How much does the antigen needle for the qualitative VDRL test deliver?

The qualitative VDRL (Venereal Disease Research Laboratory) test is a non-treponemal test used to detect antibodies that may indicate an active infection with syphilis. The antigen used in this test is typically delivered by an antigen needle, which is calibrated to provide a specific volume and number of drops.

In this case, the correct delivery rate of the antigen needle for the qualitative VDRL test is 60 drops/mL. This calibration is designed to ensure that the test provides an appropriate concentration of antigen, which is vital for the test’s sensitivity and reliability. Maintaining the correct number of drops per milliliter allows for consistency across tests, ensuring accurate results when evaluating the presence of antibodies in the patient's serum.

The choices that provide other drop rates are not utilized in this context for the VDRL test, as they do not correspond to the standard used in practice. This consistency in practice supports accurate diagnostics in clinical settings.