Serum LH was elevated (>97th percentile for age), between 0.2 and 8.9 IU/L, in 9 of 124 (7.3%) boys with unilateral cryptorchidism, and in 17 of 186 (9.1%) boys with bilateral cryptorchidism (Figure 3). The gene discussed is PLOD1; the disease is cryptorchidism.