Blood work and increased lipase

[Waterheater]

Week 4 on retatrutide and I got a huge lipase spike.

Just got my bloodwork back and noticed a significant jump in lipase: 39 U/L in March → 249 U/L now (ref 13–60), so just over 4× upper limit of normal. Pancreatic amylase also up: 27 → 80 U/L (ref 10–65).

No abdominal pain or other symptoms, feeling great, down from 90 kg (198 lbs) to 83.8 kg (185 lbs) in 4 weeks which is more than expected at only 1mg.

I know asymptomatic lipase elevation is a known class effect with GLP-1 based therapies, and the phase 2 NEJM data does mention it. But the jump from 39 to 249 in a single month feels significant, and I’m curious whether others have seen similar numbers.
Has anyone experienced this on reta? Did your levels stabilize, or did you adjust your dose?

 

[Turbo-Farmer]

What happened to your triglycerides in the same timeframe? Part of the effect of Reta is to breakdown fat.

 

[Waterheater]

I am not sure if the triglycerides have been tested. Isn’t the effect on triglycerides only positives? Like my liver values dropped from 50 something to 20.

Lipase is somewhat transferable to pancreatitis, that’s my concern.

 

[woundcarping]

I tested my lipase and amylase this past week, no symptoms or concerns, just getting a baseline towards pancreatitis.

I didn’t learn about asymptomatic elevations, and usually symptoms are the leading indicator confirmed cause by labs.

GPT says

Asymptomatic + <3× ULN → monitor, no immediate action

• Recheck in 4–12 weeks
• Continue GLP-1 unless:
  • Levels keep climbing
  • Symptoms develop

It suggests it’s not a concern until you’re 3x the lab upper range.

 

[Turbo-Farmer]

I am not sure if the triglycerides have been tested. Isn’t the effect on triglycerides only positives? Like my liver values dropped from 50 something to 20.

Lipase is somewhat transferable to pancreatitis, that’s my concern.

the effect on triglycerides is positive. Lipase is what breaks down fat. The increase may be due to your body adjusting to a different metabolic state and breaking down fat in your body.

The following curiosity of Ai

As an investigational triple-hormone agonist (acting on GLP-1, GIP, and glucagon receptors), Retatrutide interacts with lipase in two primary ways: through its effect on lipoprotein lipase (LPL) involved in fat metabolism, and its potential impact on pancreatic lipase levels.
1. Lipid Metabolism and Lipoprotein Lipase (LPL)
Research indicates that Retatrutide significantly improves the lipid profile by targeting the proteins that regulate fat breakdown.
• Reduction of ANGPTL3/8: Recent clinical data (2024–2026) suggests that Retatrutide dose-dependently decreases levels of ANGPTL3/8, which is the most potent inhibitor of lipoprotein lipase (LPL).
• Enhanced Fat Breakdown: By lowering these inhibitors, Retatrutide allows LPL to work more effectively. This leads to a substantial reduction in triglycerides—sometimes up to 40% at higher doses—by speeding up the clearance of triglyceride-rich lipoproteins from the blood.
2. Pancreatic Lipase and Safety
Like other medications in the GLP-1 and GIP class (such as Semaglutide or Tirzepatide), Retatrutide’s effect on the pancreas is a point of clinical monitoring.
• Asymptomatic Elevations: In clinical trials for this class of drugs, it is common to see mild, asymptomatic increases in serum amylase and lipase levels. These elevations often occur without any clinical signs of pancreatitis.
• Pancreatitis Risk: While serious cases of acute pancreatitis are rare, any significant rise in lipase accompanied by severe abdominal pain, nausea, or vomiting is typically treated as a medical priority.

 

[Jfrick11]

Week 4 on retatrutide and I got a huge lipase spike.

Just got my bloodwork back and noticed a significant jump in lipase: 39 U/L in March → 249 U/L now (ref 13–60), so just over 4× upper limit of normal. Pancreatic amylase also up: 27 → 80 U/L (ref 10–65).

No abdominal pain or other symptoms, feeling great, down from 90 kg (198 lbs) to 83.8 kg (185 lbs) in 4 weeks which is more than expected at only 1mg.

I know asymptomatic lipase elevation is a known class effect with GLP-1 based therapies, and the phase 2 NEJM data does mention it. But the jump from 39 to 249 in a single month feels significant, and I’m curious whether others have seen similar numbers.
Has anyone experienced this on reta? Did your levels stabilize, or did you adjust your dose?

No one's focusing much on this.... That’s really fast to lose that much. Rapid weight loss like that can absolutely stress the gallbladder and pancreas. Slowing down would be smart along with a lab recheck in the very near future.

 

[woundcarping]

No one's focusing much on this.... That’s really fast to lose that much. Rapid weight loss like that can absolutely stress the gallbladder and pancreas. Slowing down would be smart along with a lab recheck in the very near future.

13 pounds in the first month isn’t crazy shedding water from glycogen and other changes. That is a strong percentage of body weight.

I’m 17 weeks in averaging 1%/week. My goal is 1-1.2%/week to be aggressive but moderate stress. My learning before getting started suggested above 1.5% sustained is a great way to have a bad time.

