PTH: Redefining Reference Ranges in a Healthy Population—The Role of Interfering Factors and the Type of Laboratory Assay

Table 4

Blood donors divided according to the cutoffs of 25OHD3 levels, deficiency (≥50 nmol/L), and sufficiency (≥75 nmol/L) and according to PTH levels obtained with the third-generation assay (>26.8 pg/ml versus >4.6 and ≤26.8 pg/ml and <4.6 pg/ml).

	All patients 108 (100%)	PTH 3^rd generation >26.8 pg/m 28/114 (25.0%)	PTH 3^rd generation >4.6 and ≤26.8 pg/ml 86/114 (75.0%)	PTH 3^rd generation <4.6 pg/ml 0/114 (0%)	value
25OHD3 < 50 nmol/L	61 (100)	16 (26%)	45 (74%)	0 (0%)	0.74
25OHD3 ≥ 50 nmol/L	47 (100)	11 (23%)	36 (77%)	0 (0%)
25OHD3 ≥ 75 nmol/L	7 (100)	2 (29%)	5 (71%)	0 (0%)	0.82
25OHD3 < 75 nmol/L	101 (100)	25 (25%)	76 (75%)	0 (0%)