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lüll Histomorphometric measurements of bone turnover, mineralization, and volume Ott SMClin J Am Soc Nephrol 2008[Nov]; 3 Suppl 3 (Suppl 3): S151-6A recent Kidney Disease: Improving Global Outcomes report suggested that bone biopsies in patients with chronic kidney disease should be characterized by determining bone turnover, mineralization, and volume. This article focuses on the calculations and interpretation of these measurements. In most cases of renal osteodystrophy, the bone formation rate is roughly similar to the bone resorption rate; therefore, the bone formation indices can be used to describe turnover. It is important to remember that these conventions will not apply in some situations. Activation frequency should not be confused with bone formation rate or bone metabolic unit birth rate. Abnormal mineralization can be described using the osteoid volume, increased osteoid maturation time, or increased mineralization lag time. The concept of bone volume is the easiest to understand, but there is a large error from one biopsy to the next in the same person. There are some difficulties with each of the measurements, and further research in patients with chronic kidney must be done to enable a consensus to be reached about cut points to define categories within the spectrum of renal osteodystrophy and how to evaluate treatment responses.|*Bone Remodeling[MESH]|*Calcification, Physiologic[MESH]|Biopsy[MESH]|Bone Resorption[MESH]|Bone and Bones/*pathology[MESH]|Chronic Disease[MESH]|Chronic Kidney Disease-Mineral and Bone Disorder/physiopathology[MESH]|Humans[MESH]|Kidney Diseases/*pathology/physiopathology[MESH]|Osteogenesis[MESH] |