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Concentration of hormones in blood serum and follicular fluid of women with poor ovarian response (POR) grouped into POSEIDON categories (1–4) and control women without POR during controlled ovarian stimulation for assisted reproductive technology. Testosterone (A), androstenedione (B), dehydroepiandrosterone sulfate (DHEA-S, C) and estradiol (D) were evaluated in blood serum. Panel (E) shows DHEA-S levels in follicular fluid. a ≠ b, p < 0.05; b & c ≠ d, p < 0.05.
