Serum creatinine is a blood test used to assess kidney function by measuring the level of creatinine, a waste product from muscle metabolism, in the bloodstream. The kidneys filter creatinine out of the blood, so high levels can indicate impaired kidney function or kidney disease. Normal ranges for serum creatinine are typically 0.6 to 1.2 mg/dL for men and 0.5 to 1.1 mg/dL for women. Elevated levels suggest the kidneys may not be filtering waste properly, which can be caused by conditions like chronic kidney disease or acute kidney injury.

Liver function tests (LFTs) are a series of blood tests that assess how well your liver is working by measuring levels of proteins, enzymes, and waste products. These tests evaluate various liver functions, including producing proteins like albumin, clearing waste like bilirubin, and enzyme activity (e.g., ALT, AST). Abnormal LFT results can indicate liver damage or disease, such as hepatitis, cirrhosis, or fatty liver disease. Understanding these test results helps your doctor diagnose liver conditions and monitor ongoing liver health, making them essential in liver disease management.

The albumin blood test measures the amount of albumin, a protein made by the liver, in your blood. It plays a vital role in maintaining fluid balance and transporting essential substances like hormones and vitamins. Low albumin levels may indicate liver disease, kidney problems, or malnutrition, while normal levels typically range from 3.4 to 5.4 g/dL. The test helps assess liver function by checking how well the liver is producing proteins and kidney health by identifying whether proteins are being lost in the urine, a sign of kidney disease.

The Erythrocyte Sedimentation Rate (ESR) is a blood test that measures how quickly red blood cells settle at the bottom of a test tube. A faster-than-normal rate may indicate inflammation in the body, which can be associated with conditions like infections, autoimmune disorders, and certain cancers. A high ESR result suggests the presence of inflammation but doesn’t pinpoint the specific cause. Therefore, the ESR test is often used alongside other tests to diagnose and monitor inflammatory conditions, such as rheumatoid arthritis or lupus, and to track the effectiveness of treatments.