How to Prove a Failure to Diagnose Case in Pennsylvania?
January 31, 2026
When a serious condition isn’t caught early, the consequences can be life-changing. In Pennsylvania, failure to diagnose a case lets you seek compensation for harm from a delayed or missed diagnosis. But these medical malpractice claims aren’t easy to win. You have to prove the care fell short of basic standards and that the miss directly caused your harm.
What Is a Failure to Diagnose Case?
A Failure to diagnose a case is a type of medical malpractice case where a healthcare provider did not diagnose a condition that a reasonably careful provider should have found. This can include:
- Failing to order appropriate tests
- Misreading test results
- Ignoring clear symptoms
- Delaying diagnosis without reasonable cause
Just being wrong isn’t enough in Pennsylvania, you must show the mistake caused harm that a proper diagnosis could’ve prevented.
What You Must Prove in a Failure to Diagnose Case
Courts need clear proof on all four fronts that the screw-up likely caused avoidable harm.
1. Duty of Care
Show that a doctor-patient relationship existed. If they examined you, reviewed symptoms, ran tests, or treated you, they owed you competent care.
2. Breach of the Standard of Care
This is often the most difficult part of a failure to diagnose a case to prove. You must show the provider that they didn’t act like a reasonably careful doctor would have.
Proving this usually involves:
- Reviewing medical records
- Comparing what was done to what should have been done
- Relying on expert medical testimony
An expert reviews everything and spells out misses like wrong tests skipped, bad result reads, or ignored red flags. Their word helps judges grasp where it went wrong.
3. Causation
Causation means there must be a clear link between the failure to diagnose and the harm you suffered.
This often involves showing:
- Your condition got worse from delayed treatment
- You missed an earlier, less aggressive treatment
- The illness progressed to a more serious stage
Example: Cancer missed early spreads untreated and needs brutal chemotherapy instead of simple surgery. Experts testify that catching it sooner would’ve improved things.
4. Damages
Finally, you must show measurable losses caused by the failure to diagnose. These damages can include:
- Additional Medical expenses
- Lost income from missed work or reduced ability to earn
- Pain and suffering
Your lawyer helps gather bills, pay records, and personal accounts to show the full impact the missed diagnosis had on your life.
What Evidence Helps Build a Strong Case?

1. Full Medical Records
Getting complete records from all providers involved in your care is a must. These include:
- Doctor notes
- Lab and imaging results
- Referral letters
- Discharge summaries
Your lawyer will review these to identify where the standard of care was not met.
2. Expert Medical Reviews
Experts help explain both the breach and causation. Their review can make or break failure to diagnose cases.
3. Timeline of Care
A clear timeline showing when symptoms started, when care was provided, what tests were ordered, and when the correct diagnosis was made helps show the delay and its impact.
4. Patient Notes
Simple logs of symptoms, changes, and conversations with providers add clarity to your case.
Why Should You Contact a Lawyer Early?
1. Deadlines Matter
Pennsylvania has strict time limits for filing failure to diagnose claims. A Pennsylvania failure to diagnose lawyer can ensure deadlines are met and exceptions are considered.
2. Evidence Takes Time to Gather
Records must be requested and organized, and experts must review them in a process that can’t be rushed.
3. Legal Strategy Is Complex
Failure to diagnose claims requires strategic planning. A lawyer helps clarify what to expect and how to proceed.
Certificate of Merit Requirement in Pennsylvania
Most medical malpractice cases in Pennsylvania require a Certificate of Merit, which confirms a qualified medical professional supports the claim. It must be filed with the lawsuit or within 60 days after filing. Missing this deadline can result in dismissal, even if the case has merit. This is one reason many people contact a lawyer early.
How a Lawyer Helps With Your Case?
Here’s what an experienced failure to diagnose attorney can do:
- Review your medical records and advise on whether a claim exists
- Identify which experts to consult
- Help organize evidence, notes, and timelines
- Handle communications with insurers and providers
- Negotiate settlements or take the case to trial if needed
Your lawyer becomes your guide and advocate in what can be a complicated process.
Take Action to Protect Your Rights
A failure to diagnose can have serious consequences, but you don’t have to face them alone. Contact Lowenthal & Abrams, P.C. to review what happened, discuss your situation, and get a clear understanding of what steps make sense next. Your health, future, and rights deserve careful attention.