Microbiology Most sensitive investigation for preoperative localization of abnormal parathyroid glands is A Neck ultrasound B (99mTc) labelled Sestamibi isotope scan C CT scan D MRI 💡 Explanation Most sensitive investigation for preoperative localization of abnormal parathyroid glands is ✓ Correct Answer: B. (99mTc) labelled Sestamibi isotope scan