Liver function tests are used to check levels of certain enzymes and proteins in the bloodstream. While some enzymes and proteins indicate that the liver is working correctly, others are a sign that the liver is damaged or affected by a disease. In the simplest terms, liver function tests are used to measure how well the liver is doing its job.

Liver function tests are performed when a healthcare professional suspects an issue with the liver. Symptoms such as lack of appetite, yellowing skin or eyes, unexplained nausea or vomiting, and persistent fatigue are indicative of liver problems. In addition, if you have a family history of liver disease, drink often, or have alcohol use disorder, your liver is at a higher risk of damage. Other risk factors for liver problems include gallbladder disease, anemia, certain medications, diabetes, and obesity.

If the doctor assesses your health history and determines that a high risk of liver damage is present, liver function tests will be recommended to ensure the organ is working well. In addition, if you have been diagnosed with a liver condition, liver function tests are performed to observe how well treatment is working and whether your condition is progressing.

Liver function tests are performed by drawing a small blood sample from the arm. This process is quick and easy; you will feel a small pinch as the needle goes in and will be good to go shortly after. Next, the sample will be examined in a lab. The lab technician will look for high levels of certain enzymes and proteins, such as ALT, ALP, AST, bilirubin, and GGT, as this can indicate liver damage. Additionally, low levels of albumin and globulin can also indicate that there is a problem with the liver’s function.

If your results are abnormal, the doctor will contact you to let you know. They will also recommend additional screenings to accurately diagnose the root of the problem. On its own, a liver function test cannot tell if you have a specific condition. While liver function tests are highly useful for determining whether the health of this organ should be further investigated, other screenings will be needed to make a complete diagnosis.

Liver function tests are used for a variety of reasons, such as:

• Assessing liver function: With a liver function test, healthcare providers can identify whether the liver is producing enough enzymes and proteins as well as cleaning the blood properly.

• Determining the severity of liver problems: Liver function tests provide insights into how advanced liver disease is.

• Observing medication side effects: Certain medications, such as antibiotics, NSAIDs and anti-seizure drugs, can have negative effects on the liver. If you are prescribed one of these medications, your doctor may perform liver function tests periodically to ensure your liver continues to function well.

• Monitoring liver disease progression: If you’ve been diagnosed with liver disease, this screening is used to assess how well you are responding to treatment and whether your liver’s function has improved.

In summary, liver function tests are used to determine the presence of liver damage or disease. If you have a family history of liver conditions, drink alcohol often, or are experiencing symptoms of liver issues, your doctor will recommend this screening.

Properly preparing for your liver function test is essential to ensure the results are accurate. As some foods and medications can affect the results, you will be asked to fast for some time before the test. The fasting window is typically between 10 and 12 hours.

In addition to avoiding eating or drinking before your appointment, you should arrive on time and wear comfortable clothing for a blood draw from your arm. If you have any questions on how to prepare for your appointment, our team is here to provide guidance. The dedicated providers at Inspire Medical Group of California offer care for individuals with and without insurance. Our goal is to make routine preventive care as accessible as possible to the valued patients in our community. If you have any questions or need support with the insurance billing process, our staff are happy to help. We serve patients in the Bay Area from Sunnyvale, CA, San Jose, CA, Los Altos CA, Santa Clara CA to Cupertino CA, and beyond.