Bile Acids

Serum Plasma
Optimal Result: 0 - 10 umol/L.

Bile acids are a group of molecules produced by the liver from cholesterol and play a vital role in the digestion and absorption of fats and fat-soluble vitamins in the small intestine. They are components of bile, a fluid that is released into the intestines to help break down fats. A lab panel can measure the levels of bile acids in the blood, which is an important marker for assessing liver function and health. Elevated levels of bile acids in the blood can indicate liver disease or conditions that impair bile flow, such as cholestasis. This is because when the liver is damaged or the bile ducts are blocked, bile acids can accumulate in the liver and spill into the bloodstream. On the other hand, lower levels might be seen in certain conditions affecting the production of bile acids. Therefore, measuring bile acids can help diagnose and monitor liver diseases, evaluate the severity of liver dysfunction, and guide treatment decisions. This test is particularly useful in diagnosing and monitoring conditions that affect bile acids metabolism or bile flow, providing crucial information for the effective management of liver-related disorders.

What does it mean if your Bile Acids result is too high?

The concentration of bile acids in serum is elevated in patients with many structural liver diseases, due to the inability of the liver to extract bile acids efficiently from portal blood. Metabolic liver diseases such as Gilbert disease, Crigler-Najjar syndrome, or Dubin-Johnson syndrome do not appear to cause elevated bile acid concentrations. Bile acid levels may be altered even when other liver function tests are normal and may serve as a sensitive and specific indicator of liver disease.

Intrahepatic cholestasis of pregnancy (ICP) is a temporary condition caused by maternal liver dysfunction during pregnancy. It is characterized by intense generalized pruritus (itchiness) which usually begins in the third trimester. ICP is also known as cholestatic jaundice of pregnancy, cholestatic hepatosis, icterus gravidarum, and obstetric cholestasis.

There are several laboratory tests which can be done to confirm a diagnosis of cholestasis of pregnancy, including bile acids. Maternal blood levels of bile salts are often at least three times the normal level in ICP; however, the levels may be 10 to 100 times normal. Blood tests can also reveal increased levels of other liver enzymes that indicate general liver dysfunction, such as ALT, AST, and alkaline phosphatase. While ALT/AST levels may be normal or slightly elevated, alkaline phosphatase levels are almost always higher than normal (though this may be due, in part, to the alkaline phosphatase added to the mother's blood from the placenta). However, if the liver enzymes are extremely elevated, other causes, such as viral hepatitis, should be considered. In the absence of bile acid tests, elevated ALT, AST and/or alkaline phosphatase levels in the setting of intense pruritus are generally adequate to diagnose cholestasis of pregnancy.

Though it may cause extreme discomfort, cholestasis of pregnancy is regarded as benign to the mother; however, it has been widely established that ICP poses a significant increased risk to the fetus and is associated with an increased incidence of stillbirth. Fetal death in ICP is a real risk and the primary objective of treatment is to make certain that the baby is born before stillbirth occurs. While the fetal death rate for untreated patients is around 10%, studies in which patients are induced before term have found fetal mortality rate to be 0% to 2%. The danger from ICP is eliminated when the child is safely delivered and labor is induced when the fetus' lungs are mature, regardless of any other test results.

After delivery, the symptoms in the mother usually decrease within 48 hours of delivery and disappear completely within four weeks postpartum. Cholestasis of pregnancy does not cause permanent liver impairment to the mother and the liver returns to normal function, once the baby is delivered.

Frequently asked questions

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