What is a Total Bile Acids test?
This test measures the level of total bile acids in a sample of your blood. Bile acids are substances made by your liver from cholesterol. They help your body digest and absorb fats and fat-soluble vitamins from the food you eat.
Bile acids are stored mainly in the gallbladder and released into the small intestine after you eat. After helping with digestion, most bile acids are reabsorbed in the intestine and returned to the liver to be used again.
Normally, only a small amount of bile acids is present in your blood. When the liver cannot properly process or excrete bile acids, or when bile flow is blocked, bile acids can build up in the bloodstream.
A Total Bile Acids test can provide important information to help evaluate liver function, bile flow, and certain liver or biliary disorders.
Other names: Total bile acids, serum bile acids, TBA, bile acids
What is it used for?
A Total Bile Acids test may be used to help:
Evaluate liver and biliary disorders
Increased bile acid levels may occur when the liver is not functioning normally or when the normal flow of bile is impaired.
The test may be useful in evaluating conditions such as:
Hepatitis
Cirrhosis
Cholestasis
Bile duct obstruction
Gallbladder or biliary tract disorders
Other liver diseases
Help evaluate cholestasis during pregnancy
Total bile acids are particularly important during pregnancy because increased bile acids can be associated with a condition called intrahepatic cholestasis of pregnancy (ICP).
ICP can cause intense itching, often involving the palms of the hands and soles of the feet, without an obvious skin rash.
Measuring total bile acids can help healthcare providers evaluate suspected ICP and monitor the condition.
Assess bile flow
Bile acids can provide information about whether bile is moving normally from the liver through the bile ducts into the intestine.
When bile flow is reduced or blocked, bile acids may accumulate in the blood.
Monitor certain liver conditions
Repeated Total Bile Acids measurements may be used to monitor changes in bile acid levels and evaluate a patient's response to treatment, depending on the underlying condition.
Why do I need a Total Bile Acids test?
You may need a Total Bile Acids test if:
You have symptoms that may suggest a liver or bile duct problem.
You have unexplained itching, particularly during pregnancy.
Your other liver tests, such as ALT, AST, ALP, or bilirubin, are abnormal.
Your healthcare provider suspects cholestasis or impaired bile flow.
You have a known liver or biliary disorder and your provider wants to monitor your condition.
You are pregnant and have symptoms that may suggest intrahepatic cholestasis of pregnancy.
What happens during a Total Bile Acids test?
A Total Bile Acids test usually uses a sample of your blood.
During a blood test, a healthcare professional will take a blood sample from a vein in your arm using a small needle. After the needle is inserted, a small amount of blood will be collected into a test tube or vial.
You may feel a little sting when the needle goes in or out. The procedure usually takes less than five minutes.
Will I need to do anything to prepare for the test?
Your healthcare provider or laboratory may ask you to fast before the test, because bile acid levels can change after eating.
If fasting is required, you may be instructed not to eat or drink for a specified period before the blood sample is collected.
Follow the specific instructions provided by your healthcare provider or laboratory.
Are there any risks to the test?
There is very little risk to having a blood test.
You may have slight pain, bruising, or tenderness at the site where the needle was inserted. These symptoms usually go away quickly.
What do the results mean?
The meaning of your Total Bile Acids result depends on your age, symptoms, pregnancy status, fasting or post-meal status, medications, and results of other liver tests.
In general:
A high level of Total Bile Acids
A high Total Bile Acids level may indicate that bile acids are accumulating in the bloodstream. Conditions associated with increased bile acids include:
Intrahepatic cholestasis of pregnancy
Hepatitis
Cirrhosis
Cholestatic liver disease
Bile duct obstruction
Gallstones affecting bile flow
Other liver or biliary disorders
During pregnancy, an elevated bile acid level can support the diagnosis of intrahepatic cholestasis of pregnancy, especially when accompanied by typical symptoms such as itching.
A low or normal level of Total Bile Acids
A normal or low Total Bile Acids level generally indicates that bile acids are not significantly accumulating in the bloodstream at the time of testing.
However, a normal result does not always completely rule out a liver or biliary disorder. Bile acid levels can vary depending on whether the patient has eaten, the timing of the sample, and the underlying condition.
Important note
Total Bile Acids should not be interpreted by itself. Results should be evaluated together with ALT, AST, ALP, GGT, bilirubin, clinical symptoms, and other relevant investigations.
For pregnant patients with suspected intrahepatic cholestasis, the total bile acid concentration and clinical symptoms are particularly important, and repeat testing may sometimes be necessary.
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