24-hour urine protein 0.3 is a small amount of protein, usually does not lead to serious consequences, much less affect life expectancy, do not worry too much. Normal human urine contains a trace amount of protein, 24-hour urine protein amount of 0.15g or less is normal, more than this value is abnormal, healthy teenagers urine protein amount is slightly higher, there will be 0.25g. 0.3g only more than 0.15g, although suggests that there is proteinuria, but does not mean the existence of kidney disease, generally do not need special treatment, as long as the regular to the nephrology department review follow-up. Normal adults can also have a small amount of proteinuria in a short period of time under special conditions, such as fever, strenuous exercise, drunkenness and so on. Urine protein 0.3 serious or not, but also combined with other aspects of the patient to make a comprehensive judgment, the first discovery of urine protein abnormality is recommended to the nephrology specialist to clarify the cause of the disease, so as not to delay the condition.