[Dr.Vad]

Еще информация об этом заболевании компактно изложена здесь

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не знаю, насколько релевантно, но там еще такое:

Serum Magnesium is in the upper-normal range or mildly elevated; whereas, serum magnesium tends to be normal or low in primary hyperparathyroidism.

Detection of asymptomatic hypercalcemia before the age of 40 years or so favors the diagnosis of FHH. Obtaining serum calcium values from first-degree relatives in the absence of a family history can be helpful.

Other causes of PTH-dependent hypocalciuric hypercalcemia should be ruled out, for example, vitamin D deficiency, very low calcium intake, mild renal insufficiency, and treatment with thiazide diuretics or lithium. Correction of any of these abnormalities will lead to hypercalciuria if the patient has PHPT.