Hormone levels vary throughout the day so fluctuations may be missed in serum or saliva samples and 24-hour urine levels allow the quantification of the production of hormones and their metabolites over an entire day. Reference ranges are reported for females at different stages of the monthly cycle and post-menopause and separately for males. Includes sex, adrenal hormones, hormone metabolites, thyroid hormones (T4 & T3) and Human Growth Hormone.