A 22 year old MLS student was preparing to go to professional practice and needed to find out their immune status for Rubella.

A 22 year old MLS student was preparing to go to professional practice and needed to find out their immune status for Rubella. A titer was ordered and a member of the immunology staff set the following protocol for a Rubella titer. A total of 9 tubes were labeled 1-9 and set let to right in the rack. Next, 0.75 ml of reagent A was added to all 9 tubes. Next, 0.25 of patient serum was added to tube 1, mixed and then 0.25ml of that mixture was transferred to tube 2, mixed and 0.25 ml of that mixture was added to tube 3. This continued until tube 8 when the 0.25 ml removed after mixing was discarded. Reagent A was red in color and was the only reagent added. This specimen had been correctly drawn on this same day and stored correctly until the test was set up. The package insert indicated that the titer of the specimen for Rubella antibodies was determined by the last tube in which there was visible red color. The break point for being considered immune to Rubella was a titer of 64 or greater. 1. Using the diagram below, answer the following questions. 1 2 3 4 5 6 7 8 9 Indicate the tube number, the dilution, and the titer that would be used in determining the Rubella immunity status for this patient. Tube #: Dilution: Titer: 2. Would this patient be considered immune to a Rubella infection? YES or NO 3. Explain why you chose the answer in question 2.