Hi, guys! I Long time no see! have some news, I will be starting T pretty soon!
I've wanted to ask, what makes a doctor prescribe a lower dose of T? The weight/height? The blood results? Could iron deficiency stop me from getting on T now? I'm sorry if all these questions seem stupid, I'm new to this... I've been waiting for years and now that it is here it feels like someone or something is going to snatch it away f

Might be because of hematocrit, if the RBC is high they could prescribe a reduced dose.

Hey! Congrats on starting soon

I can only speak for the 2 doctors I've talked to but they both like to start people off on a low dose so they can see how their body reacts and then have them come back in to check blood work to see what's going on and if all checks out they will up the dose.  I think it has a lot to do with how much of a risk you have. I am really heavy, blood pressure is okay and my cholesterol needs some work but that didn't stop the doctor from clearing things. I feared that it might at the time but he was totally cool with the whole lets make a plan to work on some of these factors and we'll keep an eye on things. I'm not really sure about problems with iron though but I bet that it's something that can be sorted out.

Congrats!
I'm really heavy as well, and I was referred to a nutritionist by my endo to help me lose weight. Overall my blood pressure and my bloodwork checked out, other than my cholesterol being slightly elevated.
I don't think there's much that can affect whether or not you're able to start T, but some things can affect the dosage.
The thing that got me on a super low dose was PCOS. I already had high testosterone, and since I had PCOS and was at risk for certain diseases that T would put me at risk for even more, my doctor erred on the side of caution.
My doctor prescribed the T before she got my blood results back, so unless you have some sort of condition like PCOS, you should be put on a low-normal dose, and after a while of adjusting it should be upped. That's just my experience!