Function Health vs Quest Diagnostics:Which is more popular?
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%. When we asked ChatGPT and Google AI Overviews about online blood testing services, Function Health and Quest Diagnostics each appeared in two of the five answers. Function Health was mentioned before Quest Diagnostics in two out of three answers that named either.
Who do people search for more?
Function Health, about 20 searches for every 1 for Quest Diagnostics
Who does AI mention more?
Both were mentioned in 2 of 5 answers.
Who does AI recommend more?
Function Health, named ahead of Quest Diagnostics in 2 of 3 answers
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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.
Most recommended by AI
Brands get a higher ranking if they are mentioned earlier in the answers.
Mentioned by AI
Each dot is one answer, filled in when that answer mentions the brand.
Labcorp4 of 5Named in 2 of 3 ChatGPT answersNamed in 2 of 2 Google answers- Function Health2 of 5Named in 2 of 3 ChatGPT answersNamed in 0 of 2 Google answers
Quest Diagnostics2 of 5Named in 1 of 3 ChatGPT answersNamed in 1 of 2 Google answers
Everlywell1 of 5Named in 0 of 3 ChatGPT answersNamed in 1 of 2 Google answers
LetsGetChecked1 of 5Named in 1 of 3 ChatGPT answersNamed in 0 of 2 Google answers
Ulta Lab Tests1 of 5Named in 1 of 3 ChatGPT answersNamed in 0 of 2 Google answers
SiPhox Health1 of 5Named in 1 of 3 ChatGPT answersNamed in 0 of 2 Google answers
Superpower1 of 5Named in 1 of 3 ChatGPT answersNamed in 0 of 2 Google answers
Medichecks0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
Marek Health0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
See every answer about online blood testing services
5 answers
Asked ChatGPT
“Which online blood test service should I use?”
Asked ChatGPT
“What are the best services for ordering your own blood tests?”
Asked ChatGPT
“What's the best at-home blood test for checking my overall health?”
Searched Google, AI Overview
“at home blood test”
Searched Google, AI Overview
“order blood test online”
Not named in any answer:
Brands are shown in the order each answer named them. The survey took place in the United States on October 25, 2026.
Is Function Health or Quest Diagnostics more popular in search?
This chart shows how often people search Google for Function Health and Quest Diagnostics by name. Each line represents a brand's share of searches for all 12 online blood testing services we track, month by month, from English-language searches worldwide.
Share of searches by month for Function Health, Quest Diagnostics. The figures are in the table below the chart.
View monthly share of searches table
| Month | Function Health | Everlywell | Medichecks | Labcorp | Marek Health | Quest Diagnostics | LetsGetChecked | Thriva | Ulta Lab Tests | SiPhox Health | InsideTracker | Superpower |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nov 2025 | 53.1% | 10.7% | 10.7% | 7.2% | 3.9% | 2.1% | 2.6% | 3.9% | 1.4% | 0.5% | 2.6% | 1.2% |
| Dec 2025 | 52.8% | 10.6% | 8.7% | 10.6% | 3.9% | 2.1% | 2.1% | 3.2% | 1.7% | 0.5% | 2.6% | 1.2% |
| Jan 2026 | 46.7% | 9.4% | 11.5% | 14.1% | 3.4% | 2.3% | 2.3% | 4.2% | 2.3% | 0.67% | 1.9% | 1.3% |
| Feb 2026 | 54.2% | 8.9% | 10.9% | 7.3% | 4% | 2.2% | 2.2% | 4% | 2.7% | 0.65% | 1.8% | 1.2% |
| Mar 2026 | 56.2% | 9.2% | 9.2% | 7.6% | 3.4% | 2.3% | 1.8% | 4.1% | 2.3% | 0.82% | 1.8% | 1.2% |
| Apr 2026 | 51.6% | 10.4% | 10.4% | 8.5% | 3.8% | 2.5% | 2.1% | 3.8% | 2.5% | 0.92% | 2.1% | 1.4% |
| May 2026 | 54% | 8.9% | 10.9% | 7.3% | 4% | 2.7% | 2.2% | 4% | 2.2% | 0.78% | 1.8% | 1.5% |
| Jun 2026 | 54.2% | 8.9% | 10.9% | 6% | 4% | 2.7% | 2.2% | 4% | 2.7% | 0.97% | 1.8% | 1.8% |
| Jul 2026 | 54.8% | 9% | 11.1% | 6.1% | 4% | 2.7% | 2.2% | 3.3% | 2.7% | 0.79% | 1.5% | 1.8% |
| Aug 2026 | 52% | 8.6% | 10.5% | 10.5% | 3.8% | 3.1% | 2.1% | 3.1% | 2.1% | 1.1% | 1.4% | 1.7% |
| Sep 2026 | 49.4% | 12.1% | 12.1% | 6.6% | 3.6% | 3% | 3% | 3% | 2.4% | 1.6% | 1.6% | 1.6% |
| Oct 2026 | 55% | 13.6% | 9.1% | 6.1% | 2.7% | 2.7% | 2.2% | 2.2% | 2.2% | 1.8% | 1.2% | 1.2% |
How has branded search for Function Health and Quest Diagnostics changed worldwide over the last 12 months?
3 findings
- 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.
How did search popularity change for online blood testing services worldwide in October 2026?
2 changes
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 are Function Health’s and Quest Diagnostics’ branded searches counted?
2 search terms
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
1 branded search term
- function health
Quest Diagnostics
1 branded search term
- quest health
Other head-to-heads among online blood testing services
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