Final answer:
The manifestations of a client receiving packed RBCs can include an allergic reaction, febrile reaction, or fluid overload, as evidenced by symptoms like itching, temperature, or oxygen saturation.
Step-by-step explanation:
The manifestations of a client receiving a unit of packed RBCs can indicate an allergic reaction, febrile reaction, or fluid overload. These manifestations can be evidenced by certain symptoms such as itching, temperature, or oxygen saturation. For a client experiencing an allergic reaction, itching would be a common symptom. In a febrile reaction, a rise in temperature would be observed. In case of fluid overload, oxygen saturation levels can be affected.