MRCP2-3228

MRCP2-3228

A 32-year-old woman, who is 30 weeks’ pregnant, presents to the GP complaining of her left foot dragging and tripping her up, particularly when she walks up stairs. Previously her health has been very good, with only mild allergies managed with loratadine.
On examination she looks well, with a BP of 110/70 mmHg; neurological examination reveals mild foot drop consistent with a left common peroneal nerve palsy.
Investigations reveal the following:

Haemoglobin (Hb) 120 g/l 130–170 g/l
White cell count (WCC) 6.2 × 109/l 4.0–11.0 × 109/l
Platelets (PLT) 250 × 109/l 150–400 × 109/l
Sodium (Na+) 142 mmol/l 135–145 mmol/l
Potassium (K+) 4.5 mmol/l 3.5–5.0 mmol/l
Creatinine (Cr) 75 μmol/l 50–120 µmol/l
Erythrocyte sedimentation rate (ESR) 8 mm/hour < 10mm/hour
C-reactive protein (CRP) < 5 mg/l < 10 mg/l
ANCA Negative
Which of the following is the most appropriate management step for this patient?