Your blood carries a running report on your health. Here we decode the everyday blood tests — from cholesterol and blood sugar to thyroid, iron and kidney markers — in plain English, so you know what each number really means.
Lipoprotein(a) — often written Lp(a) and said out loud as “L-P-little-a” — may be the most important heart-health number you have never had measured. You can eat well, exercise, never smoke, and get a cholesterol result your doctor calls “normal” — and still carry a hidden, inherited risk to your heart. The reason is simple…
PSA levels are among the most talked-about — and most misunderstood — numbers in men’s health. PSA stands for prostate-specific antigen, and a raised result can set off real alarm, because in most people’s minds the test is tied directly to prostate cancer. But here is the single most important thing to know before you…
Haemoglobin is the iron-rich protein packed inside your red blood cells that carries oxygen from your lungs to every tissue in your body — and it is one of the most useful single numbers on any blood test. (You will also see it spelled hemoglobin, the American version of the same word.) When it runs…
Sodium is the electrolyte everyone links with salt — and that link causes one of the most common misunderstandings in all of blood testing. When your sodium level comes back high or low, most people assume it reflects how much salt they have been eating. It almost never does. Your blood sodium is really a…
Bilirubin is the yellow pigment behind one of medicine’s most visible signs: jaundice, the yellowing of the skin and eyes. It is made constantly, as a natural by-product of your body recycling worn-out red blood cells, and in normal amounts it is simply cleared away by your liver. So when bilirubin shows up as high…
Albumin is the most abundant protein in your blood, and although it rarely gets a headline of its own, it turns up on almost every routine blood panel. It is made entirely by your liver, and it does two quietly essential jobs: it keeps fluid where it belongs, inside your blood vessels, and it ferries…
A D-dimer is one of those blood tests that is most useful precisely when it comes back normal. It measures a tiny protein fragment that appears whenever a blood clot forms and then breaks down in your body — so a raised level can be an early clue that a clot is present somewhere. But…
An ESR — short for erythrocyte sedimentation rate — is one of the oldest blood tests still in everyday use, and one of the most misunderstood. It does not diagnose any single disease. Instead, it is a simple, sensitive flag for inflammation somewhere in the body, measured in the most low-tech way imaginable: by watching…
Iron studies can look baffling: a cluster of results — serum iron, transferrin, TIBC, saturation, ferritin — that seem to pull in different directions. But they’re designed to be read together, and as a group they tell a clear story about whether your body has too little iron, too much, or just enough. This guide…
Albumin levels rarely make headlines, but this single protein quietly keeps your blood where it belongs and ferries vital cargo around your body. Albumin is the most abundant protein in your blood, made entirely by your liver. When its level drops, fluid can leak out of your blood vessels and pool in your tissues —…