LB is a 6-year-old female with a fever, nausea, and malaise. Her mother became aware that LB was not urinating as frequently as normal and brought her daughter to her pediatrician. While the doctor examined LB, her mother volunteered that her daughter had a sore throat about 2 weeks ago, causing her to miss a few days of school. The pediatrician further noted that his patient had periorbital edema and a moderate elevation in her blood pressure. Urinalysis revealed proteinuria and