In women with regular menstrual cycles, it is suggested not to routinely measure midluteal serum progesterone levels (Hull et al., 1982).	Conditional ⊕○○○
In women investigated for infertility, endometrial biopsy for histological examination is not recommended in the absence of other indications (Coutifaris et al., 2004; Edi-Osagie et al., 2004).	Strong ⊕⊕○○