Basic Metabolic Panel (BMP) Explained: Glucose, Electrolytes & Calcium in Palm Beach County, FL

What it involves

MedlinePlus says a basic metabolic panel, or BMP, measures eight substances in your blood and gives information about your fluid balance, your metabolism, and how well your kidneys are working. It is often used to check general health. It is sometimes called a chem 7, a chemistry panel, or an electrolyte panel, so the same test can arrive under several names.

Who this is for

• Patients who saw BMP, chem 7, or electrolyte panel on a lab report and want to know what it covers
• Patients taking regular medicines for blood pressure or kidney health who need repeat monitoring
• Patients with diabetes who want to understand the glucose line on their results
• Patients with long-lasting fatigue, vomiting, or confusion that their provider wants to investigate

What to expect

• A review of your symptoms, your medicines, and any earlier panel results
• A blood draw from a vein in your arm, with fasting only if your provider asks for it
• Each of the eight results explained, in plain words and in the order they appear
• A plan for follow-up tests if any number needs a closer look

The eight results, one by one

MedlinePlus lists what a BMP includes:

• Glucose, your blood sugar, where a high level may be a sign of diabetes
• Calcium, a mineral needed by your nerves, muscles, heart, and blood clotting
• Sodium, potassium, carbon dioxide, and chloride, which are electrolytes that help control fluids and acid-base balance
• BUN and creatinine, waste products that your kidneys remove from the blood

What electrolytes do

MedlinePlus describes electrolytes as electrically charged minerals that help control the amount of fluid and the balance of acids and bases in your body, move nutrients into cells and waste out, and help your nerves, muscles, heart, and brain work well. That is why a provider checks them when you have been vomiting for a long time, feel confused, or are taking medicines that can shift fluid balance. Sodium and potassium are among the electrolytes that matter after a bout of vomiting or diarrhea, which is why the stomach flu and dehydration guide stresses replacing electrolytes as well as water. Low sodium, potassium, or calcium can make muscle cramps more likely, and the muscle cramps guide explains when a provider checks those levels.

BMP versus CMP

MedlinePlus says a comprehensive metabolic panel, or CMP, includes the same eight tests plus six more that measure proteins and liver enzymes: albumin, total protein, ALP, ALT, AST, and bilirubin. A provider may order a CMP instead of a BMP to get a fuller picture of your organs or to look for liver disease. The liver function tests guide explains those extra lines.

Why it is ordered

A BMP is often part of a regular checkup, which MedlinePlus says can help a provider find problems before there are symptoms. It may also be ordered if you have general symptoms such as long-lasting fatigue, confusion, breathing problems, or vomiting, or if you are being monitored for a chronic condition such as high blood pressure or kidney disease. The hypertension visit is one place this panel is commonly reviewed. A panel like this can show the effects of dehydration from ongoing diarrhea, as the persistent diarrhea guide notes among the tests a provider may use.

Fasting and preparation

MedlinePlus says you may need to fast for eight hours before the test, and that there is very little risk from a blood draw beyond slight pain or bruising at the needle site. Fasting depends on what else was ordered on the same sample, so ask before you come in. The fasting blood work preparation guide explains what is usually allowed while you wait.

What the results mean in practice

MedlinePlus says that if any result or combination of results is not normal, it could point to several conditions, including kidney disease, breathing problems, and complications of diabetes, and that more tests are usually needed to confirm or rule one out. Your provider reads the panel alongside your symptoms, history, and other tests. Kidney-specific numbers such as GFR are covered in the kidney function tests guide.

Sources

• MedlinePlus — Basic Metabolic Panel (BMP)