PLOD1 and Infertility: The increase in serum LH level among the V‐LH carriers (AG+GG genotypes) compared to the WT‐LH homozygotes (AA‐genotype) in the infertility patient group (5.0 ± 2.3 vs. 4.2 ± 2.0 IU/L; Mann–Whitney U‐test, p = 0.00017) was more pronounced compared to the young men cohort (4.2 ± 1.5 vs. 4.0 ± 1.7 IU/L; p = 0.035) (Fig. 2).