Protocol
The patient should be fasted overnight and should empty their bladder before the test.
At t=0:
- give 5 g xylose orally, dissolved in water
- collect all urine for the next 5 hr
- patient should drink 500 ml of water over the next 2 hr
At t=1 hr:
- draw blood and determine concentration of xylose
At t=5 hr:
- finish urine collection
- analyse urine for xylose
Normal results are:
- serum xylose concentration at 1 hr in excess of 1.3 mM
- urinary xylose excretion in excess of 7.0 mmol/5 hr
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