Determinants of extracellular fluid calcium concentration in patients with chronic hypoparathyroidism
Authors' conclusion
The main determinant of blood calcium levels in patients with chronic hypoparathyroidism is tubular calcium reabsorption, assessed by TRCa/GFR. Alfacalcidol is effective in correcting hypocalcemia due to its tubular effect but may lead to renal complications due to its intestinal and bone effects. The use of complementary treatment with thiazide diuretics or PTH analogs, possibly guided by the calculation of TRCa/GFR, could allow a better correction of hypocalcemia in these patients.
Study context
- Population
- Patients with chronic hypoparathyroidism
- Participants
- 101 patients
- Outcome
- Determinants of serum calcium concentration (intestinal absorption, renal tubular reabsorption, net bone release)
Methodological detailssingle-centre, consecutive patients, multivariable linear regression
- Single-centre
- Consecutive patients
- Multivariable linear regression
Main finding
As reported in the abstract
Variables independently associated with serum ionized calcium
- TRCa/GFR, fasting UCa/UCr and alfacalcidol dose independently associated with serum ionized calcium
- TRCa/GFR the most important explanatory variable, followed by UCa/UCr
- Alfacalcidol dose the only modifiable variable independently associated with TRCa/GFR and UCa/UCr
Observational data: associations, not effects.
Further findings
- Patients in longitudinal analysis
- 33
- Increase in ionized calcium with higher alfacalcidol dose mostly associated with increase in TRCa/GFR
Original publication
Determinants of extracellular fluid calcium concentration in patients with chronic hypoparathyroidism. Eur J Endocrinol. Published 19 February 2026. doi:10.
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