My CIDP Diagnostic Journey: A Real-Life Medical Drama

I live with Lewis Sumner Syndrome, which is a rare variant of CIDP.

My path to a diagnosis of Chronic Inflammatory Demyelinating Polyneuropathy (CIDP) often felt like navigating a maze, except every turn came with more confusion, fear, and uncertainty about what was really happening to my body.

Looking back, I have to give doctors some credit — CIDP isn’t exactly an easy mystery to solve.

When my symptoms first began showing around 2008, it was still something few people in Poland had even heard of.

I remember one neurologist, who performed my EMG, asking if she could use my results in her PhD medical research article.

Of course, I said yes. If sharing a small piece of my story could help someone else find answers sooner, it felt like the right thing to do.

CIDP can feel like a real puzzle — it affects your nerves, causing weakness, numbness, and that unsettling sense of losing control over your body.

Getting an accurate CIDP diagnosis is essential, but the path to it can be slow and confusing, filled with tests, delays, and even misdiagnoses. Not to mention the emotional toll it takes.

In this post, I’ll walk you through the CIDP diagnosis process, explain why it’s often tricky to pinpoint, and share key questions to ask your neurologist so you feel informed, confident, and more in control of your journey.

Understanding CIDP and Its Symptoms

CIDP is an immune-mediated disorder, meaning your immune system mistakenly attacks the protective covering (myelin) of your peripheral nerves. This demyelination slows down or blocks nerve signals, leading to symptoms that may develop over weeks or months.

In my case, the first signs of Lewis-Sumner Syndrome (a CIDP variant) started subtly but alarmingly — I couldn’t lift the two middle fingers of my left hand. I could feel them, but they wouldn’t move. My thumb refused to open, so I lost my grip entirely.

Over time, this weakness led to what’s known medically as an “ulnar claw” — a hand posture where the ring and little fingers bend toward the palm while the others remain extended.

The ulnar claw (aka Griffin-claw hand) happens when the ulnar nerve (which controls some hand muscles) becomes damaged or demyelinated, causing muscle imbalance and loss of control.

Not sexy – I can tell you that…

I also started feeling strange spasms, tingling, and numbness in my fingers, and muscle weakness in my entire arm.

Eventually, things got trickier — I couldn’t type properly on my keyboard, hold my phone with both hands for texting, button up a shirt, fold my washed clothes, style my hair, or chop veggies for dinner.

Even eating became an adventure. To this day – no knife and fork for Anna; and let’s just say juicy American burgers with all their delicious sauces haven’t been a graceful experience since.

When I’m out at a restaurant with “noble company,” I’m careful about what I order — because I eat like a three-year-old: slow, messy, and entirely focused on survival.

“Why did it take so long to get a diagnosis?” —one might wonder.

There’s probably more than one reason, but the main one is that CIDP loves to mimic other neurological conditions.

It takes time, careful evaluation, and detective‑level sleuthing by specialists to finally pin down an accurate diagnosis.

4 Key Tests in Diagnosing CIDP

When a neurologist suspects CIDP, they use several important tests to confirm the diagnosis. Each test uncovers a piece of the puzzle, helping them distinguish CIDP from other conditions

1. Nerve Conduction Studies (NCS) and Electromyography (EMG)

These are some of the most important tests your neurologist will use to check for CIDP. Basically, they see how well your nerves are sending electrical signals and how your muscles respond. In CIDP, these signals slow down or get interrupted because the protective covering of your nerves (myelin) is damaged.

During the test, the neurologist looks for signs like slower signal speed, “blocked” signals, or delays in response — all clues that point to demyelination. Usually, they test several nerves in your arms and legs to see if the problem is widespread.

Not to scare you, but fair warning — this one can hurt. Really hurt.

4. Spinal Fluid Analysis (Lumbar Puncture)

This test involves taking a small sample of the fluid that surrounds your brain and spinal cord — called cerebrospinal fluid (CSF) — through a procedure known as a lumbar puncture, or spinal tap. In many people with CIDP, the protein level in this fluid is higher than normal, but the number of white blood cells stays the same. Doctors call this pattern albuminocytologic dissociation.

This finding can help support a CIDP diagnosis, but it’s not a “smoking gun” on its own, since other conditions can sometimes change CSF protein too.

Is it pleasant? Hell no! On top of that, some people may experience post-lumbar puncture syndrome afterward — which, of course, is a wild ride all on its own.

3. Magnetic Resonance Imaging (MRI)

An MRI is a type of scan that lets doctors take a close look at your nerves, especially around the spine, to see if they’re inflamed or thickened.

While an MRI alone can’t confirm CIDP, it adds helpful clues when combined with other tests like nerve conduction studies. It’s also useful for ruling out other causes of your symptoms, such as spinal issues or structural problems.

I’ve had three or four MRIs myself. Do they hurt? Not at all. Did I enjoy being squeezed into a tight tube, surrounded by creepy darkness, strange, clanging noises, and forbidden to swallow while my salivary glands went rogue and sprayed like a fire hose? Definitely not…

Mentally, it’s a bit of a test too — staying calm while your body rebels and your brain screams, “Why am I here again?” becomes an exercise in patience, self-control, dark humor, and deep, deep breathing.

4. Antibody Testing

Some newer blood tests can check for specific antibodies, like anti-NF155 and anti-CNTN1, which are linked to certain CIDP variants. Knowing whether these antibodies are present can help doctors decide which treatments might work best, since people with these markers sometimes respond differently to therapy.

That said, these tests aren’t done for everyone — they’re usually reserved for more complicated cases or when standard treatments aren’t working as expected.

I can’t even tell if I had them. Would have to ask my Dr. Probably yes.

