Henoch-Schönlein purpura laboratory findings
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
Laboratory findings
The diagnosis is based on the combination of the symptoms, as very few other diseases cause the same symptoms together. Blood tests may show elevated creatinine and urea levels (in kidney involvement), raised IgA levels (in about 50%), and raised C-reactive protein (CRP) or erythrocyte sedimentation rate (ESR) results; none are specific for Henoch-Schönlein purpura. The platelet count may be raised, and distinguishes the purpura from diseases in which the low platelets are the cause of the purpura (idiopathic thrombocytopenic purpura, thrombotic thrombocytopenic purpura).
Renal disease
Of the 40% of patients who develop kidney involvement, almost all have evidence (visible or on urinalysis) of blood in the urine. More than half also have proteinuria (protein in the urine), which in one eighth is severe enough to cause nephrotic syndrome (generalised swelling due to low protein content of the blood). While abnormalities on urinalysis may continue for a long time, only 1% of all HSP patients develop chronic kidney disease.[1] Hypertension (high blood pressure) may occur. Protein loss and high blood pressure, as well as the features on biopsy of the kidney if performed, may predict progression to advanced kidney disease. Adults are more likely than children to develop advanced kidney disease.[1][2]
References
- ↑ 1.0 1.1
- ↑ Shrestha S, Sumingan N, Tan J; et al. (2006). "Henoch Schönlein purpura with nephritis in adults: adverse prognostic indicators in a UK population". QJM. 99 (4): 253–65. doi:10.1093/qjmed/hcl034. PMID 16565522.