A 10-year-old patient is in hypovolemic shock.

Comprehensive and Detailed Explanation From Exact Extract:

Children compensate for shock through increasedheart rate,respiratory rate, andvasoconstriction, which delays blood pressure drop. Therefore:

Tachycardiais often thefirst sign

Prolonged capillary refill(>2 seconds) is an early indicator

Tachypneasupports perfusion

Blood pressureis alate signin pediatric shock. SpO₂ is helpful but does not specifically indicate shock. Blood glucose may be abnormal in other metabolic conditions but is not an early marker of volume loss.