Liver Function Test (LFT)

A Liver Function Test (LFT) is a group of blood tests that are used to evaluate the functioning of the liver. The liver is responsible for a wide range of functions including detoxification, protein synthesis, and bile production.

Pre-test preparation: There is no specific preparation required for a LFT.

Testing method: A small sample of blood is taken from a vein in your arm and sent to a laboratory for analysis. The test typically includes measurement of enzymes such as Alanine transaminase (ALT), Aspartate transaminase (AST), Alkaline phosphatase (ALP), Bilirubin, and Albumin.

Common symptoms that may prompt your doctor to order a LFT include: jaundice (yellowing of the skin and eyes), abdominal pain, and dark urine.

Diagnosis: LFTs are used to detect and monitor liver disease, such as hepatitis, cirrhosis, and liver cancer. Elevated levels of liver enzymes can indicate damage to liver cells, while low levels of albumin can indicate a problem with liver function.

Reference range: The normal range for LFTs varies depending on the laboratory that performs the test, but typical ranges for enzymes are:
ALT: 0-40 U/L
AST: 0-40 U/L
ALP

Liver function tests (LFTs) are a group of blood tests that are used to assess the health of the liver and to diagnose and monitor liver disease or damage.
Pre-test preparation typically includes fasting for 8-12 hours before the test, as well as avoiding alcohol for at least 24 hours prior to the test.
The test is typically done by drawing blood from a vein in the arm and sending it to a lab for analysis.

Common symptoms that may lead a healthcare provider to prescribe LFTs include jaundice (yellowing of the skin and eyes), fatigue, abdominal pain, and loss of appetite.
These tests can help diagnose a wide range of liver conditions including hepatitis, cirrhosis, and liver cancer.

A common set of LFTs includes:
Alanine transaminase (ALT)
Aspartate transaminase (AST)
Alkaline phosphatase (ALP)
Total bilirubin
Albumin
Prothrombin time (PT)
International normalized ratio (INR)

Reference ranges and normal values vary depending on the specific test and the lab that is performing the analysis. It’s important to consult with a healthcare provider or the lab that performed the test to understand the results and their implications.

It’s important to note that liver function tests are not definitive in diagnosing liver disease, they are just a way to screen the liver and more definitive tests like imaging and biopsy are often required. Additionally, other medical conditions can also affect the results of LFTs, so it is important to consult a healthcare professional for proper interpretation of the results.