Low protein in blood, called hypoproteinemia, occurs when total serum protein falls below 60-80 g/L. This condition often results from inadequate protein intake, liver dysfunction, or excessive protein loss through kidneys or gut.
Your liver produces most blood proteins, primarily albumin and globulins. Albumin regulates blood pressure and transports hormones, while globulins support immune function. The kidneys filter proteins, returning most to circulation. When this balance disrupts, protein levels drop.
The three primary causes are malnutrition, liver disease, and kidney disorders. Other factors include inflammation, chronic infections, and certain medications.
| Cause | Mechanism | Example Condition |
|---|---|---|
| Malnutrition | Insufficient dietary protein | Protein-energy malnutrition (PEM) |
| Liver disease | Reduced protein synthesis | Cirrhosis |
| Kidney disorders | Excessive protein loss | Nephrotic syndrome |
Symptoms include swelling (edema), fatigue, muscle wasting, and frequent infections. Diagnosis involves blood tests measuring total protein, albumin, and globulin levels. A healthcare provider may also check for underlying conditions like liver or kidney disease.
Many assume low protein only affects bodybuilders or athletes. However, it impacts anyone with chronic illnesses, malabsorption issues, or poor nutrition. For instance, celiac disease patients often develop hypoproteinemia due to intestinal damage impairing nutrient absorption.
I once reviewed lab results for a patient with unexplained swelling. Their albumin was critically low, revealing undiagnosed nephrotic syndrome. This underscores why identifying the root cause is important.
Consult a doctor if you experience persistent swelling, unexplained weight loss, or fatigue. Early diagnosis allows treatment of the underlying cause, whether through dietary changes, medication, or addressing organ dysfunction.