Secondary hyperparathyroidism

Electrolytes, such as calcium, magnesium, and phosphorus, parathyroid hormone (PTH), and 25-hydroxyvitamin D levels should be monitored at a frequency appropriate for the underlying disease. For example, in patients with chronic kidney disease, electrolytes, PTH, and 25-hydroxyvitamin D levels are typically measured every 3 months (more regularly if the patient is receiving dialysis).[1]Kidney Disease: Improving Global Outcomes (KDIGO) CKD-MBD Update Work Group. KDIGO 2017 clinical practice guideline update for the diagnosis, evaluation, prevention, and treatment of chronic kidney disease-mineral and bone disorder (CKD-MBD). Kidney Int Suppl (2011). 2017 Jul;7(1):1-59. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6340919 http://www.ncbi.nlm.nih.gov/pubmed/30675420?tool=bestpractice.com ​ 

Bone densitometry should only be measured if the results will impact treatment decisions. In rare situations, bone biopsy may also be required for clinical monitoring.