PLOD1 and Azoospermia: The serum LH and FSH concentrations were considerably greater in the non-obstructive azoospermia group than in the control group, with medians (IQRs) of 7.15 (4.8–14.08) (p = 0.0003) and 8.8 (5.05–24.75) (p = 0.0019), respectively.