Can Relapsing Polychondritis Flare With Normal CRP and ESR?

Yes, it is possible to experience an active relapsing polychondritis (RP) flare even if your C-reactive protein (CRP) and erythrocyte sedimentation rate (ESR) blood tests are normal ^[1]. While these tests measure general inflammation in the body, they do not always capture the specific inflammation happening in your cartilage or organs ^[1]. Normal blood work does not rule out an active flare, but it also does not mean every new symptom is definitely RP. Your physical symptoms, combined with a doctor’s examination and targeted testing, often provide a more complete picture of your disease activity ^{[1] [2]}.

Why Blood Tests Don’t Tell the Whole Story

CRP and ESR are non-specific markers. They can rise for many reasons (like a common infection) and stay normal even when an autoimmune disease is active. In patients with RP, inflammatory markers do not perfectly correlate with clinical symptoms or what doctors see on imaging scans ^[1]. For example, in one retrospective study of 131 patients with RP, researchers found that ESR was elevated in about 86% of patients and CRP in about 82% ^[3]. This means a meaningful minority of patients in the study had normal results despite active disease.

The location of your flare may also play a role. Patients presenting with localized disease, such as inflammation confined to the ear cartilage, may have a lower inflammatory status on average compared to those with widespread flares ^[4]. Conversely, patients with respiratory or multiorgan involvement often show higher levels of these markers ^[5]. However, these are general trends; a localized flare can still occur without spiking your CRP or ESR, and normal markers do not guarantee your airway or organs are clear.

Do Not Change Medications Based on Blood Tests Alone

Because CRP and ESR can be misleading, do not independently start, stop, increase, or taper your RP medications based purely on a “normal” blood test result. Always follow the individualized plan from your prescriber.

Relying solely on blood work to decide when to taper medications can lead to relapses. In one small observational study of six patients using ultrasound to look at ear cartilage, researchers found that active inflammation persisted in the cartilage of two patients even after their clinical symptoms and blood markers had returned to normal ^[6]. When those patients tapered their steroid medication, they quickly experienced an early flare ^[6]. While ear ultrasound is not yet a universally validated standard for monitoring, this highlights why medication changes must be carefully guided by a doctor evaluating your complete clinical picture.

Better Ways to Track an RP Flare

RP has no single universally accepted biomarker or flare test. Instead, your rheumatologist will rely on a combination of your symptoms, a physical examination, and organ-specific testing ^[7].

When to Get Help Now (Emergency Symptoms)

Airway involvement in RP can become life-threatening. Do not wait for a rheumatology appointment or blood tests if you experience:

• Severe or rapidly worsening difficulty breathing
• Stridor (a high-pitched whistling or gasping sound when you breathe in)
• Blue lips or an inability to speak in full sentences
• Sudden, severe chest pain

Call local emergency services or go to the nearest emergency department immediately ^{[8] [9]}.

Additionally, seek urgent specialist care for:

• Sudden changes in vision or severe eye pain with light sensitivity ^[10]
• Sudden hearing loss or major new balance issues (vertigo) ^[11]

Routine Symptom Tracking and Examination

For day-to-day monitoring, pay close attention to new or worsening ear and nose pain, red eyes, joint swelling, or milder airway symptoms like a new cough or hoarseness ^[7]. Keep in mind that new symptoms could also be caused by infections, medication side effects, or other conditions. A thorough physical examination of your ears, nose, eyes, airways, and joints can help your doctor evaluate if RP is the true cause of your symptoms ^[7].

Advanced Imaging and Organ-Specific Testing

When symptoms are unclear, specialists may use targeted tests to look directly at affected tissues. These tests are not required for every flare and have limitations (such as radiation exposure or requiring specialized interpretation), but they may be used when clinically indicated to evaluate your disease and guide management:

• Ultrasound: A test using sound waves that can sometimes detect hidden inflammation in the ear cartilage ^[6].
• Dynamic chest CT scans: A specialized X-ray that takes images of your airway as you breathe in and out, helping detect structural damage or narrowing ^[12].
• Pulmonary function tests (PFTs): Breathing tests that measure how well your lungs and airways are working ^[12].
• Magnetic Resonance Imaging (MRI): Detailed imaging that can sometimes spot inflammation in the cartilage, joints, or blood vessels ^{[1] [13]}.
• Specialist Evaluations: Depending on your symptoms, you may need a slit-lamp exam (a specialized microscope check of the eye) with an ophthalmologist or a hearing test with an audiologist ^{[10] [11]}.

Normal blood results do not invalidate your symptoms, but they also cannot establish that every symptom is an RP flare. If you feel unwell, contact your clinician for an appropriate assessment.