hum, sounds like 4.4 is Taz' creatinine and 75 is his BUN or blood urea nitrogen ... BUN gives sort of a general overview of kidney function and creatinine is more specific and reflects kidney function over time. I hope they come back down and Taz eats really well!

HUGHUGHUGHUGHUGHUGHUGHUG for Taz, Paizly and Zoee...
elyse