*3.5. Postoperative Serum Parathyroid Hormone*

Thirteen of the 25 studies reported on postoperative parathyroid hormone (PTH) levels. Some studies using ICG reported that having at least one well-perfused PG (with an ICG score of 2) after thyroid gland resection predicted normal postoperative PTH [44,60,65]. None of the comparative studies found a statistically significant relationship for postoperative PTH levels between study and control groups, except for [66], which found a statistically significant lower incidence of transient hypoparathyroidism in the NIRAF group (33.7% vs. 46.6%; *p* = 0.002). Three studies [45,48,49] demonstrated better PTH levels for fluorescence-guided surgery (Table 4).
