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PubMed This is a summary of 21 peer-reviewed journal articles Updated
Ophthalmology · Scleritis

The Search for a Cause: Your Diagnostic Workup

At a Glance

Idiopathic scleritis means no cause has been identified yet, not that the evaluation is over. Eye imaging, blood and urine tests, infection testing, and chest imaging help doctors look for autoimmune disease, infection, or causes that may emerge later.

When your doctor labels your scleritis as idiopathic, it doesn’t mean they have stopped looking for a cause. In fact, a critical part of your early journey is a systematic evaluation to investigate underlying diseases. Because scleritis can be the first sign of a systemic condition or a serious infection, your care team must evaluate you carefully before starting intensive treatment [1][2].

The Eye Exam: Looking for Clues

The first step is a detailed physical exam of the eye itself. Your ophthalmologist uses specific tools to see the different layers of the eye wall:

  • Slit-Lamp Exam: This is the standard microscope used in the office. The doctor will use a special light (often a “red-free” green light) to see how deep the redness goes and if the blood vessels stay still when the surface of the eye is moved [3].
  • Anterior Segment OCT (AS-OCT): This is a high-resolution “ultrasound with light” that takes a cross-section of the front of your eye [4]. It can show intrascleral edema (swelling inside the eye wall), which helps confirm scleritis over milder conditions [5].
  • B-Scan Ultrasound: If your doctor suspects posterior scleritis (inflammation behind the eye), they will use a small ultrasound probe on your closed eyelid. This can reveal the “T-sign,” a characteristic shape caused by fluid buildup around the optic nerve [6][7].

Evaluating for Infection: A Safety Priority

Before prescribing high-dose steroids or immunosuppressants, your doctor will consider whether an active infection is present, though urgent sight-threatening disease may be treated while evaluation proceeds. If an unrecognized infection—such as Syphilis, Tuberculosis (TB), or Pseudomonas bacteria—is treated with steroids alone, the immune system’s ability to fight the germ is suppressed, which can cause the infection to worsen rapidly [8][9][10].

Infections are more closely evaluated if you have a history of eye surgery (like cataract or pterygium surgery) or eye trauma, or if your eye has an abscess (a pocket of pus) or unusual discharge [11][12].

The Systemic Workup: The Blood and Urine Tests

Because the sclera is made of collagen, it can be targeted by autoimmune diseases that affect connective tissue throughout the body. Your doctor may order tests to look for conditions like Rheumatoid Arthritis (RA), Granulomatosis with Polyangiitis (GPA), and Systemic Lupus Erythematosus (SLE) [13][14].

Examples of Systemic Testing

Testing is highly individualized based on your history, symptoms, and planned treatments. Not every patient will receive every test, but a workup may include:

Test Category Specific Test Why it’s Checked
Inflammation ESR & CRP General markers showing how much inflammation is in your body [15].
Autoimmune RF & anti-CCP Used to evaluate for Rheumatoid Arthritis, especially if you have joint pain [15].
Vasculitis ANCA (PR3 & MPO) Screens for GPA, a serious condition that affects blood vessels [14].
Lupus ANA A broad screen for Lupus and other connective tissue diseases [15].
Infection Syphilis Serology Syphilis is known as “The Great Mimicker” and can mimic idiopathic scleritis [16].
Infection QuantiFERON / PPD Tests for exposure or sensitization to Tuberculosis (does not definitively prove TB in the eye) [17].
Organ Function Urinalysis Checks for blood or protein in the urine, which can signal kidney involvement from vasculitis [18].
Imaging Chest X-ray / CT Checks the lungs for signs of TB, sarcoidosis, or GPA [19][20].

Note: A negative test does not perfectly rule out the associated disease, and broad testing can sometimes produce false positives. Your doctor will interpret these carefully.

Why “Idiopathic” Isn’t Always Permanent

In one follow-up study of patients with initially unexplained scleritis, approximately 38% were found to have an associated condition over a median follow-up of 42 months [2][21]. This is why your doctor may repeat some tests periodically, especially if your eye inflammation flares up again [3]. Being diagnosed as “idiopathic” today means the search successfully ruled out immediate causes, but the thoughtful evaluation continues as you are treated [2].

Common questions in this guide

What tests are used to investigate idiopathic scleritis?
Doctors may combine a detailed eye examination with blood and urine tests, infection testing, and chest imaging. Depending on your findings, tests can include ESR and CRP, rheumatoid arthritis markers, ANCA, ANA, syphilis testing, tuberculosis testing, urinalysis, and a chest X-ray or CT. Not everyone needs every test.
Why do doctors check for infection before starting steroids for scleritis?
Infections such as syphilis, tuberculosis, or Pseudomonas can sometimes resemble scleritis. High-dose steroids and immune-suppressing medicines can weaken the body’s response to infection, allowing an unrecognized infection to worsen. If the eye is urgently threatened, treatment and evaluation may proceed at the same time.
What does an idiopathic scleritis diagnosis mean?
It means that no associated autoimmune disease, infection, or other cause has been identified so far. It does not prove that a cause will never be found, so your doctor may reassess you or repeat testing if inflammation returns or new symptoms appear.
What do ANCA, anti-CCP, and ANA tests look for in scleritis?
ANCA can help screen for granulomatosis with polyangiitis, while anti-CCP and rheumatoid factor help evaluate rheumatoid arthritis. ANA is a broad screening test for lupus and other connective-tissue diseases. Results must be interpreted with your symptoms and examination because a test can be positive without proving that you have a disease.
Why might I need an ultrasound or chest scan for idiopathic scleritis?
A B-scan ultrasound can help detect inflammation behind the eye, including the T-sign associated with posterior scleritis. Anterior segment OCT can show swelling within the eye wall, while a chest X-ray or CT may look for signs of tuberculosis, sarcoidosis, or granulomatosis with polyangiitis. The imaging selected depends on your symptoms and examination.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Based on my eye exam, are there any signs like an abscess or discharge that might suggest an infection instead of an autoimmune cause?
  2. 2.Which specific tests (like ANCA or anti-CCP) have been ordered to evaluate for systemic conditions like vasculitis or rheumatoid arthritis?
  3. 3.Since my diagnosis is currently idiopathic, what symptoms should prompt us to repeat blood work to see if an underlying condition has emerged?
  4. 4.Do I need a chest X-ray or CT scan to look for signs of sarcoidosis, tuberculosis, or GPA?
  5. 5.Has my urinalysis been checked for signs of kidney involvement, which can be related to certain types of vasculitis?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

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    Scleritis and Development of Immune-Mediated Disease: A Retrospective Chart Review.

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This page explains the evaluation of idiopathic scleritis for informational purposes only and does not constitute medical advice. Your ophthalmologist and other clinicians should interpret your results and guide your care.

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