Hormones
This category collects all articles related to hormone testing and endocrine evaluation. Each article describes what the test measures, why and when it is ordered (including special sample timing such as fasting or morning draws), how the sample is collected, typical reference ranges, and common causes and clinical signs of abnormal results—written simply for patients, students, and healthcare professionals.
FT3 (Free Triiodothyronine) Test – Normal Range, Function, and Causes of High & Low Levels
The FT3 (Free Triiodothyronine) test measures the active thyroid hormone in your blood. It helps diagnose thyroid disorders such as...
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IGF-1 Test: Growth Hormone Marker, High/Low Levels & Symptoms
IGF-1 test helps diagnose growth disorders, acromegaly, gigantism, and GH deficiency. Learn functions, causes of high/low levels, symptoms, and reference...
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Prolactin (PRL) Test – Function, Normal Range, and Causes of High & Low Levels
The Prolactin test measures the level of prolactin hormone in the blood. It helps evaluate fertility, menstrual irregularities, and pituitary...
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Estradiol (E2) Blood Test – Normal Range, Function, and Hormonal Importance
The Estradiol (E2) blood test measures estrogen levels in the blood to assess fertility, menstrual health, and hormone balance. It...
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17-OHP (17-Hydroxyprogesterone) Test – Meaning, Function, Normal Range, and Clinical Importance
The 17-OHP (17-Hydroxyprogesterone) test measures a hormone produced by the adrenal glands and gonads. It helps diagnose congenital adrenal hyperplasia...
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Metanephrines Plasma Test: Purpose, Normal Range, Symptoms & Tumor Detection
Learn what the Metanephrines Plasma Test measures, causes of high levels, symptoms, ranges, preparation, and when to seek medical care.
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T4 (Thyroxine) Test – Normal Range, Function, Causes of High & Low T4 Explained
The T4 (Thyroxine) test measures the level of thyroid hormone in the blood to assess thyroid function. Learn about normal...
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FSH (Follicle-Stimulating Hormone) Test – Normal Range, Function, and Causes
The FSH test measures the Follicle-Stimulating Hormone level in the blood. It helps assess fertility, menstrual cycle disorders, and pituitary...
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FT4 (Free Thyroxine) Test – Normal Range, Function, Symptoms, and Complete Guide
The FT4 test measures the free thyroxine hormone level in your blood. It helps detect thyroid disorders like hypothyroidism and...
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ADH (Antidiuretic Hormone) Test: Purpose, Normal Range & High/Low Causes
The ADH test measures antidiuretic hormone (vasopressin) levels to assess water balance, blood pressure, and kidney function in conditions like...
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Androstenedione Test – Purpose, Function, Normal Range, and Results
The Androstenedione Test measures a steroid hormone that acts as a precursor to testosterone and estrogen. It helps detect hormone...
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LH (Luteinizing Hormone) Test – Normal Range, Function, and Fertility Role
The LH test measures luteinizing hormone levels in the blood. It helps evaluate fertility, menstrual disorders, and pituitary or gonadal...
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