What causes lft to increase

Overview

Liver Function Tests (LFTs), also known as hepatic function panel or liver panel, are a group of blood tests that provide information about the state of a person's liver. They measure the levels of certain enzymes, proteins, and other substances in your blood that are produced or processed by the liver. When these levels are outside the normal range, it can indicate that the liver is not functioning as it should, or that there might be damage or inflammation present. An increase in one or more of these LFT markers is often referred to as an 'elevated' or 'increased' LFT.

What do LFTs measure?

Commonly measured components in an LFT panel include:

• Alanine transaminase (ALT): An enzyme found mostly in the liver. Elevated levels suggest liver damage.
• Aspartate transaminase (AST): An enzyme found in the liver, heart, muscles, and other tissues. Elevated levels can indicate liver damage, but also muscle damage or heart problems.
• Alkaline phosphatase (ALP): An enzyme found in the liver, bile ducts, and bone. High levels can indicate liver disease, bile duct obstruction, or bone disorders.
• Bilirubin: A yellow pigment produced during the breakdown of red blood cells. The liver processes bilirubin. High levels can cause jaundice and indicate liver or bile duct problems.
• Albumin: A protein made by the liver. Low levels can indicate chronic liver disease or malnutrition.
• Prothrombin time (PT) and International Normalized Ratio (INR): Measures how long it takes for blood to clot. The liver produces proteins necessary for clotting. Prolonged PT/INR can suggest impaired liver function.

Common Causes of Increased LFTs

An increase in LFTs is a signal that requires medical attention to determine the underlying cause. The liver is a resilient organ, but various factors can lead to its compromise. Here are some of the most common culprits:

1. Infections

Viral infections are a primary cause of liver inflammation, known as hepatitis. This can lead to significant elevations in ALT and AST.

• Hepatitis A: A short-term infection, often contracted through contaminated food or water.
• Hepatitis B: Can be acute or chronic, transmitted through blood, semen, and other bodily fluids.
• Hepatitis C: Primarily chronic, transmitted through blood contact.
• Other viruses: Less commonly, viruses like Epstein-Barr virus (EBV), cytomegalovirus (CMV), and herpes simplex virus (HSV) can also affect the liver.

2. Alcohol Consumption

Chronic and excessive alcohol intake is one of the most widespread causes of liver damage and elevated LFTs. Alcohol can directly damage liver cells (hepatocytes) and lead to conditions like alcoholic hepatitis or cirrhosis.

3. Medications and Toxins

The liver is responsible for metabolizing many drugs and substances. Certain medications, both prescription and over-the-counter, can cause drug-induced liver injury (DILI). This can happen even at recommended doses, but is more likely with higher doses or prolonged use.

• Common culprits include: Acetaminophen (Tylenol), certain antibiotics (like amoxicillin-clavulanate), statins (cholesterol-lowering drugs), NSAIDs (like ibuprofen), and some herbal supplements.
• Toxins: Exposure to industrial chemicals, certain mushrooms (like the death cap mushroom), and illicit drugs can also severely damage the liver.

4. Fatty Liver Disease

This is a condition where excess fat builds up in the liver. It is increasingly common and often associated with obesity, diabetes, high cholesterol, and metabolic syndrome.

• Non-alcoholic fatty liver disease (NAFLD): The most common type, not related to alcohol. It can progress to non-alcoholic steatohepatitis (NASH), which involves inflammation and liver cell damage, potentially leading to fibrosis and cirrhosis.
• Alcoholic fatty liver disease (AFLD): Caused by heavy alcohol use.

5. Chronic Liver Diseases

Conditions that persist over time can lead to ongoing liver damage and elevated LFTs.

• Autoimmune hepatitis: The body's immune system mistakenly attacks liver cells.
• Primary biliary cholangitis (PBC) and Primary sclerosing cholangitis (PSC): Diseases affecting the bile ducts.
• Hemochromatosis: A condition where the body absorbs too much iron, which can accumulate in the liver.
• Wilson's disease: A rare genetic disorder causing copper to build up in the liver, brain, and other organs.

6. Other Medical Conditions

Several other health issues can impact liver function:

• Celiac disease
• Thyroid disorders
• Heart failure (leading to liver congestion)
• Gastrointestinal conditions
• Certain cancers that have spread to the liver (metastases)

When to See a Doctor

If your LFTs are elevated, it's crucial to consult a healthcare professional. They will consider your medical history, symptoms, and perform a physical examination. Further tests may be ordered to pinpoint the cause, which could include viral hepatitis serology, auto-antibody tests, imaging studies (ultrasound, CT, MRI), or even a liver biopsy in some cases. Prompt diagnosis and management are key to preventing long-term liver damage.