These useful tests can be helpful in differentiating between the causes of Nephritic syndrome, but can take a while to get processed.
The renal team see the patient and take over his care. You enquire after the patient a few days later and hear that he has undergone a renal biopsy. This shows a crescentic glomerulonephritis, but immunofluoresence on the biopsy was negative.
Which of these blood tests do you think will be positive?
(d) Anti-ds DNA