Liver Function Test (LFT)

If you have been advised to get a Liver Function Test (LFT) or you are searching for what it means, here is a straightforward answer. LFT is a blood test that measures several substances produced or processed by your liver. It gives your doctor a snapshot of how well your liver is working and whether there is any injury or blockage. Doctors commonly use it to screen for liver disease, monitor known conditions like hepatitis or fatty liver, or check for side effects from medications. The test itself is simple and low-risk, but understanding the results requires a doctor’s interpretation.

What Is a Liver Function Test (LFT)?

A Liver Function Test (LFT) is not a single test but a panel of blood markers that reflect different aspects of liver health. The panel typically includes:

• Liver enzymes — alanine transaminase (ALT), aspartate transaminase (AST), alkaline phosphatase (ALP), and gamma-glutamyl transferase (GGT). These enzymes leak into the blood when liver cells are damaged or when bile flow is obstructed.
• Bilirubin — total and direct bilirubin. Bilirubin is a waste product from red blood cell breakdown; high levels cause jaundice and can indicate liver or bile duct problems.
• Proteins — albumin and total protein. Albumin is made by the liver; low levels may suggest chronic liver disease.

LFT is a screening tool, not a definitive diagnosis. Abnormal results must be interpreted alongside your symptoms, medical history, and often additional tests such as ultrasound or viral hepatitis serology.

Why Does a Doctor Order an LFT?

Doctors in Bangladesh commonly order LFT for several reasons:

• Screening for hepatitis B and C — both are prevalent in Bangladesh and can cause silent liver damage.
• Evaluating fatty liver disease — non-alcoholic fatty liver disease (NAFLD) is rising due to dietary changes, obesity, and sedentary lifestyles, especially in urban areas like Dhaka.
• Monitoring alcohol-related liver injury — or checking for damage from medications such as tuberculosis drugs, paracetamol overdose, or certain antibiotics.
• Investigating symptoms — jaundice (yellow skin/eyes), dark urine, pale stools, persistent fatigue, nausea, abdominal swelling, or pain in the upper right abdomen.
• Baseline assessment — before starting medications that may affect the liver, or as part of a routine health check-up.

Understanding Your LFT Report: Key Markers and Normal Ranges

The table below lists the main components of an LFT, approximate normal ranges used by Bangladeshi labs, and what elevated levels may suggest. Remember: reference ranges vary slightly between laboratories, and results must be interpreted by a doctor.

Mild elevations of ALT (up to 2–3 times the upper limit) are common with fatty liver, which is increasingly diagnosed in Bangladesh. Even if your LFT is normal, chronic liver disease such as cirrhosis can still be present, so your doctor may recommend imaging or other tests if risk factors exist.

How to Prepare for an LFT

In most cases, no special preparation is needed for a standard LFT. However, if your panel also includes tests for triglycerides or glucose, your doctor may ask you to fast for 8–12 hours beforehand. Always inform the lab technician and your doctor about any medications you are taking (including herbal supplements), your alcohol consumption, and any recent acute illness — even a common cold can cause temporary enzyme elevations. The test involves a simple blood draw from your arm, carries minimal risk, and takes only a few minutes.

What Do Abnormal LFT Results Mean?

Abnormal LFT results are not a diagnosis on their own. They point to possible patterns that your doctor will investigate further:

• High ALT and AST — suggest liver cell injury. Causes include viral hepatitis (A, B, C), fatty liver disease, alcohol, or medication toxicity. A high AST:ALT ratio (>2) may point to alcoholic liver disease.
• High ALP and GGT — often indicate bile duct obstruction (e.g., gallstones, stricture) or cholestatic liver disease.
• High bilirubin — causes jaundice. It can be due to increased red blood cell breakdown (pre-hepatic), liver disease (hepatic), or bile duct blockage (post-hepatic).
• Low albumin — may reflect chronic liver disease, but also malnutrition or kidney problems.

It is important to know that mild, transient elevations are common and may resolve on their own. For example, a fatty liver often causes a mild ALT rise. Conversely, a normal LFT does not guarantee a healthy liver — cirrhosis can present with near-normal enzymes. Your doctor will consider your entire clinical picture before deciding on next steps.

