ASCP exam prep since 2012
Pass the ASCP MLS exam. One high‑yield page at a time.
Free high-yield notes, animated charts and a Mini Exam Simulator for the ASCP (ASCPi) MLS and MLT exams, from a certified MLS. Helping exam takers since 2012.
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X factor (hemin) and V factor (NAD)
Staph aureus secretes V factor (NAD), and its hemolysis breaks open the sheep red cells to release X factor (hemin). So Haemophilus grows only in tiny colonies right next to the staph, getting smaller the farther away they are. This is called satelliting. See the chart →
Leptospira
A spirochete spread by the urine of infected animals such as rats and cattle, or by water and soil contaminated with it. See the chart →
Coagulase-negative staphylococci (classically S. epidermidis)
Slime (biofilm) lets it colonize catheters and prosthetic valves, making it a leading cause of hospital-acquired infections. See the chart →
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