Assuming that you mean total bilirubin levels in (mmol/L), the range should be 5 to 17 in adults.
So, 33.9 would be high. High biliubin suggests that there may be damage, an infection, or some loss of function in the liver, gall bladder or pancreas. Certain medicines and supplements may also increase bilirubin levels. This is a preliminary test. The actual cause of the disruption will require most testing.
Just for your information, newborn infants can have very high bilirubin levels (above 100-200 mmol/L) and still be within the normal range.
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