# Spot Dx vs Karpa: White Label Lab Testing Comparison (2026)

**Author:** Chad H., Co-founder, Karpa Health  
**Last reviewed:** November 9, 2026

Spot Dx is a Y Combinator-backed company that fulfils white label at-home blood, urine and saliva tests for health brands. Its physician network handles the doctor's order, partner labs run the samples, and the brand sells the kits through its own Shopify, WooCommerce, Wix or Squarespace store or app, paying Spot on usage with no upfront cost.

## Side by side
| Question | Karpa Health | Spot Dx |
| --- | --- | --- |
| What it is | White label lab testing, sold through Karpa's storefront, your own website or the API, with prescription programs on the same platform | At-home diagnostics as a service: white label mail-in blood, urine and saliva kits plus an ordering and results API for health brands, which sell the tests through their own online store or app. |
| Built for | Businesses without a medical license and clinicians: gyms, trainers, coaches, med spas, chiropractors, supplement brands, creators and telehealth brands | Health brands and digital health companies, including telehealth platforms, personalized product companies (supplements, fitness programs, meal plans) and brands running efficacy studies. |
| Who orders the test | A licensed provider in Karpa's independent network orders every test, so the business needs no medical license | Spot's own physician network, which Spot says is licensed in all 50 states, handles the doctor's order where a state requires one. |
| Sample collection | Walk-in or booked draw at a Labcorp patient service center; branded at-home kits, including white-labeled Tasso devices above a minimum order quantity, launch December 1, 2026 | At-home only: blood, urine or saliva collection kits shipped to the user and mailed back to a partner lab in a prepaid mailer. Spot reissues kits and gives live phone support when a user has trouble collecting. No lab draw-site option is described. |
| Lab that runs the tests | Labcorp | A network of partner labs that Spot matches to each panel; the labs are not named publicly. |
| Pricing | Labs-only storefront pricing is shared on a call, and each lab order carries a $6 collection fee; prescription programs start at $297/month plus a one-time implementation fee | Not publicly listed; Spot states no upfront costs and simple, usage-based pricing. |
| How customer payments flow | Customers pay at the branded storefront checkout Karpa supplies, at the price the business sets, and funds settle directly to the business's own Stripe account | Customers pay on the business's own Shopify, WooCommerce, Wix or Squarespace store at the business's price; the paid order reaches Spot by webhook or API, Spot ships the kit, and Spot bills the business on usage. |
| Coverage | 47 states plus Washington DC (not Hawaii, Maine or North Dakota, where Labcorp has no patient service center) | Not publicly specified as a state list; Spot says its physician network is licensed in all 50 states. |
| Add prescription programs | Yes: TRT, HRT, GLP-1 weight loss and peptide programs under the same brand, from $297/month plus a one-time implementation fee | Not offered; Spot does not describe prescription telehealth programs or consults a business can add. |
| Sold under your brand (white label) | Yes | Yes |
| Branded storefront and checkout included | Yes | No |
| You set the retail price | Yes | Yes |
| Payments settle to your account | Yes | Yes |

## Spot Dx: what you should know
Spot Dx fits a business that already sells online through Shopify, WooCommerce, Wix or Squarespace, or through its own app, and wants at-home test kits to plug into that existing checkout. Spot supplies branded kits, the physician order, lab routing, results by API or branded portal, and patient support, and it bills the business per use with no upfront cost. It also suits brands that need urine or saliva tests, or a custom test Spot builds on request, and it ships at-home kits today.
Karpa fits a business that does not have a store to plug into and wants the storefront supplied: a ready-made lab storefront under its brand, with payments settling to its own Stripe account at prices it sets. A licensed provider in Karpa's network orders each test, and Labcorp runs it at a patient service center draw today, with branded at-home kits, including white-labeled Tasso devices, launching December 1, 2026. Karpa can also run as a white-label checkout on the business's own website or through an API, and the same brand can add TRT, HRT, GLP-1 or peptide programs later. Coverage differs: Spot's physician network is licensed in all 50 states, while Karpa covers 47 states and DC.

## Strengths
- Fully branded kits, packaging, portals and email and SMS shipping updates.
- Ready integrations for Shopify (set up from Spot's portal), WooCommerce (a code snippet) and Wix or Squarespace (a custom endpoint Spot sets up).
- API for ordering, tracking and results, with public documentation at docs.spotdx.com.
- Blood, urine and saliva sample types, with custom tests built on request.
- No upfront costs and usage-based pricing, per Spot's docs.
- In-house patient support, including reissued kits and phone help with recollection.

## Limitations
- Built to plug into a store or app the business already runs; a business without one would need to set it up first.
- Partner labs are not named publicly.
- At-home collection only; no lab draw-site option is described.

## When Spot Dx fits
Spot Dx is the stronger fit for a health brand that already runs its own Shopify, WooCommerce, Wix or Squarespace store or its own app and wants fully branded at-home blood, urine or saliva kits fulfilled behind it.

