Hormone Panel
Hormone tests measure levels of substances that regulate metabolism, growth, reproduction, and stress responses. Deviations from normal ranges may explain fatigue, weight changes, menstrual irregularities, and other symptoms.
Disclaimer. Many hormones follow circadian and cyclical rhythms — timing and conditions of blood collection are critical.
Thyroid Function
Thyroid hormones control metabolic rate:
- TSH — primary screening test for thyroid function
- Free T3 — active form of thyroid hormone
- Free T4 — main hormone produced by the thyroid gland
Metabolic Hormones
- Insulin — regulates glucose; elevation may indicate insulin resistance
- Cortisol — "stress hormone"; evaluates adrenal function
Reproductive Hormones
- Testosterone — primary androgen; important for both men and women
- Estradiol — main estrogen; regulates menstrual cycle
- Prolactin — involved in lactation; elevation may cause cycle disorders
Vitamins and Micronutrients
While not technically hormones, these markers are often included in extended hormone-metabolic profiles:
- Vitamin D — regulates calcium absorption and immunity
- Vitamin B12 — essential for blood formation and nervous system
- Folate — important when planning pregnancy
When Ordered
- Fatigue, unexplained weight gain or loss
- Menstrual irregularities, infertility
- Suspected diabetes or insulin resistance
- Monitoring thyroid hormone therapy
- Symptoms of vitamin D deficiency (weakness, bone pain)
Preparation
- TSH, insulin, sex hormones — usually fasting, morning (7–10 AM).
- Cortisol — strictly morning (7–9 AM), at rest.
- Prolactin — avoid stress and physical exertion before collection.
- Tell your doctor about menstrual cycle phase (for women) and medications.
See also: Biochemistry Panel · Biomarker Catalog