My dog has an elevated alkaline phosphatase. What does that mean?

dog with vet

There are several liver enzymes that veterinarians will check on a routine basis. The two most common liver enzymes checked are called ALT (alanine aminotransferase) and ALP (alkaline phosphatase). These enzymes come from different places in the liver, so the level of concern your veterinarian will have for your dog will vary depending on which enzyme is elevated and to what degree.

ALT should be tucked inside of the liver cell. When it comes out into the blood at higher than normal levels, this indicates that something is irritating the liver cell membrane, allowing the enzyme to leak out of the cell. Vets become concerned when this enzyme gets too high because it means that something is irritating or damaging the liver. There are a variety of reasons this enzyme can go up: infection, inflammation, toxin ingestion, a tumor and copper storage disease are all on veterinarians’ “rule-out” lists.  (Copper storage disease is a condition in which the body traps copper in the liver). A normal range for this enzyme is around 18–120 U/L (normal ranges vary by lab) and mild elevation in this enzyme is not uncommon, especially in older animals. Every veterinarian has a different comfort level for when to worry about this enzyme. For me, I start to get more concerned when the reading goes above 200.

ALP comes from a totally different spot in the liver, and changes in this liver enzyme typically cause less concern for veterinarians. (ALP also comes from the bone, so this enzyme is not liver specific. For the scope of this article, however, we will discuss ALP made by the liver). This enzyme is made on the liver cell membrane, and there are a variety of factors that can stimulate the liver to make more of this enzyme. The normal range for this enzyme is 5–160 U/L. For me, I start to get more concerned when this enzyme goes above 500. It is common to see this enzyme become very elevated in dogs that are otherwise acting normally. I have some patients that have an ALP in the 1,000–2,000 range and clinically appear healthy.

There are a variety of reasons that the liver will make more ALP enzyme. One common reason is that the aging liver will sometimes develop benign areas of liver growth called nodular hyperplasia. (You have probably heard that your ears and nose keep growing as you get older – so too will your liver grow new cells over time.) If there are more liver cells to make more of this enzyme, then the ALP will increase.

Another common reason for an older animal to have an elevated ALP is if they have Cushing’s disease.  Cushing’s disease (hyperadrenocorticism) is where the adrenal glands are producing more hormone then they should. These adrenal hormones influence the liver and turn on production of ALP.

Certain medications can also turn on production of ALP. One of the most notable medications that does this is a seizure medication called phenobarbital.  Phenobarbital can benignly cause an elevated ALP, but this medication can also cause liver damage. Because of this, it is common for veterinarians to want to do more testing on the liver if a dog has an elevated ALP and is taking phenobarbital so she can differentiate between a benign and toxic liver change.

It is not always a benign reason that the ALP is up. For example, the ALP will also go up in dogs if there is a gallbladder or bile problem, or a tumor in the liver.  Interpreting liver enzyme elevation is where the “Art of Medicine” comes in and the practitioner must take in the big picture of the pet and the desires of the client. If the pet is clinically normal, then monitoring may be recommended. If the pet is acting sick (drinking more, not eating, vomiting, panting or otherwise seeming unwell), or the client wants more information, then the practitioner may recommend further testing, like a liver ultrasound.

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  • Diana Barsotti

    What would the treatment be if Akko is out of range by 1948 u/l and it’s not crushing disease m?

  • Kim

    My dogs ALP is 1152. She is acting fine so the vet said let’s just watch her. Her urinalysis came back with 3+ in her urine though which is a worry to me. I have changed some things with her food and added some things to nourish the liver so hopefully next test is normal or close to being normal. It scares me though.

  • eastcoastelliott

    My dachshunds count is 566 so I was Concerned but your dog is much higher,

  • eastcoastelliott

    What did you purchase to aid the liver

  • Kim

    Yes I don’t think I’d be that concerned unless yours starts showing signs that come with elevated liver.

  • Kim

    I was given Denamarian advanced once a day from vet. Recently a dog food guru told me to add milk thistle as well so she gets both. Numbers previous to milk thistle were still off. I’m trying to figure out what to feed her but I’m hitting a brick wall on that.

  • Kim

    Milk thistle is in capsule form

  • Kim

    I’m not sure what Akko is?

  • Linda Davreux PREC

    Took my 5 yr old papillon/chihuahua to the vet beginning of January because he collapsed suddenly at the rear, appeared to be hip related, was very odd. I asked for a blood test, vet said luxating patella is the issue and I could consider surgery. Took him to another vet and asked for a blood test, They told me the same thing, took xrays and gave us anti inflamatories, did nothing, the rest of his body started to give out, they prescribed pain medication. I pleaded for a blood test. They said not needed. Then I insisted, they did the test in February and said his immune system attacking himself and put him on prednisone. He started to do alright but then not very well. After a couple months I asked for another blood test. They said not needed. This week I insisted. Now, my pup has an elevated ALP of 1347, ALT of 450 and platelet count of 592, comments on the test say variability in platelet size, numbers are increased platelets clumped.. I’m very worried. Now they’re telling me to reduce the prednisone substantially (they previously told me it must be done very gradually. the last time we tried to reduce we ended up having to double up on it again) Any advise would be greatly appreciated.