I’ve given, and keep giving, so much blood for testing that I honestly don’t know what to say — except that, spoiler alert, it’s not exactly a pleasure cruise. Needles are involved, so the lack of fun should go without saying.

Additional Blood Tests and Investigations

To rule out other causes that mimic CIDP — like diabetes, vitamin deficiencies, infections, or other autoimmune diseases — your doctor may order comprehensive blood work. In rare cases, a nerve biopsy may be done but is usually avoided due to its invasive nature.

Along the way, I was tested for Alzheimer’s, Parkinson’s, Lyme disease… and who knows what else. So yeah, that statement is definitely true.

Why CIDP Is Difficult to Diagnose and Common Misdiagnoses

One of the challenges with CIDP is that it shares symptoms with many other neuropathies and neurological conditions, making diagnosis tricky.

• Overlap with Other Conditions:
  Disorders like diabetic neuropathy, hereditary neuropathies, multifocal motor neuropathy, and even some muscular diseases can mimic CIDP symptoms. This means patients are sometimes treated for another disease initially, delaying the correct diagnosis.​

• Incomplete or Misinterpreted Testing:
  Nerve conduction studies require expert interpretation and multiple nerve assessments. If these tests are done incompletely or results are ambiguous, CIDP may be missed or diagnosed incorrectly. Similarly, elevated spinal fluid protein can be seen in other conditions, so relying on a single test may mislead doctors.​

• Subjective Symptom Reporting:
  Symptoms like fatigue, pain, or tingling are common but non-specific. Overemphasis on these without clear evidence of nerve demyelination can also lead to misdiagnosis or inappropriate treatment.​

• Delayed Diagnosis Consequences:
  The longer CIDP goes untreated, potentially due to misdiagnosis, the greater the chance for irreversible nerve damage and disability. Early diagnosis and intervention offer the best chance for symptom control and improved function.​

What You Should Ask Your Neurologist: A Checklist for CIDP Patients

It’s natural to feel overwhelmed during appointments.

I honestly, I DO NOT remember an appointment when I wasn’t scanxiety ridden. If I only knew what I know now…nahh would not make any difference. Still scary.

Having a few questions ready can make all the difference:

1. What tests will you use to confirm or rule out CIDP? Why these tests?
2. How do my nerve conduction study and other test results support a CIDP diagnosis?
3. Are there other conditions that might explain my symptoms? Could I have been misdiagnosed?
4. Is there any need for antibody testing or additional specialized tests in my case?
5. What treatment options are available, and what can I expect regarding results and side effects?
6. How often will I be monitored, and what signs should I watch for to report?
7. Should I consider a second opinion or consultation with a CIDP specialist?
8. What lifestyle changes or symptom management strategies do you recommend alongside treatment?
9. If treatment does not work as expected, what are the next steps?
10. Are there support groups or resources you recommend for patients with CIDP?

Final Encouragement

If you or a loved one are navigating the CIDP diagnostic journey, remember — you are definitely not alone.

The road can feel confusing and uncertain at times, but modern medicine offers better tests and treatments than ever before.

Keep asking questions, reach out to specialists when you can, and don’t be afraid to advocate for yourself. Understanding what to expect and learning how to work with your healthcare team can turn confusion into clarity and frustration into hope.

A diagnosis of CIDP can be life-changing, but with timely and accurate testing, proper treatment, and support, many people regain strength and improve their quality of life. Stay curious, stay proactive, and trust your journey toward better health.

If you found this helpful, consider sharing it with others in the community who are searching for answers on their diagnostic path.

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Disclaimer: I am a CIDP patient, not a medical professional, and I do not provide medical diagnoses or advice. The information in this post is based on my personal experience and research from reputable online sources. My goal is to inform, share insights, and encourage you to take an active role in your health and CIDP journey.

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CARING IS SHARING – IF THIS SUPPORTED YOU IN ANY SMALL WAY, SHARING IT MAY SUPPORT SOMEONE ELSE WITH CIDP, MMN, GBS, OR SIMILAR CONDITION, AND SUBSCRIBING KEEP THIS CIRCLE AND AWARENESS GROWING

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Below, you’ll find the web sources I consulted while writing this post.

Sources: ​

1. https://now.aapmr.org/aidpcidp-part-1-evaluation-and-diagnosis/
2. https://mcpress.mayoclinic.org/cidp/cidp-new-tests-that-help-diagnose-this-rare-condition/
3. https://practicalneurology.com/diseases-diagnoses/neuromuscular/diagnosis-of-chronic-inflammatory-demyelinating-polyneuropathy/32112/
4. https://news.mayocliniclabs.com/2022/08/23/chronic-inflammatory-demyelinating-polyradiculoneuropathy-cidp-test-in-focus/
5. https://pmc.ncbi.nlm.nih.gov/articles/PMC7229131/
6. https://mcpress.mayoclinic.org/cidp/do-i-have-cidp-or-could-it-be-a-misdiagnosis/
7. https://pmc.ncbi.nlm.nih.gov/articles/PMC10875175/
8. https://practicalneurology.com/diseases-diagnoses/headache-pain/chronic-inflammatory-demyelinating-polyneuropathy/31813/
9. https://uat-mcpress.mayoclinic.org/cidp/cidp-new-tests-that-help-diagnose-this-rare-condition/
10. https://connect.mayoclinic.org/discussion/anyone-else-have-cidp/
11. https://www.euroimmun.pl/wp-content/uploads/2024/11/Euro-J-of-Neurology-2021-Van-den-Bergh-European-Academy-of-Neurology-Peripheral-Nerve-Society-guideline-on-diagnosis.pdf
12. https://mayocl.in/2lK5IHG