Occasionally I’ll overshoot in a week, no big deal, make some adjustments and carry on. Monday to Saturday I dropped 4lb (2.3% adjusted weekly), dropped my dosing Friday and focused on eating whatever interested me.

 

[Jfrick11]

13 pounds in the first month isn’t crazy shedding water from glycogen and other changes. That is a strong percentage of body weight.

I’m 17 weeks in averaging 1%/week. My goal is 1-1.2%/week to be aggressive but moderate stress. My learning before getting started suggested above 1.5% sustained is a great way to have a bad time.

Occasionally I’ll overshoot in a week, no big deal, make some adjustments and carry on. Monday to Saturday I dropped 4lb (2.3% adjusted weekly), dropped my dosing Friday and focused on eating whatever interested me.

I get the glycogen/water argument, but 13 lbs in 4 weeks plus a 4× lipase increase isn’t something I’d brush off as “normal early loss.” That’s your body waving a flag

 

[woundcarping]

I get the glycogen/water argument, but 13 lbs in 4 weeks plus a 4× lipase increase isn’t something I’d brush off as “normal early loss.” That’s your body waving a flag

Reading multiple sources this morning, the consensus from everything I’ve read states that asymptomatic lipase elevations less than 3x the upper limit are literally a non issue.

Routine labs are specifically not recommended by some sources to reduce anxiety over a non issue.

When should you consider changes? Consensus agrees when symptoms present.

I lost 11lb in my first month of Tirz, 13lb on my first month of Reta. No symptoms of pancreatic issues, amylase was 60U/l lipase was 53U/l as of last week. That was my first labs for it, I bet it was higher when I was earlier in my journey but I have no way of telling now. I don’t usually get data anxiety, but I read labs weren’t a leading indicator of pancreatitis and are used to Dx suspected symptoms. The tests were a few bucks and I wanted the data.



Do you have specific information that contradicts this? I haven’t found any yet, aside from your posts.


Gemini got it in a single screen shot:

 

[Jfrick11]

Reading multiple sources this morning, the consensus from everything I’ve read states that asymptomatic lipase elevations less than 3x the upper limit are literally a non issue.

Routine labs are specifically not recommended by some sources to reduce anxiety over a non issue.

When should you consider changes? Consensus agrees when symptoms present.

I lost 11lb in my first month of Tirz, 13lb on my first month of Reta. No symptoms of pancreatic issues, amylase was 60U/l lipase was 53U/l as of last week. That was my first labs for it, I bet it was higher when I was earlier in my journey but I have no way of telling now. I don’t usually get data anxiety, but I read labs weren’t a leading indicator of pancreatitis and are used to Dx suspected symptoms. The tests were a few bucks and I wanted the data.



Do you have specific information that contradicts this? I haven’t found any yet, aside from your posts.


Gemini got it in a single screen shot:

The <3× ULN point comes from pancreatitis diagnostic criteria, most guidelines (ACG, AGA) use ≥3× ULN with symptoms as part of diagnosis. But that same threshold is also why elevations above that level aren’t typically dismissed outright, even if asymptomatic.
GLP-1s are known to raise lipase, but the clinical trials generally show modest increases, not jumps >4× ULN in a month. That’s outside the “routine mild elevation” bucket.

I’m not saying this is pancreatitis, but >3× ULN is usually where clinicians at least reassess rather than call it a non, issue, especially combined with rapid weight loss.

Also, just to be clear.... we’re not talking about your experience. The OP’s situation is different: >4× ULN plus rapid weight loss. Different context, different level of caution.

And even in the screenshot you shared, it literally says to stop/adjust when lipase exceeds 3× ULN.

 

[Mounjamen]

Hallo, ich bin seit gut 2 Jahren hier dabei und habe 34 kg mit Reta abgenommen, zuerst Tirz bis 7,5 mg dann gewechselt, jetzt injiziere ich wöchentlich noch 2,5 bis 5 mg Reta als Erhaltungsdosis. Hat jemand von Euch auch Erfahrungen mit begleitendem Durchfsll gemacht und was habt ihr dagegen getan? Wird ja oft als Begleitumstand angemerkt. Sonst fühle ich mich wohl, nur meine Hautoberfläche ist empfindlicher geworden.
Hello,
I’ve been here for over two years now and have lost 34 kg with Reta. I started with Tirz up to 7.5 mg, then switched, and now I inject 2.5 to 5 mg of Reta weekly as a maintenance dose. Has anyone else experienced diarrhea as a side effect, and what did you do about it? It’s often mentioned as a common side effect. Otherwise, I feel fine; it’s just that my skin has become more sensitive.

 

[Mounjamen]

sorry a Try to translate:
I’ve been here for over two years now and have lost 34 kg with Reta. I started with Tirz up to 7.5 mg, then switched, and now I inject 2.5 to 5 mg of Reta weekly as a maintenance dose. Has anyone else experienced diarrhea as a side effect, and what did you do about it? It’s often mentioned as a common side effect. Otherwise, I’m doing well; it’s just that my skin has become more sensitive.

 

[Waterheater]

Thanks for all the feedback

I will follow up this thread in about one month. In the meantime if I don’t get any more side effects my plan is to continue 1mg dosage and aim for 1kg weightloss a week, take new blood test mid may and consider where I go from there.

The values are high and I hope some of the contributing factors is heavy exercising and fat loss.