AMMONIA, BLOOD

Description

Blood Ammonia Test measures the level of ammonia (NH₃) in your pet’s blood. Ammonia is a toxic by-product of protein metabolism that is normally processed and detoxified by the liver and converted to urea for excretion. When the liver fails to perform this function adequately, ammonia accumulates in the bloodstream and can cause a life-threatening neurological condition called Hepatic Encephalopathy (HE). At Home Petcare offers doorstep blood ammonia testing for dogs and cats in Hyderabad.

Why Is Blood Ammonia Tested?

The blood ammonia test is primarily a liver function test — it evaluates the liver’s ability to detoxify metabolic waste products. Unlike routine liver enzymes (ALT, ALP) which detect liver cell damage, ammonia specifically reflects how well the liver is functioning, making it one of the most direct functional tests available.

• Hepatic Encephalopathy (HE): The most important indication for ammonia testing. HE is a brain disorder caused by ammonia accumulation when the liver cannot detoxify it. Affected pets show neurological signs — confusion, circling, head pressing, seizures, and altered consciousness.
• Portosystemic Shunts (PSS): Congenital or acquired abnormal blood vessel connections that bypass the liver, leading to elevated blood ammonia. Common in Yorkshire Terriers, Maltese, Poodles, and Pugs.
• Severe liver disease: Chronic hepatitis, cirrhosis, hepatic lipidosis (especially in cats), and end-stage liver failure all impair ammonia detoxification.
• Urea cycle enzyme deficiencies: Rare metabolic disorders affecting ammonia conversion.

Clinical Signs That Prompt This Test

• Sudden disorientation, confusion, or aimless wandering
• Head pressing against walls or fixed objects
• Seizures or loss of consciousness — especially post-meal (protein load)
• Excessive drooling and salivation
• Sudden blindness (amaurosis)
• Marked lethargy or stupor
• Abnormal behaviour or personality changes in a previously normal pet
• Small breed puppy or kitten with poor growth, excessive thirst/urination, and neurological signs (suspect congenital portosystemic shunt)
• Any dog or cat with known or suspected liver disease showing neurological deterioration

Blood Ammonia in Dogs vs. Cats

• Dogs: Normal blood ammonia: approximately 45–120 μg/dL. Dogs are particularly susceptible to ammonia-induced HE with portosystemic shunts — this is one of the most common causes of HE in young dogs.
• Cats: Normal blood ammonia: approximately 30–100 μg/dL. Hepatic lipidosis (fatty liver disease) is the leading cause of HE and elevated ammonia in cats, often triggered by anorexia lasting more than 2–3 days.

Sample Collection — Critical Considerations

• Sample type: Whole blood collected in a special EDTA/heparin tube — must be processed and tested rapidly (within 30 minutes) to prevent false elevation from in-vitro ammonia production by red blood cells
• Fasting: A 12-hour fast before sample collection is strongly recommended for accurate baseline results
• Handling: Sample must be kept on ice and delivered to the laboratory immediately — delays cause unreliable results
• Collection: Performed at your home by At Home Petcare’s trained veterinary professional with appropriate cold-chain transport coordination

Understanding Your Results

• Elevated ammonia: Strongly suggests hepatic dysfunction, portosystemic shunting, or severe GI bleeding (blood breakdown produces ammonia). Immediate veterinary attention is required.
• Normal ammonia with neurological signs: Does not entirely rule out HE — ammonia can fluctuate. Bile acids test (pre- and post-prandial) is recommended as a complementary liver function test.
• Management: Treatment includes low-protein diet, lactulose (reduces colonic ammonia production), antibiotics (neomycin, metronidazole), and treatment of the underlying liver disease or surgical correction of portosystemic shunts.

Frequently Asked Questions

Is ammonia testing done at home in Hyderabad?

Yes. At Home Petcare provides doorstep blood collection in Hyderabad. Because ammonia samples require rapid processing, our veterinary professional coordinates cold-chain transport immediately after collection to ensure accurate results.

Can I test blood ammonia along with other liver tests?

Yes — and this is strongly recommended. Blood ammonia is most informative when combined with a full Liver Function Test (LFT) panel (ALT, ALP, GGT, Bilirubin, Albumin, Blood Glucose) and bile acids. Together these give a complete picture of liver health and function.

My cat stopped eating for 3 days — should I test ammonia?

Yes. Cats that refuse food for 48–72 hours are at high risk of developing hepatic lipidosis — the most common liver disease in cats — which can rapidly lead to elevated ammonia and hepatic encephalopathy. Early testing and intervention are critical.