Absence of the Moro reflex on one side of a neonate may indicate which condition?

The absence of the Moro reflex on one side of a neonate can indicate a fractured clavicle. The Moro reflex, also known as the startle reflex, typically involves the infant spreading their arms out and then bringing them back in when they feel a sudden loss of support or hear a loud noise. If there is an injury, such as a fractured clavicle, it can lead to a limitation in the movement of the affected arm, which may result in an asymmetric response to the Moro reflex.

In cases of a fractured clavicle, the infant may not exhibit the normal reflex action due to pain or discomfort when the affected arm is moved. Assessing for symmetry in reflexes is crucial in neonatal examinations, as it helps to identify possible injuries or neurological issues. Thus, a lack of response in one arm during the Moro reflex can signal a need for further evaluation to determine the presence of a fracture or other injuries.