What is your mmHg threshold to cancel a kidney biopsy for patients with pre-procedural elevated blood pressures?

I am most comfortable doing a percutaneous kidney biopsy at a BP<140/90. Patients are often anxious prior to the biopsy and this can raise their BP. I usually administer an anxiolytic prior to the procedure. I also administer oral antihypertensives such as clonidine or short-acting nifedipine in the...