In Reply to ‘The Use of Estimated GFR–Based Staging in Children With CKD: Proceed With Care’

We appreciate the opportunity to respond to the correspondence from Dr Choy1 regarding our article.2 Although caution regarding creatinine measurement is an important discussion, there are a number of factually incorrect points in the letter. The author states that the CKiD study was conducted from 1998 to 2001; it was initiated in 2003, enrollment began in 2005, and follow-up is ongoing. ESCAPE was published in 2009, not 2006. The letter states that the CKiD cohort used creatinine measurements by high-performance liquid chromatography (HPLC).

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