My 13y/o daughter just saw nephrologist for 1st time for proteinuria. he wants to start her on lisinopril.is this too soon without more test?

Proteinuria : As you did not mention it, she probably does not have diabetes. At her age, she could have a glomerulonephritis (g). This can be diagnosed, at times, with blood work. She needs to have a 24 hour urine done to quantify the amount of proteinuria (p) she has. Depending on its amount, a kidney biopsy may be needed to get a diagnosis .Lisinopril can reduce p. Knowing what p is due to is important.

Proteinuria: She requires quantification of how much protein or albumin is spilling into her urine. This is best done with morning void of a cup of urine. This is submitted to a lab which will assay protein:creatinine ratio or albumin:creatinine ratio. Then lisinopril should commence and she should submit a urine sample every 2-3 months so that dose of lisinopril can be titrated up to assure best result