A nurse is assisting with the collection of a bone marrow specimen from a preschooler.Which of the following actions should the nurse take?

Choice A rationaleBone marrow collection is not typically performed by positioning the child side-lying to expose the vertebrae. This position does not provide easy access to common collection sites such as the iliac crest. Instead, it is usually reserved for procedures involving the lumbar spine, such as lumbar punctures.Choice B rationaleThe prone position exposes the posterior iliac crest, which is the most common site for bone marrow aspiration and biopsy. This position provides optimal access while minimizing discomfort and maintaining stability in younger patients during the procedure.Choice C rationaleThe supine frog-like position is not suitable for bone marrow collection as it does not allow exposure to standard sites such as the iliac crest. This position may be more commonly used for pelvic procedures such as catheterization or genital examinations.Choice D rationaleThe sitting position with buttocks at the edge of the table is also inappropriate for bone marrow collection. This positioning fails to provide adequate exposure to the posterior iliac crest, a primary site for bone marrow aspiration. It may also compromise the child’s stability during the procedure.