What is the fine-grained topic of the following text: More than 60 parameters are routinely measured in serum, plasma or saliva, and metabolites can be assayed in urine, including steroids (androgens, oestrogens, glucocorticoids, mineralocorticoids), peptides (ACTH, ADH, C-Peptide) and proteins (gonadotropin, prolactin, TSH, GH, HCG, insulin) for the investigation of the function of all endocrine glands, including the thyroid, the gonads, the pituitary gland, the adrenal cortex, the pancreas and the placenta. Only return the topic.
Endocrine gland function investigation through various parameter measurements in bodily fluids