What markers? You are talking about drawing blood but what one should look for? Doesn't make much sense
In the United States, if you get tirz prescribed for diabetes/pre-diabetes or for obesity, most doctors will want to monitor bloods for allergic reactions, markers of normal side effects and markers of more rare but serious side effects like pancreatitis or gall bladder issues.
Now I know and already stated that most here are not like the avg Joe going to the doc to get Tirz. Still my opinion and advice were mostly based on my experience and what I have seen with others.
If you don't care or worry about possible side effects, then you wouldn't need to pull bloods. IMO, I want to rule out any dangerous side effects especially because I take other drugs. In addition to the above, there is much that is not known about Tirz (meaning clinical trials over time) so just to be safe, I recommend at least getting the basic CBC and metabolic panels and possibly an iron panel.
The reasoning: To check for markers like bilirubin, wbc counts, eosinophils, CRP etc.... Obviously a doc would look at glucose and A1C as well.
Some people do have an allergic reaction to tirz and can get violently sick although they may not get sick until they reach a certain threshold with their dosage. High eosinophils will likely result with that scenario. The other markers I mentioned would look for inflammation and possible issues with the pancreas, liver and/or gall bladder.
Anyway, just my opinion especially because many here don't follow the standard dosing protocol for Zepbound/Mounjaro. Those that don't follow the standard dosing tend to take less than what doctors prescribe and therefore if you are one of those people, perhaps it would not make much sense to worry about any sides and pull bloods.
One other point to consider if you source from a UGL is that you don't really know for sure what you are dealing with unless you have sent in a sample for HPLC testing. Another good reason to monitor your bloods if you dont test before taking.
PS- forgot electrolytes can get thrown off too with Tirz (usually due to dehydration) and CBC panels will include the most crucial electrolyte analyses.