The calcium:phosphorus ratio compares two minerals the parathyroid gland keeps in balance, computed automatically from your chemistry panel.
A ratio drifting out of range, with either mineral still inside its own range, is an early hint of parathyroid or vitamin D imbalance worth looking at with PTH and vitamin D.
Optimal Calcium:Phosphorus Ratio: 2.3-3.2 ratio.
Typically re-tested every 12 weeks.