Needle biopsyNeedle biopsy is an ambulatory surgical procedure. A fine needle is used to aspirate the contents of thyroid nodules to study the composition and ascertain the need for further surgical interventions. Mass spectrometry is an assay in which several different hormone concentrations can be simultaneously analyzed. Computed tomography scans are useful for evaluation of ovaries, adrenal glands, and the pancreas. The average blood glucose level over 2 to 3 months is revealed by a glycosylated hemoglobin test.