PLOD1 and disseminated peritoneal leiomyomatosis: In order of increasing invasiveness, the methods used to diagnose LPD include the diagnosis of a shortened luteal phase based on the length of the menstrual cycle, the basal body temperature (BBT) graph, or urine LH surge kits, the measurement of progesterone derivatives in urine, the measurement of single or multiple serum progesterone levels, as well as an endometrial biopsy [7].