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Hemoglobin is the oxygen taxi inside your red blood cells. The complete blood count also shows how your immune cells and platelets look on that day.

A single snapshot of blood sugar after a night without food. It reacts fast to sleep, stress and last night's dinner.

The three-month average of your blood sugar. Much harder to fool than a single fasting test.

The headline number of your lipid panel. On its own it says little — it's the split between HDL, LDL and triglycerides that carries the story.

Often called the 'return traffic' lipoprotein. It tends to rise with regular aerobic movement.

The lipoprotein most studied in cardiovascular research. Targets differ a lot by personal risk, which only your professional can set.

The most habit-sensitive lipid. Alcohol, refined sugar and a short fasting window all show up here.

A liver and muscle enzyme. A hard training session in the days before the test can lift it on its own.

More liver-specific than AST. It's one of the markers most linked to fat stored inside the liver.

A sensitive liver enzyme that reacts strongly to alcohol and to some medications.

An estimate of how well your kidneys filter. Muscle mass, hydration and creatine supplements can all shift it.

The pituitary's message to your thyroid. It's a first-line screening marker for energy, temperature and metabolism questions.

Behaves more like a hormone than a vitamin. Latitude, skin tone, indoor life and season all move it.

Central to nerve function and red blood cell production. Plant-based eaters and some medication users watch it more closely.

Your iron storage tank — and also an inflammation marker, so it can read high when your body is dealing with something else.