Join the First Aid/USMLE-Rx Team

Greetings First Aid and USMLE-Rx fans! Each year more than 150,000 students and physicians trust First Aid for the USMLE, USMLE-Rx Qmax, First Aid Flash Facts, and First Aid Express videos for critical exam prep and curricular coursework. We hope that you have also benefited from these resources, […]

Express Video of the Week: Enzyme Kinetics

Sarina Bang leads you through an exploration of enzyme kinetics, including ways to differentiate reversible competitive inhibitors, irreversible competitive inhibitors, and noncompetitive inhibitors. She also helps you understand Michaelis-Menten kinetics and Lineweaver-Burk plots, as discussed in First Aid for the USMLE Step 1. Learn more about the USMLE-Rx […]

USMLE-Rx Step 1 Qmax Challenge #1649

A 33-year-old man presents for a follow-up visit after his pre-employment health screen revealed a concerning finding. He has lost 25 pounds over the last 4 months but claims that he has not altered his usual exercise or dietary habits. He reports having a productive cough during the […]