MRCP2-3818

MRCP2-3818

A 28-year-old female patient presents with a widespread maculopapular rash accompanied by fever and lower back pain. She has also noticed swelling in both her legs. The patient had visited her GP three weeks ago and was prescribed amoxicillin for a chest infection. A urinalysis was performed, and the results are as follows:

Urinalysis
Blood +++
White cells +++ (eosinophils+++)
No organisms seen
Glucose –
Nitrates –

Blood tests:

Hb 10.6 g/dl
MCV 86 fl
Platelets 390 * 109/l
WBC 9.2 * 109/l

Na+ 136 mmol/l
K+ 4.2 mmol/l
Urea 12.4 mmol/l
Creatinine 135 µmol/l

What is the most probable diagnosis?