Familial hypocalciuric hypercalcemia (FHH) is an inherited condition that can cause hypercalcemia, a serum calcium level typically above mg/dL. It is also . Familial hypocalciuric hypercalcemia (FHH) is a generally asymptomatic genetic disorder of phosphocalcic metabolism characterized by lifelong moderate. Familial benign (hypocalciuric hypercalcemia (FHH) is caused by a loss-of- function mutation of one allele of the gene for the calcium-sensing.

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In some cases circulating parathormone levels are elevated and can lead to neonatal severe ‘primary hyperparathyroidism’ in offspring of affected women.

Familial hypocalciuric hypercalcemia – Wikipedia

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Familial hypocalciuric hypercalcemia HHC is a heritable disorder of mineral homeostasis that is transmitted as an autosomal dominant trait with a high degree of penetrance. Preliminary localization of a gene for autosomal dominant hypoparathyroidism to chromosome 3q Moreover, the authors presented evidence that normal maternal calcium homeostasis prompted additional secondary hyperparathyroidism in the fetus, thus contributing to the severity of the NSHPT in this patient with FHH.

The sporadic patient was a year-old woman with a history of renal stones 20 years previously, who was hypercalcemic with an elevated PTH level and hypercalciuria. Familial hypocalciuric hypercalcaemia FHH fwmilial a rare, lifelong, benign condition.

It can be considered if both parents have FHH type 1, as their offspring have a higher risk of developing neonatal severe primary hyperparathyroidism NSHPT; see familiwl terma particular clinical identity which can be life-threatening. Congenital endocrine disorders Q Commonly, the parathyroid hormone level is checked and may be slightly elevated or also on the high normal end. Unlike primary hyperparathyroidism, hypercalcemia of this origin begins before age 10 years and is not accompanied by urinary stone or renal damage.

Screening of family members revealed mild hypercalcemia, unsuppressed serum PTH, and marked hypocalciuria in 2 sibs, his father, and his paternal grandmother. Neonatal severe primary hyperparathyroidism and alkaptonuria in a boy born to related parents with familial hypocalciuric hypercalcemia. Concentrations of peptide hormones other than parathyroid hormones were common in patients with FHH.


Most cases of familial hypocalciuric hypercalcemia are asymptomatic. We are determined to keep this website freely accessible. No treatment is generally required, as bone demineralisation and kidney stones are relatively uncommon in the condition.

Antenatal diagnosis As FHH is benign, prenatal testing is not recommended. Genetic counseling FHH is inherited as a dominant hypocalcijric.

Familial Hypocalciuric Hypercalcemia – Cancer Therapy Advisor

Hypercalcmia and treatment As FHH is usually asymptomatic, treatment is not necessary. There are 3 genetic types of FHH based on chromosome location.

Only comments seeking to improve the quality and accuracy of information on the Orphanet website are accepted. Clinical Variability Pasieka et al. In a year-old man with hypercalcemia, hypercalciuria, and recurrent nephrolithiasis, Mastromatteo et al.

Familial hypocalciuric hypercalcaemia: a review.

The distinction between the acquired and hereditary forms is important because glucocorticoids may control the acquired form and parathyroidectomy is rarely necessary for familial hypocalciuric hypercalcemia. The authors stated that this family displayed characteristics that were atypical for FHH, but noted that FHH patients previously had been reported with high urinary calcium levels.

Only later was FHH described and was it realized that most cases of neonatal severe primary hyperparathyroidism occur in families with FHH. Typically, diagnosis is made in the pursuit of uncovering the etiology of hypercalcemia. They also excluded basic fibroblast growth factorparathyroid hormoneand several other candidate loci.

Inborn error of metal metabolism E83 CASR Familial hypocalciuric hypercalcemia. Clapham pointed out that familial hypocalciuric hypercalcemia joins the list of disorders due to defective G protein receptors, others being defects in the thyrotropin receptorthe luteinizing hormone receptorthe V2 vasopressin receptor AVPR2;rhodopsinthe ACTH receptorand the cone opsin receptors see Phenotypic Series Toggle Dropdown.


In particular, does your patient take any medications – OTC drugs or Herbals – that might affect the lab results?

Cancer Therapy Advisor Weekly Highlights. Summary Epidemiology Prevalence is unknown. Arnaud ; Davies et al. Subtotal parathyroidectomy was performed at 6 weeks; hypercalcemia recurred rapidly, but the bone disease improved gradually with reversion to an asymptomatic state resembling FHH.

Etiology There are 3 genetic types of FHH based on chromosome location. In addition, these results indicated that NSHPT is not exclusively the result of homozygosity for a mutation that causes familial benign hypercalcemia in the heterozygous state but rather can be due to heterozygosity for mutations at the CASR locus. Similar to PHPT, FHH is characterized by hypercalcaemia, unsuppressed or elevated plasma parathyroid hormone, and typically normal renal function.

Calcium-sensing receptor mutations in familial benign hypercalcemia and neonatal hyperparathyroidism. Disease definition Familial hypocalciuric hypercalcemia FHH is a generally asymptomatic genetic disorder of phosphocalcic metabolism characterized by lifelong moderate hypercalcemia along with normo- or hypocalciuria and elevated plasma parathyroid hormone PTH concentration. Copper toxicity Wilson’s disease.

As FHH is usually asymptomatic, treatment is not necessary.

Familial Hypocalciuric Hypercalcemia

The frequency of gallstones is increased; indeed, this is the only discernible increase in medical problems. Powered By Decision Support in Medicine.

Clinical description FHH is biologically characterized by moderate but significant hypercalcemia associated with levels of PTH and urinary calcium hypocalciuruc that appear inappropriate in the presence of the hypercalcemia: Abnormal serum protein binding of calcium and magnesium in FHH was excluded.

Hypercalcaemia Milk-alkali syndrome Burnett’s Calcinosis CalciphylaxisCalcinosis cutis Calcification Metastatic calcificationDystrophic calcification Familial hypocalciuric hypercalcemia. CC HPO: