The most frequently performed tests in the assessment of fertility include both hormones directly regulating the function of the ovaries (FSH, LH), hormones secreted by the ovaries (oestradiol, testosterone, progesterone) and hormones not directly related to the function of the ovaries but capable of affecting fertility (prolactin, TSH). Determining the level of hormones sometimes allows to detect the cause of fertility problems and easily eliminate it (e.g. adjusting the level of prolactin), or e.g. determine whether there was ovulation during the cycle (determination of progesterone level in the second phase of the cycle). Specific hormonal determinations should always be performed after medical consultation.
All determinations are made from serum, for most of them you don’t need to be on an empty stomach, but usually the day of the cycle is important.