PLOD1 and Infertility: Using LASSO regression with 10-fold cross-validation (optimal λ = 0.576), we identified eight non-zero coefficient predictors: (1) infertility etiology, (2) baseline LH levels, (3) number of MII oocytes, (4) uterine cavity volume, (5) endometrial blood flow grading, (6) subendometrial flow index (FI) from 3D-PDA, and (7–8) endometrial and subendometrial PI from CEUS (Figures 1, 2).