In planning elective foot/ankle procedures for an HIV-positive patient, the CD4 threshold to proceed with surgery is?

• A. 150 cells per microliter
• B. 200 cells per microliter
• C. 250 cells per microliter
• D. 300 cells per microliter

Answer: (B)

The main concept is that the safety of elective surgery in HIV-positive patients depends on immune function, as reflected by the CD4 count, with a commonly used cutoff around 200 cells per microliter. This threshold is chosen because when CD4 counts fall to about 200, the risk of opportunistic infections (and impaired healing) rises significantly, which can compromise operative outcomes and recovery. In the setting of foot and ankle procedures, where wound healing and infection risk are critical, ensuring the patient’s immune system is relatively intact helps minimize postoperative complications. Counts at or above 200 generally allow proceeding with elective surgery under standard perioperative care, provided the patient is on effective antiretroviral therapy and has a suppressed viral load.

The other numbers are not the standard minimum threshold used for planning elective procedures. A count of 150 would be considered too low, increasing infection risk, while 250 or 300 are higher than the typical cutoff and might be acceptable in certain well-controlled cases, but the widely taught safety limiting value for elective surgery is 200 cells per microliter.