SGPT (ALT) Test: Normal Levels, Causes of High and Low Readings

The SGPT test (ALT blood test) is a common blood test used to assess liver health. The SGPT stands for Serum Glutamic-Pyruvic Transaminase, and the ALT stands for Alanine Aminotransferase. This enzyme can be found primarily within the liver cells and is important in protein metabolism. If liver cells become damaged or inflamed, ALT leaks into the bloodstream, resulting in increased levels.

An SGPT test may be recommended by your doctor if you have symptoms related to liver issues. Knowing what the normal SGPT range is, high levels and low levels can help patients to better understand their report. Molecular Diagnostics and Therapy provides diagnostic services to support doctors in assessing liver function.

What Is the SGPT (ALT) Test?

The SGPT test measures alanine aminotransferase (ALT) levels in the blood. ALT is an enzyme that helps to convert amino acids into energy and is primarily found in the liver. Small amounts can be found in other tissues. Normally, only small amounts are found in the bloodstream. However, if liver cells are damaged, ALT can enter the bloodstream in higher amounts. This means that high levels of SGPT can indicate liver cell damage. The SGPT test is typically part of liver function tests. The test is often done alongside other tests such as SGOT (AST), Alkaline Phosphatase (ALP), Bilirubin, Albumin, and other relevant markers. This helps doctors to better understand liver function.

Why Is the SGPT Test Recommended?

Your doctor may recommend that you have an SGPT test. This can help to identify if there is any inflammation or damage to the liver, investigate symptoms, and monitor liver conditions. Common symptoms that may cause you to have an SGPT test include continual tiredness, nausea, vomiting, loss of appetite, abdominal pain, dark urine, yellow skin or eyes, and unexplained tiredness.

An SGPT test may also be recommended if you have risk factors such as obesity, diabetes, drinking too much alcohol, viral hepatitis, a family history of liver issues, and long-term use of medication that may affect the liver. Patients may be tested regularly if they are undergoing treatment for liver issues. However, an SGPT test alone cannot determine the exact cause of liver damage.

SGPT Normal Range

Depending on the lab, the normal range can vary. Many labs list the normal range for adults as between 7-56 units per litre (U/L). Some labs have different ranges for males and females. You should always check the reference range listed on your lab report. If your result is within the normal range, this indicates that ALT levels are not high. However, this does not guarantee that there is no liver disease. Some patients with chronic liver conditions may have normal ALT levels. Your doctor considers other test results.

Causes of High SGPT Levels

High levels of SGPT indicate that liver cells may be irritated, inflamed, or damaged. The levels and symptoms can help your doctor to decide if further investigations are required.

• Fatty Liver Disease: Metabolic dysfunction-associated steatotic liver disease (MASLD) was previously commonly known as non-alcoholic fatty liver disease. This condition occurs when excessive fat builds up in the liver. This is associated with obesity, diabetes, insulin resistance, and high cholesterol. Some patients with fatty liver may have high levels of SGPT.
• Alcohol-Related Liver Damage: Regular or excessive alcohol can cause damage to liver cells. This can increase ALT levels. Continued damage can cause inflammation, scarring, and cirrhosis.
• Viral Hepatitis: Hepatitis A, B, and C and other viral infections can cause liver inflammation. During an active infection, SGPT levels may increase significantly. Further blood tests may be required to identify the infection.
• Medications and Supplements: Certain prescription medications, over-the-counter medications, and herbal remedies can affect liver function. Some can cause damage to the liver. This is especially the case if taken in high doses or alongside other substances. Never stop taking medication without speaking to a medical professional.
• Obesity and Metabolic Conditions: Obesity, insulin resistance, and type 2 diabetes can contribute to fatty liver and high liver enzymes. Managing these conditions can help improve liver function.
• Other Medical Conditions: Autoimmune hepatitis, certain genetic conditions, and other conditions can affect liver enzymes. In some cases, muscle damage or intense exercise can contribute to changes in ALT.

Having a high SGPT does not necessarily indicate that you have severe liver disease. Your doctor may recommend further testing. This can include further liver function tests, viral hepatitis tests, or imaging.

What Does Low SGPT Mean?

Low levels of SGPT are generally not a cause for concern. ALT is a natural enzyme in the body, and low levels generally do not indicate a specific liver issue. In some cases, low ALT can be associated with a vitamin B6 deficiency. This can occur in older patients or those with nutritional deficiencies. Low levels can also occur with age and certain chronic conditions. A low SGPT result generally does not require treatment. However, if you have other symptoms or abnormal test results, your doctor may recommend further investigations.

How Is the SGPT Test Performed?

The SGPT test is a simple blood test. A healthcare professional takes a blood sample from a vein (usually in the arm) using a sterile needle. The sample is then sent to the lab for testing. The test should only take a few minutes to complete. You usually do not need to fast for an SGPT test; however, if it is part of a larger panel of tests, your doctor may give you specific instructions. Let your doctor know if you are taking any medications, supplements, drinking alcohol, or have recently had intense exercise.

SGPT Test Cost: What Should You Know?

The cost of the SGPT test can vary depending on the diagnostic centre, city, lab, and whether it is a single test or part of a liver function panel. There may also be additional costs if the sample is collected from your home. Before booking your test, check what is included in the cost, if the sample can be collected, and how long it takes to receive your report. For the most up-to-date information on the cost of the SGPT test and to book, please contact the diagnostic centre. Molecular Diagnostics and Therapy provides diagnostic tests to help individuals and doctors understand various aspects of their health, including liver issues. Choose the correct test based on medical advice and your individual health needs.

How to Maintain Healthy SGPT Levels

Keeping your liver healthy requires a regular healthy lifestyle. Eating a healthy, balanced diet with plenty of vegetables, fruit, whole grains, and protein can help. Limiting sugary drinks and highly processed foods can help reduce metabolic risk factors. Regular exercise, maintaining a healthy weight, and managing blood sugar and cholesterol levels can help. Avoid drinking too much alcohol and do not take any unnecessary medications or supplements. If you have a known liver condition, follow your doctor’s advice on treatment. You may be advised to have regular SGPT tests.

Conclusion

The SGPT (ALT) test is an important blood test to assess if there is any damage to liver cells. High levels can be associated with fatty liver disease, viral hepatitis, alcohol damage, certain medications, and other medical conditions. Low levels generally are not clinically significant however can occasionally be associated with nutritional factors. Understanding your SGPT test is important. However, your doctor takes into account your symptoms, medical history, and other investigations to decide if further tests or treatment is required. Maintaining your health and making healthy lifestyle choices can help improve liver health in the long term.