Final answer:
The nurse should plan to perform a finger stick to collect the sample from the toddler for a sickle-turbidity test.
Step-by-step explanation:
The nurse should plan to perform a finger stick to collect the sample from the toddler for a sickle-turbidity test. This is a procedure in which a small puncture is made on the finger to obtain a drop of blood. The blood sample can then be used to determine the presence of sickle-shaped red blood cells, which is characteristic of sickle cell disease.