order each answer named them. The answers were collected in the United States on October 25, 2026. ## How did search popularity change for online blood testing services worldwide in October 2026? - In October 2026, Function Health gained share of searches among online blood testing services worldwide, from 49.4% to 55%. - In October 2026, Quest Diagnostics rose from 7th to 6th among online blood testing services worldwide. ## How has branded search for Function Health and Quest Diagnostics changed worldwide over the last 12 months? | Month | Function Health estimated searches | Function Health Share of Search | Function Health rank | Quest Diagnostics estimated searches | Quest Diagnostics Share of Search | Quest Diagnostics rank | | --- | --- | --- | --- | --- | --- | --- | | Nov 2025 | 201K | 53.1% | 1 | 8.1K | 2.1% | 9 | | Dec 2025 | 201K | 52.8% | 1 | 8.1K | 2.1% | 9 | | Jan 2026 | 201K | 46.7% | 1 | 9.9K | 2.3% | 8 | | Feb 2026 | 201K | 54.2% | 1 | 8.1K | 2.2% | 9 | | Mar 2026 | 246K | 56.2% | 1 | 9.9K | 2.3% | 7 | | Apr 2026 | 201K | 51.6% | 1 | 9.9K | 2.5% | 7 | | May 2026 | 201K | 54% | 1 | 9.9K | 2.7% | 7 | | Jun 2026 | 201K | 54.2% | 1 | 9.9K | 2.7% | 7 | | Jul 2026 | 201K | 54.8% | 1 | 9.9K | 2.7% | 7 | | Aug 2026 | 201K | 52% | 1 | 12.1K | 3.1% | 6 | | Sep 2026 | 165K | 49.4% | 1 | 9.9K | 3% | 7 | | Oct 2026 | 201K | 55% | 1 | 9.9K | 2.7% | 6 | ## How are Function Health’s and Quest Diagnostics’ branded searches counted? Brandwave collects information about searches that people make online using Function Health’s and Quest Diagnostics’ names. When viewed over time, estimated search volumes for these branded terms can be used to understand whether interest in the brands is growing, holding steady, or fading. - **Function Health**: Measured on the search term “function health”. - **Quest Diagnostics**: Measured on the search term “quest health”. - [Function Health profile](/demand/global-en/brands/function-health) - [Quest Diagnostics profile](/demand/global-en/brands/quest-diagnostics) - [All online blood testing services worldwide](/demand/global-en/categories/online-blood-test-services): The set both shares are measured inside, 12 brands. ## Methodology - [How is the Brand Demand Index measured?](/demand/methodology): Where the figures come from, what they compare, and how they may be reused. ## Frequently asked questions ### Is Function Health or Quest Diagnostics more popular in search? In October 2026, Function Health had more branded searches than Quest Diagnostics among online blood testing services worldwide. Function Health had about 201,000 branded searches, while Quest Diagnostics had 9,900. Function Health made up 55% of all online blood testing service searches we track, and Quest Diagnostics accounted for 2.7%. ## Cite this page Brandwave. "Function Health vs Quest Diagnostics: Which is more popular?". https://gobrandwave.com/demand/global-en/compare/function-health-vs-quest-diagnostics This page is also available as HTML at https://gobrandwave.com/demand/global-en/compare/function-health-vs-quest-diagnostics. Brandwave publishes an index of its Markdown pages at https://gobrandwave.com/llms.txt.