BILIRUBIN, DIRECT

Description

Bilirubin Direct Test for Dogs & Cats | Liver Health | At Home Petcare

The Direct Bilirubin test measures conjugated (direct) bilirubin in your pet’s blood — a key indicator of liver function and bile duct health. Elevated direct bilirubin in dogs and cats points to obstructive jaundice, hepatitis, or cholestasis. At Home Petcare offers doorstep blood collection in Hyderabad with results in 24–48 hours.

What Is Direct Bilirubin?

Bilirubin is a yellow pigment produced from the breakdown of red blood cells. It exists in two forms:

• Indirect (unconjugated) bilirubin: Pre-liver, bound to albumin
• Direct (conjugated) bilirubin: Processed by the liver and excreted in bile

Elevated direct bilirubin indicates the liver has conjugated the bilirubin but cannot excrete it properly — typically due to bile duct obstruction or liver cell damage.

Indications for Testing

Dogs

• Jaundice (yellow skin, eyes, or gums)
• Suspected liver disease or hepatitis
• Bile duct obstruction or cholestasis
• Gallbladder disease or mucocele
• Pre-surgical liver function evaluation
• Monitoring response to liver treatment

Cats

• Hepatic lipidosis (fatty liver disease)
• Cholangiohepatitis complex
• Anorexia with jaundice
• Triaditis (concurrent liver, pancreas, bowel disease)

Normal Reference Ranges

• Dogs: 0–0.1 mg/dL (direct bilirubin)
• Cats: 0–0.1 mg/dL

Any elevation above normal warrants further investigation. Values above 0.5 mg/dL in either species are clinically significant.

What High Direct Bilirubin Means

• Obstructive jaundice: Bile duct blockage by stones, inflammation, or tumors
• Hepatocellular disease: Hepatitis, cirrhosis, toxic liver injury
• Cholestasis: Impaired bile flow within the liver
• Pancreatitis: Pancreatic swelling compressing the bile duct
• Liver flukes (cats): Parasitic infection causing bile duct damage

Sample Requirements

• Sample type: Venous blood (serum)
• Fasting: 8–12 hours preferred (lipemia can interfere with results)
• Volume: 1–2 mL
• Handling: Protect from light; bilirubin degrades with prolonged light exposure

Turnaround Time

Results are available within 24–48 hours. Our veterinary professionals collect the blood sample at your home in Hyderabad and dispatch it to an accredited diagnostic laboratory.

Frequently Asked Questions

What is the difference between direct and total bilirubin?

Total bilirubin includes both direct (conjugated) and indirect (unconjugated) bilirubin. The direct fraction helps pinpoint whether the problem is hepatic (liver-related) or post-hepatic (bile duct obstruction) versus pre-hepatic (excessive red blood cell destruction).

Can this test diagnose jaundice in my pet?

Yes. Elevated direct bilirubin in combination with clinical jaundice helps identify the cause — whether liver disease, bile duct blockage, or hemolytic anemia — guiding your vet’s treatment plan.

Is the test available for both dogs and cats?

Yes. We test both species. Liver disease is especially common in cats (e.g., hepatic lipidosis) and the direct bilirubin test is a cornerstone of feline liver workup.

Do I need to fast my pet before the test?

Fasting for 8–12 hours is recommended to ensure a clear, non-lipemic sample and accurate results.

Will you come to my home in Hyderabad?

Yes. At Home Petcare serves all major areas of Hyderabad. Our trained staff will collect the blood sample at your convenience, minimizing stress for your pet.