How Do Doctors Diagnose Hormone Imbalance?

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Article: How Do Doctors Diagnose Hormone Imbalance?  |  Category: Hormone  |  Authored by: Brian Lamkin, DO

The Standard Hormone Workup Is Incomplete

A patient calls her primary care physician about fatigue, weight gain, hair thinning, and loss of libido. The physician orders TSH and maybe an estradiol level. Both come back "in range." She is told her hormones are fine. This scenario plays out thousands of times daily across the country, and it fails patients for a predictable reason: hormones function as a network, and testing one or two markers in isolation does not evaluate the network. TSH may be normal while Free T3 is low and Reverse T3 is elevated. Total testosterone may be normal while free testosterone is deficient because SHBG is elevated. Estradiol may be in range while progesterone is severely low, producing a ratio-driven dysfunction that neither individual level reveals. The standard workup is not wrong. It is incomplete.

The Full Thyroid Panel

Thyroid evaluation in conventional medicine usually consists of TSH alone, occasionally with Free T4. In functional medicine, we evaluate the full thyroid network: TSH, Free T3 (the metabolically active hormone), Free T4 (the storage form), Reverse T3 (the inactive mirror-image of T3 that blocks T3 receptor binding), TPO antibodies, and thyroglobulin antibodies. A patient with normal TSH, normal Free T4, low Free T3, and elevated Reverse T3 has cellular hypothyroidism that conventional testing completely misses. A patient with normal TSH but elevated TPO antibodies has Hashimoto's thyroiditis that will progressively destroy the gland if not identified. The full panel takes 5 minutes to order and changes the clinical picture in roughly 30 to 40 percent of patients who have been told their thyroid is "normal."

Total vs Free: Why It Matters

Hormones circulate in the bloodstream in two forms: bound to carrier proteins (primarily SHBG for sex hormones, and albumin) and free (unbound). Only the free fraction is biologically active at the tissue level^[1]. Total hormone levels reflect the sum of bound and free. A man with total testosterone of 550 ng/dL (solidly in range) but SHBG of 80 nmol/L (significantly elevated) may have free testosterone that is functionally deficient. His tissue-level testosterone exposure is low despite a normal total. He has every symptom of low testosterone, but the total level provides false reassurance. This is why every hormone evaluation at The Lamkin Clinic includes both total and free fractions alongside SHBG.

SHBG: The Most Under-Ordered Hormone Test

SHBG (sex hormone-binding globulin) is a protein produced primarily by the liver that binds testosterone and estradiol, making them biologically unavailable^[2]. It is perhaps the single most clinically useful hormone marker that is rarely ordered. SHBG is elevated by liver disease, hyperthyroidism, oral estrogen therapy (including oral contraceptives), aging, low caloric intake, and genetic variation. It is reduced by obesity, insulin resistance, hypothyroidism, and androgen excess. SHBG determines how much of the total testosterone and estradiol is actually available to tissues. Without SHBG, the total levels are uninterpretable in meaningful clinical context.

The Sex Hormone Panel for Women

Comprehensive female hormone evaluation includes estradiol (the primary estrogen), progesterone (drawn on cycle day 19 to 21 in premenopausal women to confirm ovulation and assess luteal phase adequacy), total and free testosterone, SHBG, DHEA-S, LH, and FSH. The ratio of estradiol to progesterone is often more clinically significant than either level alone. Estrogen dominance^[3] is defined by this ratio: adequate or elevated estradiol combined with low progesterone produces symptoms that neither hormone level in isolation would explain. Progesterone deficiency causes PMS, irregular cycles, heavy bleeding, anxiety, sleep disruption, and weight gain, and it is missed entirely if progesterone is not tested or not drawn at the correct time in the cycle.

The Sex Hormone Panel for Men

Comprehensive male hormone evaluation includes total testosterone, free testosterone (calculated or equilibrium dialysis, not the less accurate analog assay), SHBG, estradiol (essential for evaluating testosterone-to-estrogen conversion via aromatase), DHEA-S, LH, FSH, and prolactin^[4]. LH and FSH distinguish primary hypogonadism (testicular failure, with elevated LH/FSH) from secondary hypogonadism (pituitary or hypothalamic dysfunction, with low or inappropriately normal LH/FSH). This distinction changes treatment entirely. Estradiol in men matters because elevated estradiol from excessive aromatase activity (common with abdominal adiposity) produces symptoms that overlap with low testosterone: fatigue, gynecomastia, reduced libido, and mood changes. Testing estradiol alongside testosterone identifies whether the problem is testosterone production, binding, or conversion.

