Bicarbonate concentration in blood (serum/plasma)

What bicarbonate does in your body

Bicarbonate is a critical buffer in your blood, working alongside carbon dioxide and oxygen to keep your body’s pH stable. It helps prevent dangerous shifts in acidity that can occur due to conditions like diabetes, kidney disease, or respiratory issues. Your kidneys and lungs work together to maintain normal bicarbonate levels, but this test gives you a snapshot of your current balance.

Why this test might be ordered

Doctors may order a bicarbonate test if you have symptoms like fatigue, confusion, or unusual breathing patterns. It’s also used to diagnose or monitor conditions such as metabolic acidosis or alkalosis, kidney problems, or certain types of heart disease. Sometimes, it’s checked alongside other blood tests to assess overall acid-base balance.

What to expect before the test

No special preparation is usually needed, but you may be asked to fast for a few hours before the test if it’s part of a broader blood panel. On the day of the test, avoid smoking or drinking alcohol for at least 30 minutes before your blood draw, as these can affect your blood chemistry.

What happens during the test

A healthcare provider will insert a small needle into a vein in your arm to draw a blood sample. The process is quick and typically causes only minor discomfort. The blood is then sent to a lab for analysis.