IGF1 and acromegaly: The nadir GH level was 21.4 ± 39.3 ng/mL (mean ± SD, range: 1.1–214.0 ng/mL), the fasting GH level was 27.4 ± 44.6 ng/mL (range: 2.7–276.0 ng/mL), and the IGF-1 level was 802.7 ± 337.5 ng/mL (range: 144.0–1591.0 ng/mL) in the acromegaly group.