Which of the following is NOT part of the colic work-up?

The work-up for colic in infants typically involves a thorough examination to rule out any underlying conditions that may present with similar symptoms. