PTH and thyroid nodule: PTH-WO levels (median (IQR)) were significantly higher in the positive group (n = 93, 5000 (IQR: 1600) ng/L), compared to the negative group (n = 11, 17.0 (IQR: 13.1) ng/L) and concomitant thyroid nodule aspirate groups (n = 30, 14.0 (IQR: 4.3) ng/L) (p < 0.001).