Hypoparathyroidism

Obtain ionized calcium or albumin-corrected total calcium and intact PTH together. Hypoparathyroidism requires hypocalcemia with a low or inappropriately normal PTH; hyperphosphatemia supports the diagnosis but is not sufficient alone. Order serum phosphate, magnesium, creatinine or estimated GFR, and 25-hydroxyvitamin D at the same evaluation. BMJ+2BMJHypoparathyroidism - Symptoms, diagnosis and treatment | BMJ Best PracticePubMedHypocalcemia: Diagnosis and Treatment - Endotext - NCBI BookshelfPubMedHypoparathyroidism - PubMed

Treat neuromuscular irritability, seizures, or other symptomatic hypocalcemia promptly with calcium replacement under careful monitoring; use intravenous calcium for symptomatic disease or profound asymptomatic hypocalcemia with corrected calcium below 1.9 mmol/L, then establish oral calcium and activated vitamin D therapy. Replace magnesium when low because normal magnesium is required for normal PTH secretion. BMJ+2BMJHypoparathyroidism - Symptoms, diagnosis and treatment | BMJ Best PracticePubMedHypoparathyroidism - PubMedPubMedReview of Hypoparathyroidism

Obtain an ECG when clinically significant hypocalcemia is suspected or symptoms are severe; hypocalcemia can prolong the QT interval. Do not delay calcium replacement for completion of etiologic testing in a symptomatic patient. ScienceDirectScienceDirectHypoparathyroidism - an overview | ScienceDirect Topics

Prior anterior neck surgery is the dominant clinical clue: approximately 75% of hypoparathyroidism is postsurgical, whereas about 25% is nonsurgical. Document the procedure, timing, prior calcium and PTH results, and ongoing requirement for calcium or activated vitamin D. PubMedPubMedManagement of Hypoparathyroidism - PMC

Persistent low intact PTH with hypocalcemia requiring treatment for at least 6 months after surgery is commonly considered permanent postsurgical hypoparathyroidism, although some guidelines use 12 months. Continue reassessment during this interval rather than assuming permanent loss immediately after surgery. BMJ+1BMJHypoparathyroidism - Symptoms, diagnosis and treatment | BMJ Best PracticeBMJHypoparathyroidism - Symptoms, diagnosis and treatment | BMJ Best Practice US

In patients without anterior neck surgery, elicit personal and family history of autoimmune disease, congenital syndromic features, childhood onset, or affected relatives. Autoimmune disease and genetic mutations are prominent nonsurgical causes; genetic testing is advised for an unknown cause, especially in patients younger than 40 years with syndromic features. Wiley+2WileyManagement of Hypoparathyroidism - Wiley Online LibraryScienceDirectBest practice recommendations for the diagnosis and management of hypoparathyroidism - ScienceDirectPubMedHypoparathyroidism - PubMed

Use oral calcium supplementation plus an activated vitamin D analogue as first-line chronic therapy. The treatment target is serum calcium in the low-normal range or just below the laboratory reference range, with normalization of serum phosphate, magnesium, and urine calcium when achievable. ScienceDirect+2ScienceDirectBest practice recommendations for the diagnosis and management of hypoparathyroidism - ScienceDirectPubMedManagement of Hypoparathyroidism - PMCPubMedManagement of Hypoparathyroidism: Present and Future - PMC

Select calcium formulation according to absorption conditions: calcium carbonate should be taken with food and requires an acidic gastric environment, whereas calcium citrate is absorbed without gastric acid and is preferred when gastric acid secretion is low. Correct low magnesium concurrently. PubMedPubMedReview of Hypoparathyroidism

Avoid pursuing upper-normal calcium solely to normalize the laboratory value. Serum calcium in the upper normal range increases hypercalciuria in the absence of PTH-mediated renal calcium reabsorption and can promote nephrolithiasis, nephrocalcinosis, and renal damage. PubMed+1PubMedHypocalcemia - Endotext - NCBI BookshelfPubMedManagement of Hypoparathyroidism: Present and Future - PMC

Conventional therapy is first-line, but PTH replacement is an option for adults with chronic hypoparathyroidism who remain inadequately controlled. Conventional-treatment limitations include serum calcium fluctuation, high pill burden, poor quality of life, hypercalciuria, and renal complications. ScienceDirect+1ScienceDirectBest practice recommendations for the diagnosis and management of hypoparathyroidism - ScienceDirectPubMedManagement of Hypoparathyroidism - PMC

Historical FDA labeling for rhPTH(1-84) (NATPARA) limited use to an adjunct to calcium and vitamin D in patients who cannot be well controlled on conventional therapy. The label warned of potential osteosarcoma risk and advised avoiding use in patients with Paget disease, unexplained alkaline phosphatase elevation, open epiphyses, hereditary osteosarcoma-predisposition syndromes, or prior skeletal external-beam or implant radiation. accessdata fdaaccessdata fdaThis label may not be the latest approved by FDA. For current ...

Palopegteriparatide is available for adults with hypoparathyroidism and has been reported to normalize serum calcium, phosphorus, and urine calcium and improve quality of life. Initiation and titration require monitoring of calcium, phosphate, urinary calcium, renal function, and concurrent calcium and active vitamin D requirements; do not use historical rhPTH(1-84) dosing data to dose another product. ScienceDirect+2ScienceDirectBest practice recommendations for the diagnosis and management of hypoparathyroidism - ScienceDirectPubMedManagement of Hypoparathyroidism: Present and Future - PMCPubMedMulticenter retro-prospective observational study on chronic hypoparathyroidism and rhPTH (1–84) treatment

Renal complications are central to chronic management because absent PTH reduces tubular calcium reabsorption and conventional calcium-calcitriol therapy can further increase urinary calcium. Nephrolithiasis and nephrocalcinosis may occur with overtreatment; chronic kidney disease stage 3 or higher has been reported at rates 2- to 17-fold higher than in normal controls in one review. PubMedPubMedReview of Hypoparathyroidism

At each maintenance review, integrate symptoms with serum calcium, phosphate, magnesium, renal function, and urinary calcium rather than adjusting therapy from serum calcium alone. High calcium-phosphorus exposure increases concern for ectopic calcification, while low calcium targets that leave ongoing symptoms justify individualized adjustment or consideration of PTH replacement. PubMed+2PubMedManagement of Hypoparathyroidism - PMCPubMedHypocalcemia - Endotext - NCBI BookshelfPubMedManagement of Hypoparathyroidism: Present and Future - PMC

In chronic postsurgical disease, the diagnosis itself warrants surveillance for multisystem complications. For nonsurgical and genetic disease, pair biochemical follow-up with cause-specific assessment, including thyroid testing in PHP1 because multihormone resistance can occur. ScienceDirect+1ScienceDirectBest practice recommendations for the diagnosis and management of hypoparathyroidism - ScienceDirectPubMedPseudohypoparathyroidism and Related Disorders - StatPearls - NCBI Bookshelf