5′-Nucleotidase Test: High Levels, Normal Range, Cholestasis, Bile Duct Disease, and Results
The 5'-nucleotidase test is a blood test that helps show whether an elevated alkaline phosphatase result is more likely coming from the liver and...
Alanine Aminotransferase (ALT) Normal Range: Reference Values and Meaning
Alanine aminotransferase, usually shortened to ALT, is a liver enzyme measured on many routine blood panels. ALT helps liver cells process amino acids, but...
Albumin and INR: Interpreting Liver Synthetic Function
Albumin and INR help show how well the liver is making important blood proteins. Albumin is a protein made by the liver that helps...
Albumin Blood Test Normal Range: Reference Values and Meaning
An albumin blood test measures the amount of albumin, the main protein in the liquid part of your blood. Albumin is made by the...
Albumin/Globulin (A/G) Ratio Normal Range: Reference Values and Meaning
The albumin/globulin ratio, often written as the A/G ratio, compares two major groups of proteins in the blood: albumin and globulins. A typical adult...
Alkaline Phosphatase (ALP) Normal Range: Reference Values and Meaning
Alkaline phosphatase, often shortened to ALP, is an enzyme measured in blood to help assess liver, bile duct, and bone activity. Many people first...
ALP and GGT: Interpreting Liver vs Bone Alkaline Phosphatase Patterns
Alkaline phosphatase (ALP) is one of the most useful blood markers for spotting a liver, bile duct, or bone pattern, but it is also...
Alpha-1 Antitrypsin (A1AT) Blood Test: Low A1AT, Deficiency, Liver Disease, Lung Risk, and Results
Alpha-1 antitrypsin, often shortened to A1AT or AAT, is a protective protein made mainly by the liver and released into the bloodstream. Its best-known...
ALT and AST: Interpreting Liver Enzymes Without Overdoing It
ALT and AST are liver enzymes that often rise when liver cells are irritated, inflamed, or injured. They are useful warning lights, but they...
ALT vs AST: What Is the Difference in Liver Blood Tests?
ALT and AST are two liver enzymes often reported together on a liver panel, but they do not tell the same story. ALT is...
Amylase Blood Test Normal Range: Reference Values and Meaning
An amylase blood test measures the amount of amylase enzyme circulating in your blood. Amylase helps digest starches and other carbohydrates, and most of...
APRI Score Test: AST-to-Platelet Ratio Index, Liver Fibrosis Score, Calculator, and Results
The APRI score is a simple liver fibrosis score calculated from two common blood test results: AST and platelet count. It was developed to...
Aspartate Aminotransferase (AST) Normal Range: Reference Values and Meaning
Aspartate aminotransferase, usually called AST, is an enzyme measured in blood tests to look for signs of liver cell irritation or injury. It is...
AST/ALT Ratio and GGT: Interpreting Alcohol-Related Liver Patterns
AST, ALT, and GGT are common liver-related blood tests, but their pattern often says more than any single number. A higher AST than ALT,...
AST/ALT Ratio Test: High Ratio, Liver Disease Patterns, Alcohol-Related Liver Injury, and Meaning
The AST/ALT ratio compares two liver enzymes, aspartate aminotransferase (AST) and alanine aminotransferase (ALT), to see which one is higher and by how much....
Bilirubin and Liver Enzymes: Interpreting Jaundice Blood Tests
Jaundice is the yellow color that can appear in the eyes or skin when bilirubin builds up in the blood. A bilirubin result by...
Carbohydrate-Deficient Transferrin (CDT) Test: Alcohol Use Marker, Liver Risk, Normal Range, and Results
Carbohydrate-deficient transferrin, usually called CDT, is a blood test that can help identify sustained heavy alcohol use over the past several weeks. It is...
Cholinesterase Blood Test: Low Cholinesterase, Liver Function, Pesticide Exposure, and Results
A cholinesterase blood test measures enzyme activity related to nerve signaling, liver protein production, or sensitivity to certain anesthesia medicines. The name can be...
Cytokeratin-18 (CK-18) Blood Test: Fatty Liver, NASH, Liver Cell Death, and Results
Cytokeratin-18, often shortened to CK-18 or K18, is a protein found inside many epithelial cells, including liver cells. When liver cells are injured or...
Direct Bilirubin Blood Test: High Direct Bilirubin, Normal Range, Liver and Bile Duct Causes
A direct bilirubin blood test measures the water-soluble bilirubin fraction that has already been processed by the liver. It is usually ordered as part...