Side-by-side comparisons
Some of the most common hormone questions are really about the difference between two similar things — two tests, two conditions, or two treatments that are easy to confuse. These guides lay the options out side by side, in plain language, so you can see what actually distinguishes them and why it matters.
Browse comparisons
Hypothyroidism vs Hyperthyroidism: Key Differences
A plain-language comparison of hypothyroidism and hyperthyroidism: what each is, how underactive and overactive thyroid differ, and their symptoms.
Hashimoto's vs Hypothyroidism: How They Differ
A clear comparison of Hashimoto's thyroiditis and hypothyroidism: what each term means, how a cause differs from a state, and how the two relate.
Graves' Disease vs Hyperthyroidism Compared
A plain-language comparison of Graves' disease and hyperthyroidism: how a specific cause differs from an overactive thyroid state, and how they relate.
T3 vs T4: Thyroid Hormones Compared
A clear comparison of T3 and T4, the two main thyroid hormones: what each does, how they differ in activity and abundance, when each matters, and more.
TSH vs Free T4: What Each Tells You
A plain-language comparison of TSH and free T4 thyroid tests: what each measures, how a pituitary signal differs from a thyroid output, and how they relate.
Free vs Total Testosterone: What the Difference Means
A plain-language comparison of free and total testosterone — what each measures, how they relate, when each matters, and how a lab reports them side by side.
Estradiol vs Estrone vs Estriol: The Three Estrogens
A clear comparison of the three main estrogens — estradiol, estrone, and estriol — what each does, when each dominates across life, and how labs measure them.
DHEA vs DHEA-S: How the Two Forms Differ
A plain-language comparison of DHEA and DHEA-S — how the two adrenal hormones relate, why DHEA-S is the more stable measurement, and when each one matters.
Cortisol: Blood vs Saliva Testing Compared
A plain-language comparison of blood and saliva cortisol testing — what each sample measures, when each is used, the role of timing, and how they relate.
Menopause vs Perimenopause: What Is the Difference?
A clear, side-by-side look at perimenopause and menopause — what each term means, how they differ, when each one matters, and how the two relate over time.
Type 1 vs Type 2 Diabetes: How They Differ
A plain-language, side-by-side comparison of type 1 and type 2 diabetes — what each is, how they differ, when the distinction matters, and how the two relate.
Bioidentical vs Synthetic Hormones: The Difference
A neutral, side-by-side look at what bioidentical and synthetic hormones mean, how the terms are used, and what molecular structure does and doesn't tell you.
Primary vs Secondary Hypogonadism Compared
A clear comparison of primary and secondary hypogonadism — where each begins, how testosterone, LH, and FSH patterns differ, and why it matters.
Oral vs Transdermal Estrogen: A Comparison
A neutral comparison of oral and transdermal estrogen — how each route enters the body, how they differ, and questions clinicians weigh when choosing.
Levothyroxine vs Natural Thyroid Extract Compared
A neutral comparison of levothyroxine and natural thyroid extract — what each contains, how they differ in T4 and T3 content, and what clinicians weigh.
Estrogen vs Progesterone: How They Differ
A clear comparison of estrogen and progesterone — what each hormone does, how they shift across the menstrual cycle, and why they pair together.
Saliva vs Blood Hormone Testing Compared
A plain-language comparison of saliva and blood hormone testing — what each sample type measures, how they differ in standardization, and when each is used.
AMH vs FSH for Ovarian Reserve Explained
A plain-language comparison of AMH and FSH for ovarian reserve — what each hormone reflects, how timing differs, and why clinicians often use both.
Fasting vs Random Glucose Testing Compared
A plain-language comparison of fasting and random glucose tests — what each measures, why preparation differs, and how they fit into blood sugar evaluation.
Cushing's vs Addison's Disease Compared
A plain-language comparison of Cushing's syndrome and Addison's disease — two opposite cortisol disorders, how their features differ, and how testing differs.
Hashimoto's vs Graves' Disease: How They Differ
A clear comparison of Hashimoto's thyroiditis and Graves' disease: two autoimmune thyroid disorders that push thyroid function in opposite directions.
Hyperthyroidism vs Hyperparathyroidism: Key Differences
A clear comparison of hyperthyroidism and hyperparathyroidism: two similar-sounding conditions involving different glands, hormones, and body systems.
DHEA vs Testosterone: How These Hormones Differ
A clear comparison of DHEA and testosterone: where each comes from, how they relate as precursor and active hormone, and how the two tests differ.
IGF-1 vs Growth Hormone: How They Differ
A clear comparison of IGF-1 and growth hormone: how the pituitary signal and its downstream messenger relate, and why each is measured differently.
Progesterone vs Progestin: How They Differ
A clear comparison of progesterone and progestin — what the natural hormone does, how lab-made progestins relate to it, and why the terms differ.
Insulin vs Glucagon: How They Differ
A clear comparison of insulin and glucagon — the two pancreatic hormones that balance blood sugar, how they oppose each other, and why both matter together.
Cortisol vs Cortisone: How They Differ
A clear comparison of cortisol and cortisone — two closely related steroid molecules, how the body converts between them, and why the names cause confusion.
Vitamin D2 vs D3: How They Differ
A clear comparison of vitamin D2 and D3 — where each form comes from, how the body processes them, and why both are grouped under the name vitamin D.
Sources
- MedlinePlus (U.S. National Library of Medicine). Hormones. https://medlineplus.gov/hormones.html
- MedlinePlus. How to Understand Your Lab Results. https://medlineplus.gov/lab-tests/how-to-understand-your-lab-results/