In ATLS management, which hemorrhage class requires blood transfusion as a first-line resuscitation fluid (not crystalloid alone)?

• A Class I (up to 750 mL blood loss)
• B Class IV (>2000 mL) ✓
• C Class II (750–1500 mL)
• D Class III (1500–2000 mL)

Explanation

ATLS hemorrhage classification: Class I and II may be managed with crystalloids. Class III (1500–2000 mL, approximately 30–40% blood volume) typically requires crystalloids and blood products. Class IV (>2000 mL, >40% blood volume) is immediately life-threatening and requires aggressive resuscitation with blood transfusion as the primary fluid, often in a 1:1:1 ratio of pRBC:FFP:platelets under damage control resuscitation principles, alongside emergency hemorrhage control.

Reference: Bailey & Love's Short Practice of Surgery, 27th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.