Start from what you feel, not from a test name. Each guide takes one symptom — fatigue, hair loss, swelling — and walks through the lab tests that actually find its cause, reviewed by a doctor.
Most people don't search for "ferritin" — they search for "why am I always tired". This hub maps everyday symptoms to the blood tests worth discussing with your doctor: what each test rules in or out, in what order labs usually check things, and which results matter. It is not a diagnosis tool; it is a way to arrive at the appointment prepared.
Every guide is medically reviewed and links to our lab-test reference, so you can look up any marker's normal ranges and meanings as you read.
Seven tests that explain chronic tiredness — from iron stores to thyroid and blood sugar.
Which tests find the cause →Iron deficiency and hypothyroidism look alike — how the labs tell them apart.
Which tests find the cause →A lab checklist for hair falling out in clumps: iron, thyroid, vitamins and hormones.
Which tests find the cause →When easy bruising points to platelets, clotting or the liver — and which tests confirm it.
Which tests find the cause →Which lab tests reveal the cause of cramps: minerals, iron stores and glucose.
Which tests find the cause →B12, blood sugar or thyroid — the three usual suspects behind tingling and numbness.
Which tests find the cause →Liver, kidneys or blood? The tests that find the cause of persistent itching.
Which tests find the cause →Which deficiencies show up in nails and skin — and the tests that confirm them.
Which tests find the cause →Kidneys, protein, thyroid or veins — how lab tests narrow down the cause of edema.
Which tests find the cause →