Blood Biochemistry: Decoding and What the Test Shows

Blood biochemistry is one of the most common tests and one of the most intimidating to look at: a long column of values, arrows up and down. In fact it is a convenient "door panel" that assesses the work of the liver, kidneys and metabolism in a single test. Let's sort out what blood biochemistry shows, what is in it, and how to read the report without panicking over one arrow.

What Blood Biochemistry Shows

A biochemical blood test assesses not one system but several at once: how the liver and kidneys work, how carbohydrate and fat metabolism go, whether there is enough protein, whether electrolytes are normal. That is why it is ordered so often — it gives an overall picture and hints where to look next. No single value is read alone.

Liver Values: ALT, AST, Bilirubin

The liver is reflected by the enzymes ALT and AST, as well as bilirubin and GGT. ALT and AST rise when liver cells are damaged; bilirubin reflects liver work and bile flow. A moderate rise happens for many reasons — from medications to fatty liver disease — so the combination and trend matter, not one number.

Kidney Values: Creatinine and Urea

Kidney work is assessed by creatinine and urea, and by the estimated filtration rate. A rise in these values may point to reduced kidney function, but also depends on fluid intake, muscle mass and diet. So an isolated deviation is a reason to investigate, not a ready diagnosis.

Metabolism: Glucose, Cholesterol

Carbohydrate metabolism is reflected by glucose (diabetes risk), fat metabolism by cholesterol and its fractions (vascular risk). These values are especially important for prevention and with age. A single high glucose is not always diabetes — often a fasting retest or an additional test ordered by a doctor is needed.

Protein and Electrolytes

Total protein reflects nutrition and the work of the liver and kidneys. Electrolytes (sodium, potassium and others) matter for the heart, nerves and muscles; their deviations occur with dehydration, medications and illness. These values are also interpreted in the context of the overall condition and the rest of the report.

How to Read the Report and What to Do Next

One looks not at a single line but at the combination of values, the trend and complaints. A single "bad number" without symptoms is often not a disease but a reason to retest. If the liver specifically needs a detailed check, the article on tests to check the liver is useful. A confusing report can be uploaded for decoding — the service explains the values in plain language and suggests questions for your doctor.

Why Biochemistry Is Tested and How to Prepare

Blood biochemistry is taken for prevention, with complaints, to monitor chronic diseases and before some procedures. Most values are taken fasting, so proper preparation matters. The exact set of items and the interpretation are decided by a doctor — "testing everything" without indications is unnecessary.

This article is for informational purposes only and does not replace a doctor's consultation. Blood biochemistry values are assessed by a specialist as a whole and with the clinical picture in mind.