## When Karpa Health fits
Karpa is the stronger fit for a business without a medical license that wants to sell Labcorp testing under its own brand, set its own prices, and add prescription programs later. Karpa Health runs an automated lab storefront under the partner's brand: patient intake, a licensed provider's order, Labcorp testing, and the Labcorp report in a branded patient portal. The partner sets prices, payments settle to the partner's own Stripe account, and a partner portal shows revenue, orders, lab results, custom panels and discount codes. No website build, medical license or LegitScript certification is needed for labs-only. Instead of the ready-made storefront, a business can add a white-label checkout and patient portal to its own website, or connect lab ordering to its own app or platform through Karpa's API.

## Karpa's limitations
- Branded at-home kits launch December 1, 2026; until then customers give samples at a Labcorp patient service center.
- Labs-only storefront pricing is shared on a call rather than published.
- Covers 47 states plus Washington DC; not available in Hawaii, Maine or North Dakota, where Labcorp has no patient service center.
- Labcorp tests only: no specialty kit tests such as DUTCH or Genova.
- Results are not reviewed by a provider by default; a provider reviews them only when the customer books a TRT or HRT consult.
- Karpa's provider network orders every test, so a practice cannot order under its own clinicians' license.

## Frequently asked questions
**How much does Spot Dx cost?**
Spot Dx pricing, as of November 9, 2026: Not publicly listed; Spot states no upfront costs and simple, usage-based pricing. For comparison, Karpa Health also shares its labs-only storefront pricing on a call rather than publishing it; on Karpa the business sets its own retail price for each lab order, payments settle to its own Stripe account, and each order carries a $6 collection fee.

**Spot Dx reviews: what are the pros and cons?**
This is Karpa Health's review of Spot Dx, based on Spot Dx's own public materials as of November 9, 2026. Karpa competes with Spot Dx, so weigh it accordingly. Pros: Fully branded kits, packaging, portals and email and SMS shipping updates; Ready integrations for Shopify (set up from Spot's portal), WooCommerce (a code snippet) and Wix or Squarespace (a custom endpoint Spot sets up). Cons: Built to plug into a store or app the business already runs; a business without one would need to set it up first; Partner labs are not named publicly. The full list, with a source for each fact, is on this page.

**Is Spot Dx legit?**
Spot Dx operates as Spot Health, a Cincinnati company founded in 2021 that went through Y Combinator's Winter 2022 batch. It describes its service as HIPAA compliant, uses its own physician network licensed in all 50 states for doctor's orders, sends samples to partner labs it does not name, and publishes its API documentation at docs.spotdx.com.

**Does Spot Dx work with Shopify?**
Yes. Spot's docs say a Shopify integration is managed from Spot's management portal: you map Shopify SKUs to Spot kit types and add a webhook on the order payment event. WooCommerce stores add a code snippet that sends orders to Spot's API, and for Wix and Squarespace Spot sets up a custom webhook endpoint.

**Who orders the tests with Spot Dx?**
Spot says it built its own physician network licensed in all 50 states and handles the doctor's order where a state requires one, so the brand does not need its own physician. Requisition tools in its API are off by default and are meant for brands that manufacture their own collection kits.

**What are the best Spot Dx alternatives for white label lab testing?**
Businesses comparing white label lab testing also look at platforms that include the storefront and checkout, such as Karpa Health, where a licensed provider orders each test, Labcorp runs it at a patient service center draw, and branded at-home kits launch December 1, 2026. The right choice depends on whether you already run an online store, which sample types you need, and whether you want prescription programs later.

**Do I need a medical license to sell lab tests with Karpa?**
No. A licensed provider in Karpa's independent network orders every test, so the business never orders or interprets labs. Labs-only needs no LegitScript certification, and Karpa's lab testing covers 47 states plus Washington DC.

**How do I sell lab tests with Karpa?**
Three ways: use Karpa's white-label lab storefront under your brand, add Karpa's lab ordering checkout and patient portal to your own website, or connect your own app or platform through Karpa's API. In each, a licensed provider in Karpa's network orders the test, Labcorp runs it, and payments settle to your own Stripe account.

**How do customers give a sample with Karpa?**
They walk in or book a time at a Labcorp patient service center. Branded at-home kits launch December 1, 2026, and from then, above a minimum order quantity, Tasso at-home collection devices can be white-labeled under your brand and sold as a subscription, such as a retest every quarter.

Karpa wrote this comparison and is one of the two companies compared. Every Spot Dx fact comes from a public source listed below, reviewed November 9, 2026.

## Sources
- [Spot Dx homepage](https://spotdx.com)
- [Spot Dx docs: Introduction](https://docs.spotdx.com/docs/introduction.md)
- [Spot Dx docs: Ecommerce Integrations](https://docs.spotdx.com/docs/integrations.md)
- [Spot Dx docs: Core concepts](https://docs.spotdx.com/docs/concepts.md)
- [Spot Dx docs: Using requisitions](https://docs.spotdx.com/docs/requisitions.md)
- [Y Combinator: Spot Health](https://www.ycombinator.com/companies/spot-2)
- [Y Combinator: Spot Health company profile and jobs](https://www.ycombinator.com/companies/spot-health/jobs)

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https://karpahealth.com/book/labs/

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