My MIL not well. Is 75, has MS, had 18 months of ill health. A small stroke, pneumonia, atrial fibrillation. Over Xmas really out of it. Now she is in hospital after a gp blood test to show kidneys not working well. She's been in hospital for 10 days. Kidney function not recovering well so renal biopsy now needed. What is the prognosis? What are they looking for?