<prompt> Peak level of plasma progesterone in the luteal phase:5 ngml10 ngml15 ngml30 ngml  <response>: Progesterone production and blood level Follicular phase luteal phase Production 2-3 mg 20-30 mg Serum value 1 ngml 5-15 ngml Ref: D.C. Duttas Textbook of Gynaecology, 6th edition, page no: 75 