Short answer · Medically reviewed summary · Last updated: 2026-05-08
Henoch-Schönlein purpura (HSP), now clinically known as IgA vasculitis, is primarily diagnosed through the clinical identification of its hallmark rash, often combined with joint pain, abdominal symptoms, or kidney involvement. While there is no single definitive blood test for Henoch-Schönlein purpura, doctors rely on established classification criteria, and in complex cases, a skin or kidney biopsy may be performed to confirm the presence of IgA deposits. How is Henoch-Schönlein purpura diagnosed? The diagnostic process for Henoch-Schönlein purpura begins with a thorough physical examination.
3 people with Henoch-Schönlein purpura have shared their first-person experience on this question at DiseaseMaps.
How is Henoch-Schönlein purpura diagnosed?
How Henoch-Schönlein purpura is diagnosed: tests, specialists and the diagnostic journey, told by patients and reviewed against medical sources.
Henoch-Schönlein purpura (HSP), now clinically known as IgA vasculitis, is primarily diagnosed through the clinical identification of its hallmark rash, often combined with joint pain, abdominal symptoms, or kidney involvement. While there is no single definitive blood test for Henoch-Schönlein purpura, doctors rely on established classification criteria, and in complex cases, a skin or kidney biopsy may be performed to confirm the presence of IgA deposits.
How is Henoch-Schönlein purpura diagnosed?
The diagnostic process for Henoch-Schönlein purpura begins with a thorough physical examination. Physicians look for the characteristic palpable purpura—small, raised, reddish-purple spots that do not blanch when pressed. Because Henoch-Schönlein purpura is a systemic vasculitis, clinicians must evaluate the skin, joints, gastrointestinal tract, and kidneys to confirm the diagnosis.
What are the official diagnostic criteria?
Most experts utilize the EULAR/PRINTO/PRES criteria for diagnosing Henoch-Schönlein purpura. To meet these criteria, a patient must present with palpable purpura (mandatory) plus at least one of the following:
- Diffuse abdominal pain.
- Biopsy showing predominant IgA deposition.
- Arthritis or arthralgia (joint pain).
- Renal involvement (e.g., hematuria or proteinuria).
Which specialists manage this condition?
Diagnosis is usually managed by a pediatric rheumatologist or an adult rheumatologist, often in collaboration with a nephrologist if the kidneys are affected. Because Henoch-Schönlein purpura can mimic other conditions like idiopathic thrombocytopenic purpura (ITP) or systemic lupus erythematosus, seeing a specialist is vital to ensure an accurate diagnosis and prevent unnecessary testing. We recognize the "diagnostic odyssey" many face; with 106 members on DiseaseMaps.org, we understand the frustration of delayed answers and encourage persistence in seeking specialized care.
Next steps
- Consult a board-certified rheumatologist to review your symptoms and clinical criteria.
- Monitor urine output and blood pressure, as renal involvement in Henoch-Schönlein purpura may be asymptomatic initially.
- Join the Henoch-Schönlein purpura community on DiseaseMaps.org to connect with others who have navigated the diagnostic journey.
Medical disclaimer: This content is for informational purposes only and does not constitute medical advice, diagnosis, or treatment; always seek the advice of your physician or other qualified health provider.
References
- NIH GARD (Genetic and Rare Diseases Information Center): IgA Vasculitis
- Orphanet: Henoch-Schönlein purpura
- The Vasculitis Foundation: IgA Vasculitis (HSP) Overview
- PubMed: EULAR/PRINTO/PRES criteria for Henoch-Schönlein purpura
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