What are the health requirements before getting a BBL?

Thank you for your question. You need to be in good health with a BMI of 30 or less and you will need to pass all lab tests and clearance successfully. I would advise you to schedule a consultation with a board
certified plastic surgeon for a detailed examination to discuss all possible
treatment options and what your expectations are. 

Hello dear!
In general, you need to be physically healthy and at a stable weight, have realistic expectations, be a non-smoker, your BMI needs to be 30 or less and hemoglobine levels higher than 12.5.
I recommend you to make an appointment with a board certified plastic surgeon to talk about your goals and anything you need to know.
Dr. Luis mejia.  

This will vary from office to office and in regard to your medical health and age.  Most surgeons will do some blood work prior to surgery, but some surgeons do not if you are young and healthy.  It is always best to ask these questions of your chosen surgeon as recommendations may be different.
The surgeon you select should know everything about your past medical and surgical history and be able to make a determination about what labs should be ordered, the need for EKG, the need for medical clearance, the need for anticoagulation, the appropriateness of the surgical intervention based upon the risk factors and current physique, etc.