Table 2.

Laboratory investigations in GDD patient 1

Analyte	Result	Reference Range
Serum bone-specific alkaline phosphatase	36	16–56 U/L
Serum total alkaline phosphataste	103	40–115 U/L
Serum calcium	9.1	8.4–10.2 mg/dL
Serum phosphorus	4.2	2.5–4.9 mg/dL
Serum 25-hydroxyvitamin D	41	30–80 ng/mL
Serum intact PTH	17	14–72 pg/mL
Serum TSH	1.28	0.55–4.78 uIU/mL
Serum osteocalcin	32	9–38 ng/mL
Urine N-telopeptide/creatinine ratio	34	9–36 nmol BCE/nmol creat
Bone densitometry, DXA (Z-score)*
Right femoral neck	− 0.7
L1-L4 region	+ 0.7
Right hip	– 0.3

^*Evaluation of the left femoral neck and hip was not possible due to orthopedic hardware.