What it is
PTH is a hormone from the parathyroid glands that helps regulate blood calcium and phosphate.[1,2]
Why it matters
It links blood calcium, phosphate, vitamin D, kidney function, and bone remodeling.[1,3]
Root causes of abnormal values
- Physical core: PTH rises when the parathyroid signal is being used to restore or maintain blood calcium, and it falls when that signal is suppressed. The immediate chain is calcium sensing -> PTH release -> calcium movement from bone, gut absorption context, and kidney calcium handling.[1]
- Pattern layer: The meaning changes with the calcium-phosphate-kidney pattern: high PTH with high calcium, low calcium, vitamin D deficiency, or CKD mineral-bone context are different maps, not one universal cause.[1,3]
- Reading boundary: BioConst can explain the control loop, but it does not decide whether a PTH result means primary, secondary, kidney-related, medication-related, or other endocrine disease.[1,3]
What it affects
Interpretation traps
- PTH is high-risk for self-interpretation; same-draw calcium, kidney function, vitamin D, medicines, and lab method matter.[1]