Adrenal Hormones: The Stress Layer

Hormones do not operate in isolation. The adrenal axis directly influences sex hormone production and thyroid function. Elevated cortisol from chronic stress suppresses GnRH (reducing LH and FSH, which reduces testosterone and progesterone production), interferes with thyroid hormone conversion, and drives insulin resistance (which lowers SHBG and alters sex hormone ratios). A patient with cortisol dysregulation who is only evaluated with sex hormone levels will appear to have a sex hormone problem, but the root cause is adrenal. Four-point salivary cortisol or DUTCH testing, along with DHEA-S for adrenal reserve, should be part of every comprehensive hormone evaluation.

Insulin and Hormones: The Metabolic Intersection

Insulin resistance directly disrupts hormonal function. In women, hyperinsulinemia drives ovarian androgen production (the mechanism behind PCOS), reduces SHBG (increasing free testosterone and producing acne, hirsutism, and hair loss), and impairs ovulation. In men, insulin resistance lowers SHBG but also increases aromatase activity in visceral fat (converting testosterone to estradiol and producing the paradox of low free testosterone with elevated estradiol). This is why fasting insulin and HOMA-IR are part of the hormone evaluation at The Lamkin Clinic. A patient whose hormonal dysfunction is driven by insulin resistance will not respond to hormone replacement without addressing the metabolic root cause.

Timing and Methodology

Hormone levels are not static. They vary by time of day, day of menstrual cycle, recent meals, recent exercise, and stress. For accurate results: testosterone should be drawn in the morning (before 10 AM) when levels peak, fasting; progesterone in premenopausal women should be drawn on cycle day 19 to 21 (mid-luteal phase); cortisol follows a diurnal pattern best captured by multi-point salivary or urine testing; thyroid markers can be drawn any time but should be drawn before taking thyroid medication on the day of testing. Methodology matters too: free testosterone by equilibrium dialysis is the gold standard but expensive; calculated free testosterone from total testosterone and SHBG is acceptable; analog free testosterone assays are unreliable and should be avoided.

Why Conventional Medicine Tests Less

Conventional medicine restricts hormone testing for several understandable reasons: laboratory cost, insurance coverage limitations, reference ranges that classify most results as "normal" and therefore not actionable, and training that emphasizes disease detection over optimization. A conventional physician follows the guideline: if TSH is in range, the thyroid is fine. If total testosterone is above the lower limit, the patient does not have hypogonadism. This framework works for detecting severe deficiency (overt hypothyroidism, frank hypogonadism) but fails to identify the subclinical, optimization-oriented dysfunction that functional medicine patients are seeking help with. Neither approach is wrong. They are answering different clinical questions.

The Lamkin Clinic Approach

Every hormone evaluation at The Lamkin Clinic includes the full network: complete thyroid panel (TSH, Free T3, Free T4, Reverse T3, TPO antibodies), sex hormones (total and free testosterone, estradiol, progesterone, SHBG, LH, FSH, prolactin), adrenal markers (4-point cortisol, DHEA-S), and metabolic intersection (fasting insulin, HOMA-IR). Each marker is interpreted within functional optimal ranges rather than standard reference ranges, and in the context of the full panel rather than in isolation. This approach identifies the pattern, and the pattern determines the treatment. A patient whose symptoms are driven by SHBG elevation requires a different intervention than a patient whose symptoms are driven by cortisol-mediated LH suppression, even if both present with the same complaints. The workup distinguishes them.

The Lamkin Clinic, Edmond Oklahoma | lamkinclinic.com

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References and Further Reading

1. [1]Vermeulen A, et al. A critical evaluation of simple methods for the estimation of free testosterone in serum. J Clin Endocrinol Metab. 1999;84(10):3666-3672.
2. [2]Ding EL, et al. Sex hormone-binding globulin and risk of type 2 diabetes in women and men. N Engl J Med. 2009;361(12):1152-1163.
3. [3]Prior JC. Progesterone for the prevention and treatment of osteoporosis in women. Climacteric. 2018;21(4):366-374.
4. [4]Mulhall JP, et al. Evaluation and management of testosterone deficiency: AUA guideline. J Urol. 2018;200(2):423-432.