This document provides information about different types of centrifuges used in medical laboratories, including their typical speeds, forces, capacities, and uses. It discusses small benchtop centrifuges, low-speed refrigerated centrifuges, high-speed centrifuges, ultracentrifuges, preparative ultracentrifuges, analytical ultracentrifuges, and different types of rotors. Ultracentrifuges can operate at speeds over 70,000 rpm and forces over 500,000g, allowing fractionation of viruses and membranes. Analytical ultracentrifuges have optical detection systems for absorbance, alternative schlieron, and Rayleigh scattering.