What is the safest contrast agent for a child for an mri of kidneys? very concerned about side effects. how can we mitigate risk of contrast?

Very safe: All fda approved MRI contrast agents are very safe in people with adequate renal function. Much safer than ct contrast. The incidence of serious allergic reactions is around 1:10, 000. If the renal function is significantly decreased (glomerular filtration rate of less than 30 ml/min), then MRI contrast is contraindicated and should not be used.