Why high test coverage matters for healthcare apps

Test coverage is not another metric in healthcare software testing but a business-critical factor that impacts the competitiveness of your app. Serving as a trust indicator, it makes a great difference. Regulators, providers, and enterprise buyers treat high test coverage as evidence of safety and effectiveness, and for a reason.

Gaps in coverage can cause patient harm, trigger costly recalls, or slow down regulatory review. Extensive test coverage, in turn, shortens validation cycles, reduces field failures, and becomes a decision factor for hospitals, payers, and investors.

You might be wondering, "Doesn't more testing mean more time and cost?" Not if automated testing is designed and implemented the right way. For example, for Abbott's cloud-based diabetes management platform, DeviQA increased test coverage from 50% to 90%, while cutting execution time from 2.5 weeks to 1 day only.

If you want to avoid costly corrective actions, preserve brand reputation, and stay competitive, test coverage should be at the top of your agenda.

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Test coverage and its measurement

Test coverage is often misunderstood. Many narrow down its meaning only to code coverage, i.e., how much of the source code is executed during testing. In fact, test coverage goes beyond code. It measures how thoroughly your app has been tested against its requirements, risks, and real-world workflows. This way, a multi-dimensional safety net is created.

By looking at coverage from multiple angles, QA teams gain a clear picture of both breadth (how much of the system is tested) and depth (how well critical risks are validated). That clarity is what enables faster approvals, safer products, and greater trust from customers.

The math behind test coverage is simple:

(Number of executed tests ÷ Total planned tests) × 100%

This formula is adjusted to every type of coverage:

High percentages across all of them signal to regulators and buyers that the healthcare app is both clinically sound and commercially ready.

Importance of high test coverage for healthcare app competitiveness

For healthcare product owners, investing in test coverage isn't just about hitting a number but building a solution that can perform in one of the most demanding markets. Teams that reach extensive coverage get a lot in return.

High test coverage delivers business value in a number of ways:

Meeting the highest quality standards: Extensive test coverage ensures that every critical feature, workflow, and risk scenario is properly verified before release. For example, after the first 7 months of collaboration with DeviQA, CipherHealth saw a 35% drop in production bugs, proving that high coverage boosts product quality and reliability.

Getting regulatory approval faster and smoother: FDA or EU regulations require strong evidence that an app has been thoroughly tested against all functional, safety, and risk-related requirements. By making sure every high-risk scenario has a test behind it, teams can speed up review cycles and get to market faster.

Reducing costs significantly: Resolving defects early in development is always far cheaper than fixing issues in production. High coverage facilitates the reduction of hotfixes, emergency patches, and customer escalations.

Gaining user loyalty: Clinicians, patients, and administrators depend on healthcare software to work flawlessly. Applications that operate as intended under different real-world conditions earn trust, encourage repeated use, and foster long-term loyalty.

You see, high test coverage isn't just a technical metric but a way to protect patients, satisfy regulators, cut costs, and win user trust. For any healthcare product owner who wants their solution to stay competitive, high test coverage is a must.

Test coverage as a way to meet user expectations

Nowadays, healthcare apps lie at the core of patient care. With telemedicine solutions, mobile health apps, and connected devices rapidly adopted, users expect the same ease and reliability they get from consumer apps. The only difference is the extra layer of safety and compliance that healthcare demands.

Let's review core expectations of healthcare app users that high test coverage helps to meet:

Reliability

Reliability is not only a user expectation but a fundamental requirement for healthcare software.

For instance, with healthcare application testing services from DeviQA, Thrive achieved 99% test coverage on its mental health app, which resulted in fewer bug reports and stable performance, reinforcing clinician confidence in the product.

When clinicians use a platform to check a patient's record, or when a diabetic patient relies on their app for glucose readings, there is no room for malfunction. In these settings, reliability is a matter of survival.

High test coverage reduces bugs, ensuring that every feature works as intended under real-world conditions.

Compatibility

The healthcare infrastructure is fragmented: different devices, browsers, operating systems, and numerous integrations with medical systems. If an app fails to operate seamlessly on just one of these, adoption may slow down. Therefore, for Abbott, we run tests on 20+ devices. Similarly, for the Catalyst BCBA therapist mobile app, we run tests on all supported iOS/Android versions, including beta versions, to ensure that it works flawlessly on every popular tablet and phone. The Catalyst web portal also underwent thorough testing across all required browsers and resolutions. High coverage across environments ensures apps don't break when they meet real-world diversity.

Ease of use

Intuitive interfaces enable clinicians and patients to focus on treatment, not on figuring out how to use the software. Health apps with clunky or confusing UI/UX are quickly abandoned. Manual QA plays an important role in spotting usability issues. The best results come when designers and QA experts work side by side from the early stages.

That's exactly the approach our team applied while working on the Thrive app. By collaborating closely, we improved navigation, clarified the interface, and raised overall user satisfaction. So, usability should also be covered because if your app frustrates users, they'll simply stop using it.

Privacy and security

Healthcare data is among the most sensitive in the world. Its solid protection is both a legal requirement and a trust factor. A single data breach risks patient trust, regulatory penalties, and irreparable brand damage. Compliance with HIPAA, FDA, GDPR, and other regulations mandates thorough testing, including security and penetration tests. High coverage in security testing demonstrates to users and auditors alike that the health app is trustworthy.

