Hi,
I did some looking into this earlier, when I got back my metal levels at my two year checkup.
My post covers what I found,
http://surfacehippy.info/hiptalk/hip-stories/both-hips-done-recovering/msg37982/#msg37982An award-winning study by researchers from Belgium identified safe upper limits of 4.6 ug/L for chromium and 4.0 ug/L for cobalt in unilateral metal-on-metal hip resurfacing arthroplasties and 7.4 ug/L for chromium and 5.0 ug/L for cobalt in bilateral procedures.
These values are stricter than the UK study found, so even with the stricter guidelines that this study identifies, the safe range is higher than what you have, waddler.
My surgeon said that he would be fine with a reading from either metal at or below 7 ppm. Mine fell below 3.5, so I was satisfied, being a bi hippy.
susanna - you haven't mentioned what your readings were? We do have a metallic implant, so our levels will be elevated, it depends what the readings are.
Have you spoken to your surgeon, or an HR surgeon about your levels?