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Alanine Aminotransferase (ALT)

ALT is an enzyme found in the liver that helps convert proteins into energy for the liver cells. When the liver is damaged, ALT is released into the bloodstream and levels increase.

ALT test

Also Known as : ALT, Serum Glutamic-Pyruvic Transaminase, SGPT, GPT, Alanine Transaminase, ALAT


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Test Panel: Total Bilirubin, Conjagated Bilirubin, Unconjugated Bilirubin, ALT, AST, ALP, Total Protein, Albumin, Globulin, A/G ratio, GGT,

Why Get Tested :

A liver function test is often recommended in the following situations:

  • ALT diagnose any kind of liver disease.
  • to check for damage from liver infections, such as hepatitis B and hepatitis C
  • ALT has done for follow up of the patient on treatment.
  • ALT is done in routine in patients on chemotherapy.
  • ALT may be advised in a patient with treatment on antituberculous treatment.

When to Get Tested :

When ALT Test Orderd :

A liver panel, or one or more of its components, may be ordered when someone is at risk for liver dysfunction. Some examples include:

  • People who take medications that may potentially damage the liver
  • Those who are alcoholics or heavy drinkers
  • Those who have a history of known or possible exposure to hepatitis viruses
  • Individuals whose families have a history of liver disease
  • People who are overweight, especially if they have diabetes and/or high blood pressure

A liver panel may be ordered when a person has signs and symptoms of liver disease; however, most people who have liver disease do not have any of these symptoms until the disease has been present for many years or is very severe. Some of these include:

  • Weakness, fatigue
  • Loss of appetite
  • Nausea, vomiting
  • Abdominal swelling and/or pain
  • Jaundice (yellowing of eyes or skin)
  • Dark urine, light-colored stool
  • Itching (pruritus)
  • Diarrhea

Usually no one single set of liver tests is used to make a diagnosis. Often, several liver panels will be ordered over a few days or weeks to help determine the cause of the liver disorder and evaluate its severity

Sample Required:

  • This is done on serum of the patient.
  • The Blood sample can be taken at any time.
  • The fasting sample is not necessary.
  • Analyze the enzyme on the same day because the enzyme activity is lost at room temperature.
  • The sample can be stored at 4 °C for 1 to 3 days.

Precautions For Sample:

  1. Avoid hemolysis, because RBC contains increased ALT and AST.
  2. Drugs that may increase the SGPT value are like acetaminophen, aminosalicylic acid, ampicillin, allopurinol, cephalosporin, chlorpropamide, clofibrate, cloxacillin, codeine, indomethacin, INH, Methyldopa, methotrexate, nalidixic acid, quinidine, phenylbutazone, phenytoin, salicylates, tetracycline, and propanol. 
  3. Ideally perform the test as soon as possible or on the same day. Because the storage of the sample is not satisfactory.

Normal Value :

AgeMale U/LFemale U/L
Newborn to 1 Year13 to 4513 to 45
Morethen 1 Year10 to 407 to 35

The increased ALT level is seen in:

  1. Viral hepatitis. There is markedly increased the level.
  2. Drug-induced hepatitis.
  3. Chronic hepatitis.
  4. Infectious mononucleosis.
  5. Intrahepatic cholestasis.
  6. Cholecystitis.
  7. Active cirrhosis.
  8. Metastatic tumors of the liver.
  9. Obstructive jaundice.
  10. Alcoholic cirrhosis.
  11. The mild increase is seen in :
    1. Myosotis.
    2. Pancreatitis.
    3. Myocardial infarction.
    4. Shock.
    5. Infectious mononucleosis.

Related Tests:

Theses tests to be tested in Liver Function Tests (LFT’s) :

  1. Total Bilirubin
  2. Conjugated Bilirumin
  3. Unconjugated Bilirubin
  4. ALT (SGPT)
  5. AST (SGOT)
  6. Alkaline Phasphatase
  7. Total Protein (TP)
  8. Albumin
  9. Globuline
  10. A/G Ratio
  11. Gamma GT (GGT)

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