Ultrasound measurement of skin-to-septum distance in totally implantable venous access ports: Considerations for Huber needle length

Background: Objective criteria for selecting Huber needle length for totally implantable venous access ports (TIVAPs) are limited. This study primarily described skin-to-septum distance using ultrasonography and its correlation with body habitus. Methods: Thirty-three patients with TIVAPs for chemotherapy were included. Skin-to-septum distance was measured by ultrasonography in two positions: supine with arms at the sides and with shoulder flexion. Pearson’s correlation coefficient assessed correlation between body mass index (BMI) and septal depth. Excess needle length beyond the port base was calculated. Results: Mean skin-to-septum distance was 1.7 ± 0.4 mm (arms at sides) and 1.8 ± 0.5 mm (shoulder flexion). A 16-mm Huber needle was used in 97.0%. The median excess needle length was 2.4 mm. BMI showed weak correlation with septal depth ( r = 0.33, p = 0.062). Conclusions: Septal depth was shallow, and BMI alone was not a reliable predictor. Ultrasound may support Huber needle selection.