The Unforeseen Diagnosis: Hyperparathyroidism-Jaw Tumour Syndrome Case Report and Review of the Literature

Table 1

Laboratory results.

Investigations	Level	Reference range
Corrected calcium (mmol/L)	2.65	2.2–2.6 mmol/L
PTH (pmol/L)	9.5	1.3–9.3 pmol/L
PO4 (mmol/L)	0.7	0.8–1.5
Vit D (nmol/L)	99	Optimal: >70 nmol/L
eGFR (mL/min/1.73 m^2)	57	85–125 mL/min
Urine Ca-Cr	0.71, 0.86, and 0.73		Indicative of increased calcium excretion based on body weight of 50 kg
FE-Ca (%)	2.58
Urine calcium (mmol/24 hour)	7.16

PTH: parathyroid hormone; PO₄: phosphate; Vit D: 25-hydroxyvitamin D; eGFR: estimated glomerular filtration rate; urine Ca-CR: urinary calcium-to-creatinine ratio; FHH: familial hypocalciuric hypercalcaemia; FE-Ca: fractional excretion of calcium. Bold signifies blood levels outside of the normal reference range.