Ds(9) has had. problems in the past with kidney pain and unexplained blood and protein in urine. All seem to settle down until he has had a really bad case of flu. Started to pee urine the colour of cola. Practice nurse tested urine and confimed blood and protein present. I contacted the peaditrician that he has seen in the past as I am not really very happy with Drs diagnosis of possible infection. We had his uriine tested. A week later and all blood protein gone. Now seen paediatrician who decided that he must have had a brief episode of nephritis. Tested urine and told protein cretinine ratio 14 mg/mm. Don't want to google too much but what is the normal range for this ratio please? Is it normal to have protein +. ?