Table 3.

Opinion-based recommendation for clinical follow-up intervals of children with a solitary functioning kidney

Clinical Parameter/Modality	No Renal Injury		GFR<60 ml/min per 1.73 m2 or Medication for Proteinuria/Hypertension
	CAKUT −	CAKUT +
BP	One time per year	Two times per year	Two to four times per year
(Micro)albuminuria	One time per year	Two times per year	Two to four times per year
Serum creatinine/GFR	Every 5 years	Every 5 years	Two to four times per year
Ultrasound	Every 5 yearsa	As indicated	As indicated

Guidelines for the clinical follow-up of children with a solitary functioning kidney. The presented follow-up intervals are based on risk assessment at diagnosis; 24-hour ambulatory BP measurement is preferred in children and adults. Microalbuminuria should be determined in a first fresh morning sample (urinary albumin cutoff value>30 mg/24 h). GFR can be estimated using the commonly used Schwartz formula.

^aLast ultrasound to be performed at 15–16 years of age.