  • Jennifer Brooke Bogar

    I’ve got a dachshund whose ALPs have been climbing and he’s been on Denamrin and Urisoidol. Now they are recommending an ultrasound, which I am getting ready to do. Milk thistle alone appeared to help and then took him back and the ALPs had risen again. I’m praying daily. Any suggestions please. I am considering a second opinion as well.

  • Elizabeth Courtney

    The same happened to my old dog same symtons her her liver elevated to over 2000 vet kept saying it was arthritis and her meds She had a liver tumour not much prognosis info keep her on previcox as it’s a good pain killer even though its cancer generated from liver disease.Dog was very lathergic told she could be put down on the table if they attempted surgery steroids could make it worse or a short time managing her disease.She started getting more lethargic she had near white lips and gums was told to take her home and bring her back if symptoms worsened dog got more lethargic next morning and started droplets oc blood in her urine.Didnt know what to do so had her pug down she had severe arthritis and they weren’t giving that much attention either so best decision but lost my dog from neglected cancer that was there at least 4 mths because vet never cared to do further tests.

  • Linda Davreux PREC

    Thank you for commenting Elizabeth. I’m just beside myself. Why the vets don’t listen to the owners is beyond me. Since day 1 I asked for blood tests, you know when things just aren’t right with your pet. Right now we’re still coming off the steroids. I called Vet #1 (because he’s local) and he told me that the steroids wouldn’t have caused the liver problems and that something else is going on. I am unsure of how to proceed with vet #2. I want her to figure out what’s going on with his liver. This has been going on since January (6 1/2 mo.) so I’m really hoping it isn’t too late to treat whatever is going on with my little one. If anyone has any suggestions please let me know.

  • Jim

    Hi, my dog has slowly lost some weight and muscle mass in his hind
    quarters. He’s an Aussie Terrier mix, normal weight for him has been
    approx. 21 pounds. He’s now 13 1/2 yrs old. A year ago saw enlarged
    lymph nodes and was put on prednisone and his AST levels were 150-160. 6
    mo. checkup, still on prednisone and AST 250. 6 mo. later,(today), he’s
    still on prednisone and AST is 900+.

    No jaundice, nausea,
    bleeding. Eats mostly ok. But still 900+ and we’re alarmed. What to do??
    Diet? Do’s & don’t s , is he near death??Any thoughts would be grateful

  • Debra Hooks

    My 12 year old Cairn Terrier was acting a little lethargic but eating, drinking, urinating and having bowel movements ok. Took him to the vet, ask for a senior blood panel. His Alk Phosphatase is 1,132 and Plts 631. Also Precision PSL is 168, indicating possible mild pancreatitis. Started him on Denamarin 225mg daily. About 3 years ago he had his spleen removed for a benign baseball size tumor. I feed him a 7 species fish based freeze-dried raw coated dog food and give him 3 drops of CBD dog oil 200mg 2 times per day. What are your thoughts? Thank you, Collin’s mom

  • MyPersonal-photogpage Eam

    There is food from Hills and Royal Canin for Liver disease. White rice, small amounts of protein like chicken should be fine. Just google

  • MyPersonal-photogpage Eam

    Get an ultra sound and xray done on the liver. Secondly, watch the diet, smaller meals throughout day. Limit protein. Could also be Cushings Disease. For testing, A dog will need to be at vets all day, and have blood checked throughout the day. If its cushing, medication can be given.

  • Tanisha Yadav

    I have a pug which is 5years old. His Urea Level is high of 219.2, BUN 102, Creatinine 5.5, alkaline phosphatase 397. What do youll recommend and what do you’ll think how can he recover?

    P.S. we are showing hin to the doctor from past 10days , he was on antibiotics before and Had symptoms like vomiting and diarrhea. The doctor said he had kidney failure and there are no treatment. I am scared that’s why I’m evening messaging at every site to know any way of getting him back to good health..

  • Rick Boynton

    I’m curious as too the weight of your Chi, and the highest dose your vet recommended for prednisone? My Maltipoo has elevated ALKP of 1300, and ALT of 358, and our vet says its the prednisone. We are cutting her back to 1/2 the original dose. Constantly starving as well. She was on 1.25mg twice a day.

  • Rick Boynton

    Curious as to what posters think here. Could prednisone exclusively be the cause for my 6 Pd Maltipoo to have ALKP of 1300, and ALT of 358? That’s what I am told and we are taking her down from 1.25mg twice a day to 1/2 that dose.

    She is also literally starving 24/7, scavenging, and sometimes tries to eat her own poop. A few months ago she had her entire ileum removed, including the valve, because of a very severe infection. All started with diarrhea back in April. Her stools are much better now, but my latest concern is her extremely high levels of ALKP and ALT.

    Her RETICS are also 217. However, her ALKP went from 159 to 419 to 1300 in a matter of weeks. ALT went from 85 to 149 to 358 in the same time period. We are centrating on getting her weight up as she went from 7+ pds to around 5 pds suddenly, a few months ago. Now she is constantly starving and I have increased her weight by 1 pd in the last month. Just crossed 6 pds.

    Any insight would be appreciated.


  • seems2me

    Have you researched Sam-E with Milk Thistle. This helps to heal the liver and helps to bring down the ALKP

  • Rick Boynton

    Thanks seemstome, Chloe is 6 pds now. Any idea on dose of Milk Thistle and Sam-E? Yes, I have provided spring water to Chloe her entire life.

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