<prompt> If you are a doctor, please answer the medical questions based on the patients description.white particles in 3.5 year old son s urine. Been tested no uti. Told it was uric acid crystals from dehydration. He drinks A LOT of fluid a day i quite a bit more than other kids his age, but pees infrequently and when he does it s not much. Once when I took a urine sample and it set for a moment it seperated out into particles and urine. The particles took up about 45 of the sample. The best way to describe it would be if you took cold tea and tried to add sugar and the sugar did not dissolve. Should I be concerned?  <response>: Yes you should be concerned. You describe it well ---it may be simple crystals, but it can also mean that your child has a genetic condition called hereditary primary malaria. This causes the crystals in the urine and may lead to crystals in kidney and liver. Please arrange for a nephrologist and metabolic specialist to see the child for further work up and management. Type of the crystal is important. 