Blood Chemistry Panel: What It Includes, Reference Ranges, and Interpretation

You have been handed a report where each line has numbers and unfamiliar units next to it: µmol/L, IU/L, mmol/L. It looks like a code, though each line actually represents a straightforward quantity. Let's calmly go through what is being tested and how to read the result.

What a blood chemistry panel is

Blood chemistry is a laboratory diagnostic method: a blood sample from a vein is used to assess the function of internal organs (liver, kidneys, pancreas, gallbladder), lipid, protein, and carbohydrate metabolism, and the need for trace elements. A tourniquet, antiseptic, needle, tube — the whole procedure takes about ten minutes, and the bruise fades within a few days. Results are usually ready within a few days, sometimes within a couple of weeks.

In short: this is not a "test for everything" but a set of specific measurements, each answering its own question.

Which markers are included in a comprehensive metabolic panel

A typical (comprehensive metabolic) panel measures 14 substances: glucose, calcium, sodium, potassium, bicarbonate, chloride, albumin, total protein, alkaline phosphatase, ALT, AST, bilirubin, urea, creatinine. Electrolytes regulate fluid volume and the acid-base balance, glucose provides energy, and urea and creatinine are excreted by the kidneys. It is ordered for routine checkups, for nonspecific complaints such as fatigue, for known liver and kidney disease, and to monitor treatment.

• liver and kidney function;
• glucose level;
• protein metabolism;
• water-electrolyte and acid-base balance;
• overall metabolism.

The doctor selects the panel to fit the situation, not on a "the more the better" basis.

Comprehensive vs. basic metabolic panel: what's the difference

Besides the comprehensive metabolic panel (CMP, 14 markers), there is a basic one (BMP) — 8 of the same 14. The basic panel does not include total protein, albumin, bilirubin, or liver enzymes (ALT, AST, ALP). The doctor chooses the option based on the medical history and the person's needs. A blood chemistry panel may also include other markers, such as lipase, amylase, gamma-GTP, and CRP.

A diagnosis is not made based on the number of lines on the report.

Reference ranges and interpretation of key markers

Each laboratory has its own ranges. Common reference points: glucose 3.33–5.55 mmol/L from a fingerstick, urea 2.5–8.3 mmol/L, creatinine 44–106 µmol/L, albumin 35–50 g/L, total bilirubin 8.5–20.55 µmol/L. For lipids: total cholesterol 3.6–7.8 mmol/L with a recommended level below 5, LDL in men 2.02–4.79 and in women 1.92–4.51 mmol/L, HDL — 0.72–1.63 and 0.86–2.28 mmol/L, and an atherogenic coefficient no greater than 3. Triglycerides depend on age and sex.

High glucose indicates a risk of diabetes or impaired glucose tolerance, rising urea and creatinine indicate reduced filtration in the kidneys, and high cholesterol is associated with the risk of atherosclerosis. But a single out-of-range number is not a diagnosis: the doctor looks at all the results together, takes into account the history and medications, and orders further tests if needed.

Liver chemistry: what is looked at

ALT (7–41 IU/L) is considered a liver enzyme, while AST (10–38 IU/L) is also used to assess the heart — it rises in myocardial infarction and muscle damage. Alkaline phosphatase and gamma-GTP (15–106 in men, 10–66 µmol/L in women) are also classified as liver markers. Albumin is synthesized in the liver and makes up about 60% of total protein, while bilirubin is formed from the breakdown of hemoglobin and is cleared by the liver: above 27 µmol/L, jaundice appears.

Liver function is judged by the combination of markers, not by a single line.

How to prepare and when to discuss results with a doctor

Preparation instructions are given by the person who wrote the referral. Before some tests, you are asked to refrain from eating and from drinking anything but water for a short time, and specific instructions are given for certain medications. If you were told nothing, ask in advance.

Results are usually reported within a few days; if there is silence after a couple of weeks, call the office or the doctor. Interpretation can be confusing, and asking for explanations is a patient's normal right.

The report itself with abnormalities is not a reason to call an ambulance. 103 or 112 is needed if a person has signs of a stroke or heart attack, a serious injury, or another life-threatening condition.

Take the results to a general practitioner or family doctor, and if glucose is abnormal, they may refer you to an endocrinologist.

And lastly, in a fatherly tone: this material is for reference and does not replace a doctor's consultation — the numbers on the report are read together with the person, not apart from them.

This content is for reference and does not replace a doctor's consultation. Medical disclaimer