Scleral Icterus: Causes, Symptoms & Treatment
Scleral icterus is the yellowing of the white part of the eyes caused by elevated bilirubin levels in the blood. It is a common early sign of jaundice.
Things worth knowing about "Scleral Icterus"
Scleral icterus is the yellowing of the white part of the eyes caused by elevated bilirubin levels in the blood. It is a common early sign of jaundice.
What Is Scleral Icterus?
Scleral icterus refers to the yellow discoloration of the sclera – the white part of the eye – caused by elevated levels of bilirubin in the bloodstream. Bilirubin is a yellow-orange pigment produced during the breakdown of hemoglobin, the red pigment in blood cells. Because the sclera is rich in collagen fibers that readily bind bilirubin, yellowing of the eyes often appears earlier than yellowing of the skin. Scleral icterus is therefore considered one of the earliest and most reliable clinical signs of jaundice.
Causes
Scleral icterus occurs when serum bilirubin levels rise above 2–3 mg/dL. The underlying causes can be grouped into three main categories:
Pre-Hepatic Causes (before the liver)
- Hemolytic anemia: Accelerated destruction of red blood cells produces excess bilirubin.
- Malaria and other infections associated with increased blood cell breakdown
Hepatic Causes (within the liver)
- Hepatitis: Viral or alcoholic liver inflammation impairs bilirubin processing.
- Liver cirrhosis: Chronic liver disease with reduced liver function
- Wilson disease and other metabolic liver disorders
- Gilbert syndrome: A benign, hereditary condition affecting bilirubin metabolism
Post-Hepatic Causes (after the liver)
- Gallstones: Obstruction of the bile ducts prevents bilirubin from being excreted.
- Pancreatic cancer or other tumors compressing the bile ducts
- Primary sclerosing cholangitis (PSC)
Symptoms and Associated Signs
Scleral icterus is itself a visible sign rather than a standalone symptom. Depending on the underlying condition, the following may also be present:
- Yellowing of the skin (jaundice)
- Dark, tea-colored urine due to bilirubin excretion through the kidneys
- Pale or clay-colored stools due to reduced bile reaching the intestines
- Itching (pruritus) caused by bile salt deposits in the skin
- Fatigue, loss of appetite, and nausea
- Abdominal pain, particularly with gallstones or liver disease
Diagnosis
Scleral icterus is first identified through physical examination, with a physician inspecting the eyes under good lighting. To determine the underlying cause, the following investigations are used:
- Blood tests: Total, direct, and indirect bilirubin levels; liver function tests (ALT, AST, GGT, ALP); complete blood count
- Urine and stool analysis: Detection of urobilinogen and bilirubin
- Abdominal ultrasound: Evaluation of the liver, gallbladder, and bile ducts
- Advanced imaging: CT scan, MRI, or ERCP when bile duct obstruction is suspected
- Liver biopsy: Performed in cases of unexplained liver disease
Treatment
Treatment of scleral icterus is directed entirely at the underlying cause:
- Hepatitis: Antiviral therapy (e.g., for hepatitis B or C), alcohol abstinence
- Gallstones: Endoscopic removal (ERCP) or surgical intervention
- Hemolytic anemia: Treatment of the primary condition; blood transfusion if needed
- Liver cirrhosis: Treating the cause, nutritional support, and liver transplantation in severe cases
- Tumors: Oncological therapy, bile duct stenting to relieve obstruction
Resolution of scleral icterus is a positive indicator that bilirubin metabolism is improving.
When to See a Doctor
Yellowing of the eyes should always be evaluated by a healthcare professional promptly, as it may indicate a serious condition affecting the liver, bile ducts, or blood. Medical attention is especially urgent when accompanied by pain, fever, unintended weight loss, or very dark urine.
References
- Longo DL et al. (Eds.) – Harrison's Principles of Internal Medicine, 21st Edition, McGraw-Hill (2022)
- European Association for the Study of the Liver (EASL) – Clinical Practice Guidelines on the management of jaundice. Journal of Hepatology (2023). Available at: https://www.easl.eu
- Roche SP, Kobos R – Jaundice in the adult patient. American Family Physician, 69(2):299–304 (2004)
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