Everything You Need to Know About Fatty Liver Testing

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Everything You Need to Know About Fatty Liver Tests

The liver is the largest internal organ in the body and plays a critical role in overall health and survival. It is the body’s primary organ for processing nutrients and eliminating waste. Blood from all over the body flows to the liver to detoxify harmful substances, including medications. The liver also produces bile, which aids digestion in the intestines and is stored in the gallbladder.

A healthy liver contains little to no fat. When consuming high-fat foods, fast food, or alcohol, the body stores some calories as fat in the liver, a condition known as fatty liver. Fatty liver occurs when the liver struggles to break down fats, leading to fat accumulation in liver tissue. This condition is considered significant when 10% or more of the liver’s weight is fat. Fatty liver tests comprise a series of examinations that help a physician diagnose the condition based on test results, medical history, and physical examination.

Due to unhealthy diets and reduced physical activity, fatty liver is increasingly common worldwide. Fatty liver disease can lead to liver inflammation (steatohepatitis) and, over time, cause liver scarring known as cirrhosis. Cirrhosis is a serious condition that can result in liver failure and, in some cases, liver cancer. Early detection of fatty liver disease is therefore essential to prevent liver damage and reduce the risk of more severe conditions.

Types of Fatty Liver and Their Symptoms

Fatty liver disease occurs when fat accumulates in the liver. The two main types are:

Non-Alcoholic Fatty Liver Disease (NAFLD):
This type is not related to alcohol consumption and has two subtypes:

Simple fatty liver: Fat is present in the liver, but inflammation or liver cell damage is minimal or absent. Simple fatty liver usually does not cause severe liver complications.
Non-alcoholic steatohepatitis (NASH): This condition involves liver inflammation, cell damage, and fat accumulation. Persistent inflammation can lead to fibrosis, cirrhosis, or even liver cancer.

Alcoholic Fatty Liver Disease:
This type results from excessive alcohol consumption. The liver metabolizes most of the alcohol consumed, but this process can generate harmful substances that damage liver cells, increase inflammation, and weaken the body’s defenses. The more alcohol consumed, the greater the liver damage. Alcoholic fatty liver is the first stage of alcohol-related liver disease, which can progress to alcoholic hepatitis and cirrhosis.

Symptoms of Fatty Liver Disease:
Fatty liver is often asymptomatic, earning the nickname “silent disease.” However, possible symptoms include:

Fatigue
Unexplained weight loss or decreased appetite
Weakness
Nausea
Confusion, difficulty concentrating, or poor decision-making

Additional signs may include:

Pain in the upper central or right abdomen
Enlarged liver

If cirrhosis develops, additional symptoms may occur:

Fluid retention
Muscle loss
Internal bleeding
Jaundice (yellowing of the skin and eyes)
Liver failure

Significant liver damage may occur before symptoms appear, making timely detection crucial. Fatty liver tests can help assess liver health early.

Who Is at Risk for Fatty Liver Disease?

The exact cause of non-alcoholic fatty liver disease is unknown. Alcohol addiction is a leading cause of fatty liver. Certain medications and metabolic disorders also contribute. Other risk factors include:

Obesity
Type 2 diabetes
High blood pressure
Certain medications (aspirin, steroids, tamoxifen, tetracycline)
Pregnancy
Toxins
Viral infections (e.g., hepatitis A)
Malnutrition
High cholesterol
Polycystic ovary syndrome (PCOS)
Hypothyroidism
Gastric bypass surgery

Fatty Liver Tests

Fatty liver tests generally involve liver function tests (LFTs), which measure enzymes, proteins, and other substances in the blood to assess liver health. Because fatty liver often shows no symptoms, diagnosis requires a combination of medical history, physical examination, blood tests, imaging, and sometimes a liver biopsy.

Liver Function Tests Include:

Alanine Aminotransferase (ALT)
Aspartate Aminotransferase (AST)
Alkaline Phosphatase (ALP)
Total Bilirubin
Albumin (ALB)
Gamma-Glutamyl Transferase (GGT)
Prothrombin Time (PT), assessing blood clotting

Imaging for Fatty Liver:

Ultrasound
CT Scan
MRI
Magnetic Resonance Elastography (MRE)
Transient elastography (FibroScan)

Liver Biopsy:
Not required for all NAFLD patients, but recommended if non-alcoholic steatohepatitis (NASH) or complications such as cirrhosis are suspected. Biopsy is the most accurate method for assessing liver inflammation and fat accumulation.