Final answer:
The threshold for IV fluid administration in burn patients is >15% TBSA in adults and >10% TBSA in children, with option C (>15% TBSA) being the correct choice for needing IV fluids in adults.
Step-by-step explanation:
For burns requiring intravenous (IV) fluids, the threshold is a burn size greater than 15% Total Body Surface Area (TBSA) in adults and greater than 10% TBSA in children. Therefore, the correct answer to the question regarding what percentage of TBSA burns require IV fluids is >15% TBSA for adults, which corresponds to option C. When assessing the need for specialized treatment, including fluid resuscitation, it's vital to calculate the size of a burn accurately. Specific parts of the body are associated with a percentage of body area, helping medical professionals to determine the TBSA. Moreover, if there's a risk of significant blood loss, suitable vascular access and the administration of fluids are critical to patient outcomes.