Hormone Panel

The markers sort into a few groups that are read on their own terms. The reproductive set covers testosterone, free testosterone, SHBG, estradiol, progesterone, the gonadotropins LH and FSH, and the ovarian-reserve marker AMH. The adrenal set covers cortisol with its pituitary signal ACTH, the salt-and-pressure pair of aldosterone and renin, and the slow androgen DHEA-S. The panel also reports androstenedione, the in-between androgen whose elevation flags an overproducing steroid line before the finished hormones breach their ranges. An isolated pregnenolone value means little on its own and is best read inside the full set of steroid measurements this panel brings together. The growth axis pairs growth hormone with IGF-1. Then there are the loners: prolactin, which can reach over and quiet the reproductive hormones, and parathyroid hormone, which is here only to be read against calcium. The thyroid hormones, despite the overlap in language, get their own thyroid panel rather than a seat on this one.

What follows are the combinations that carry meaning, the reason none of these numbers is read as a solitary flag.

Several of these hormones are moving targets, and reading them ignores that at your peril. Cortisol follows a daily curve, which is why its draw time is fixed rather than incidental. The reproductive hormones answer to the calendar instead: estradiol, progesterone, and LH all shift across the menstrual cycle, so the same estradiol can be ordinary early in the cycle and unusual a week later. That is why estradiol and FSH are often drawn together near the start of the cycle, while the estradiol-and-progesterone handoff is read in the second half to judge whether ovulation happened. On a fertility workup the panel may also carry inhibin B, the Sertoli- and granulosa-cell signal that brakes FSH and only makes sense read against it.

The growth axis carries its own timing quirk. Growth hormone is released in bursts through the day, so a single random level is hard to read at all. IGF-1 is measured in its place because it reflects the day's average output and holds steady enough to interpret from one draw. Some hormones on this panel cannot be read at rest at all; growth hormone, for instance, is confirmed by how it moves when provoked rather than where its resting number sits.

The loners on the panel are a reminder that not every line follows the same rules. A raised prolactin can quiet LH and FSH from above, which is why it turns up in a reproductive workup that otherwise seems unrelated to it. Parathyroid hormone sits outside the sex and stress circuits altogether and is read against calcium, not against its neighbors here. One outlier on the panel is calcitonin, a hormone interpreted less as a measure of calcium and more as a surveillance flag for the thyroid's C cells.

For all its reach, the panel localizes more than it diagnoses. A pattern can point toward the gland over the pituitary, or an adrenal source over a central one, but it rarely names the cause. For anyone with signs of androgen excess, the panel often adds 17-hydroxyprogesterone, the precursor that backs up behind the enzyme missing in most congenital adrenal hyperplasia. That work belongs to imaging, repeat draws, and the conversation with your doctor. What the panel does well is sort the numbers onto the right circuits and read each against its partner and its clock.