There are three responses to mild blood loss: Stage 1) transcapillary refill, leaving an interstitial fluid deficit; Stage 2) activation of renin-angiotensin-aldosterone; Stage 3) production of erythrocytes within a few hours Stages of Shock (Severity) Parameter Class I Class II Class III Class IV % Blood loss < 15% 15 – 30% 30 – 40% […]