Final answer:
Henoch-Schönlein purpura is the likely condition causing the patient's symptoms, which include lower extremity rash, arthralgias, and abdominal pain. Renal findings in Henoch-Schönlein purpura include glomerulonephritis, proteinuria, and hematuria.
Step-by-step explanation:
The patient with lower extremity rash, arthralgias, and abdominal pain is experiencing a condition called Henoch-Schönlein purpura. Henoch-Schönlein purpura is an immune-mediated condition that primarily affects small blood vessels in the skin, joints, gastrointestinal tract, and kidneys.
Renal findings in Henoch-Schönlein purpura include glomerulonephritis, which is inflammation of the glomeruli in the kidneys. This can cause proteinuria (excessive protein in the urine) and hematuria (blood in the urine). It is important for the patient to receive proper medical evaluation and treatment.