Rich integrations

Modern healthcare apps rarely stand alone. Often, they need to connect with wearables, EHR systems, cloud platforms, and other services. While bringing value, every integration also introduces risks of data mismatches or workflow failures. Integration and interoperability testing ensure these connections work smoothly, while end-to-end testing validates the full data flow across systems.

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How to gain high test coverage

Reaching extensive test coverage requires more than running more tests. In essence, it calls for discipline, planning, and the right tooling. Below are key strategies that QA teams can use to expand coverage of healthcare apps.

1. Introduce risk-based testing

Risk-based testing ensures resources are directed to those app areas that matter most, i.e., those with the highest potential impact on patient safety, clinical workflows, and regulatory compliance. Instead of treating all features equally, this approach considers risk factors such as the likelihood of failure and the severity of consequences.

2. Adopt automation

Automated testing is the engine of scalable coverage. It speeds up regression cycles, ensures consistency, and optimizes resource usage. For example, for the Arklign dental management platform, we automated 90% of test cases, integrated them into CI/CD, and implemented parallel test runs on 20 threads. This helped to expand testing coverage while reducing testing time.

3. Regularly review and update test cases

Healthcare software constantly evolves, and your test suite must evolve with it. Test cases that aren't updated quickly become useless.

At DeviQA, maintaining clean and relevant documentation is a usual thing. For example, when collaborating with Woundtech, we restructured their existing test documentation, simplifying maintenance and expansion. This way, we improved clarity, consistency, and coverage, and all test cases became easy to follow, always up-to-date, and fully aligned with best testing practices.

4. Cover functional and non-functional testing

Coverage must include both what the app does and how it performs. Functional tests validate clinical workflows, while non-functional testing covers performance, security, usability, and accessibility. In healthcare, neglecting non-functional testing can have costly consequences: performance issues during peak telehealth sessions or vulnerabilities in data transmission can affect users' trust and trigger compliance penalties.

5. Use diverse and representative test data

Healthcare data is anything but uniform. To catch real-world issues, testing should include varied and realistic data. Therefore, include rare lab values, multiple languages, and variations in patient demographics, clinical scenarios, and workflows. This approach will help you ensure correct app behavior across all expected conditions.

6. Expand device and environment coverage

Healthcare software should operate equally flawlessly across different devices, operating systems, browsers, and third-party integrations. Run tests on multiple physical devices, emulators, and OS/browser combinations. Also, include connected medical devices and integrations with EHR or cloud systems. Limited testing in terms of compatibility can leave gaps that affect user adoption or patient safety.

7. Track test coverage

You can't improve what you don't measure. Tracking coverage across requirements, risks, workflows, code, and environments gives clear visibility into both strengths and gaps.

Executive-friendly dashboards make this information easy to digest, highlighting where coverage is solid and where attention is needed.

How professional healthcare software testing services can help extend test coverage

Testing healthcare applications is an art. Achieving and maintaining high test coverage is a challenge. Apart from fine-tuned processes, it requires expertise in the corresponding medical field, regulatory compliance, risk-based testing, automation, and specialized tools. Specialized healthcare software testing services, like those provided by DeviQA, can support you in this.

The thing is that QA outsourcing provides immediate access to:

• Expert QA engineers who have rich experience in quality assurance and understand healthcare regulations, workflows, and patient safety priorities.

• Advanced toolchains for automation, coverage tracking, performance, and security testing.

• Proven methodologies that balance functional and non-functional testing, accelerate release cycles, and keep coverage aligned with evolving product needs.

• Scalability on demand, enabling teams to expand testing rapidly when preparing for launches or regulatory submissions.

Real-world results speak louder than promises

Working across various healthcare projects, DeviQA helped in-house software development and QA testing teams achieve high test coverage:

• Abbott — 90% test coverage

• Arklign — 95% feature coverage

• CipherHealth — 90% feature coverage

• Woundtech — 80% test coverage

• Thrive — 99% regression test coverage

These outcomes show what's possible when healthcare companies partner with a dedicated QA provider. Instead of struggling to expand coverage internally, product owners can rely on an experienced team that knows how to meet the unique demands of healthcare software.

Conclusion

In healthcare, a gap in tests can have real consequences, impacting patient safety, slowing regulatory approval, or destroying user trust. High test coverage is the foundation for healthcare apps that work reliably, meet compliance, and stay ahead in a competitive market.

If you want to extend coverage, speed up delivery, and confidently meet user and regulator expectations, it's a wise move to bring in professionals who've done it before.

Investing in comprehensive testing pays off with smoother regulatory audits, fewer production issues, optimized costs, and confidence that your app performs under real-world conditions. So, the question isn't if you need high coverage, but how quickly you can get there.

Feel like gaps in your tests pose a real threat, but you're not sure how to address them? Reach out to DeviQA's experts for a consultation to learn in which way we can help.

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About the author

Mykhailo Ralduhin

Senior QA engineer

Mykhailo Ralduhin is a Senior QA Engineer at DeviQA, specializing in building stable, well-structured testing processes for complex software products.