You probably have remembered correctly, 600 is high. I know I've seen people here have results over 1000, but I think 50 and under is normal. ( Someone please correct me if I'm wrong! ) I asked because faecal calprotectin can also be raised by some fairly mild causes of infammation, such as NSAIDs and acid reflux, but when these cause the inflammation, the faecal calprotectin result is lower than it typically is with IBD, maybe around 200. I'm not sure if something like that could cause your result of 600. 600 is quite high, so it may be more likely to indicate inflammation from IBD. Hopefully someone else knows more about it than I do and can give you a better idea of what it means.