Next Steps: When to See a Liver Specialist in Bangladesh

If your LFT results are abnormal, or if you have risk factors for liver disease (such as hepatitis B/C carrier status, diabetes, obesity, or a family history of liver problems), it is wise to consult a gastroenterologist or hepatologist. These specialists can order additional tests like an abdominal ultrasound, FibroScan (for liver stiffness), or viral hepatitis serology to pinpoint the cause. Do not ignore even mildly elevated values, especially if they persist.

To help you find a qualified doctor, use the table below to locate gastroenterologists in your division:

For more specialized liver care, you may also consider consulting a Hepatologist Specialists in Dhaka if you are in the capital or nearby.

Cost of LFT in Bangladesh

The price of a Liver Function Test in Bangladesh varies depending on the lab, location, and whether it is part of a package. Below are approximate ranges for common panels. Always confirm the current rate with the lab or hospital before testing.

Prices tend to be higher in Dhaka and in accredited hospitals compared to smaller city labs. Some labs offer home sample collection for an extra fee. Because costs change frequently, it is best to call two or three providers near you to compare.

Frequently Asked Questions

Do I need to fast before a Liver Function Test?

Yes, most doctors recommend fasting for 8 to 12 hours before an LFT. Water is usually allowed, but avoid tea, coffee, juice, or any food. Fasting helps give a more accurate baseline for certain markers like bilirubin and glucose. However, always confirm with your doctor or the lab, as some specific tests (like triglycerides) may require longer fasting. If you take daily medications, ask whether you should take them with water before the test.

Can medications or alcohol affect my LFT results?

Yes, many medications and alcohol can temporarily raise or lower LFT values. Common examples include paracetamol (acetaminophen), statins, some antibiotics, antiepileptic drugs, and herbal supplements. Alcohol consumed within 24–48 hours before the test can elevate liver enzymes. It is important to tell your doctor about all prescription and over-the-counter medicines, supplements, and any alcohol use. Do not stop any prescribed medication unless your doctor advises it.

How long does it take to receive LFT results in Bangladesh?

Turnaround time varies by laboratory. Most diagnostic centres in Dhaka and major cities deliver results within 24 to 48 hours. Some advanced labs may offer results the same day if the sample is submitted early. Rural or smaller labs may take 2–3 days. Ask your lab for an estimated time when you give the sample. In emergency hospital settings, results can be available within a few hours.

Can LFT results be normal even if I have a liver problem?

Yes. While LFT is a valuable screening tool, it is not 100% sensitive. Early-stage liver diseases, mild fibrosis, or compensated cirrhosis can sometimes show normal or near-normal LFT results. Conditions such as non-alcoholic fatty liver disease (NAFLD) may have only slight enzyme elevations that fall within the ‘normal’ range. That is why doctors often combine LFT with imaging (ultrasound, FibroScan) and clinical history for a complete assessment. If you have ongoing symptoms like fatigue, jaundice, or abdominal discomfort, discuss further testing with your doctor even if your LFT is normal.

What is the difference between LFT and an ultrasound of the liver?

LFT is a blood test that measures liver function (enzymes, proteins, bilirubin) and can indicate injury, inflammation, or bile duct problems. Liver ultrasound is an imaging test that uses sound waves to visualise the liver’s structure – it can detect fatty infiltration, cirrhosis, tumours, cysts, or gallstones. The two tests provide complementary information. Your doctor may order one or both depending on your symptoms and risk factors. LFT assesses function; ultrasound assesses structure.

Sources

The following sources are from international journals, government health agencies, or recognized medical organizations:

• Liver Function Tests – PubMed Health (PMID: 25074489) (pubmed.ncbi.nlm.nih.gov)
• Evaluation of Liver Function – StatPearls (NCBI Bookshelf) (ncbi.nlm.nih.gov)
• Liver Function Tests – Mayo Clinic (mayoclinic.org)
• World Health Organization — Liver Function Test (LFT) (who.int)
• MedlinePlus — Liver Function Test (LFT) (medlineplus.gov)
• CDC — Liver Function Test (LFT) (cdc.gov)