Does lipase tell me anything about hepatic fat on cagrilintide?

The specifics, since they change the answer: lipase · cagrilintide.

The empirical answer seems settled. The explanation does not.

If the honest answer is that nobody knows, I would rather hear that than a plausible story.

What is the causal chain, and where does it stop being established?

The short version: enzymes in this class usually fall as weight falls, and a rise is a reason to look for a cause rather than to assume a drug effect.

Hy's law describes the combination that matters: transaminases above three times the upper limit together with bilirubin above twice the upper limit and no cholestatic explanation. That combination is a signal; isolated mild transaminase elevation is not.

More usefully, an isolated result three weeks after starting anything is difficult to interpret. A baseline taken before starting makes the same result trivially interpretable, which is the argument for baselines.

Nothing here is medical advice. An abnormal result needs somebody who can take a history and examine you.

Transaminases plus bilirubin plus alkaline phosphatase, or you have not measured enough to conclude anything.

Answering this needs the magnitude in multiples of the upper reference limit, because the thresholds that matter clinically are defined that way and not in absolute units.

Gamma-glutamyl transferase is sensitive and unspecific: it rises with alcohol, with several medications and with fatty liver, and an isolated elevation rarely changes anything on its own.

Concretely, alanine aminotransferase is relatively liver-specific; aspartate aminotransferase is also present in muscle, heart and red cells. A raised AST with a normal ALT after heavy resistance training is usually muscle, and creatine kinase settles the question.

Laboratory-specific reference intervals for transaminases vary enough that cross-laboratory comparison of borderline values is unreliable.

Research-use material of unknown content is an unquantifiable variable in any such attribution.

Isolated mild elevation is common and usually improves with weight loss.