What laboratory tests should be monitored for a client taking sulfasalazine (azulfidine)?

Azulfidine (sulfasalazine): "Complete blood counts, including differential white cell count and liver function tests, should be performed before starting Sulfasalazine and every second week during the first three months of therapy. During the second three months, the same tests should be done once monthly and thereafter once every three months, and as clinically indicated. Urinalysis and an assessment of renal function >