What is the recommended RPM for the rotator used in VDRL tests?

In VDRL (Venereal Disease Research Laboratory) tests, the recommended rotor speed is typically around 180 RPM. This speed is optimal for ensuring that the serum and antigen mixture is adequately mixed during the test, allowing for the proper development of flocculation, which is the basis for detecting specific antibodies associated with syphilis.

At this RPM, the centrifuge facilitates an even distribution of components in the reaction mixture, which is essential for obtaining reliable results. If the rotor speed is too low, it may not achieve the necessary mixing and can lead to reduced sensitivity of the test. Conversely, if the speed is too high, it may disrupt the reaction, potentially leading to false negatives.

Thus, the recommendation of 180 RPM strikes a balance that ensures effective mixing while maintaining the integrity of the reaction. This precision in testing conditions is critical in immunoserology, as it directly influences the diagnostic outcomes.