A/G Ratio
- Sample Type
- Serum
- Fasting
- Required
- Unit
- ratio
Function and Overview
The A/G ratio is a calculated value representing the relationship between two major types of proteins found in the blood: albumin and globulin. Albumin is produced by the liver and accounts for about 60% of total protein; it maintains oncotic pressure and transports various substances. Globulins are a diverse group of proteins, including enzymes, transport proteins, and antibodies (immunoglobulins). The ratio is determined by dividing the albumin level by the globulin level (Total Protein minus Albumin).
Why it is Ordered
This ratio is a standard part of a Liver Function Test (LFT) or a Comprehensive Metabolic Panel (CMP). It is used to:
- Screen for liver and kidney disease.
- Evaluate nutritional status.
- Investigate unexplained weight loss or edema (swelling).
- Monitor chronic inflammatory conditions or certain blood cancers like Multiple Myeloma.
Associated Conditions
A disturbed A/G ratio is often a red flag for underlying systemic issues. A low ratio (low albumin or high globulin) is frequently associated with cirrhosis of the liver, nephrotic syndrome (kidney loss of protein), or autoimmune diseases. A high ratio (high albumin or low globulin) is less common but can be seen in cases of severe dehydration or genetic immunodeficiencies where antibody production is impaired.
Why Context Matters
The A/G ratio can be skewed by simple factors like acute dehydration, which artificially elevates albumin levels. High-protein diets or the use of certain medications (like anabolic steroids or corticosteroids) can also alter protein synthesis. Because it is a ratio, it does not specify which protein is abnormal; therefore, a second opinion involving Protein Electrophoresis is often required to pinpoint the exact cause of the imbalance.
Lab ranges are statistical averages, not biological laws. "Normal" for a 20-year-old male isn't normal for a 60-year-old female.
Clinical References
Source-of-truth databases and clinical guidelines for A/G Ratio:
Official Sources
Research & Guidelines
- PubMed: A/G Ratio Clinical GuidelinesNCBI / PubMed
Related Indicators
Medically Reviewed by Dr. Binoy Babu, MBBS
Board Certified Doctor • 10+ Years Clinical Experience
Dr. Babu is a practicing physician dedicated to empowering patients with clear, actionable medical information. He founded 2opi to bridge the gap between complex lab reports and patient understanding, ensuring everyone has access to a reliable second opinion.
Get Notified When Dr. Babu Is Available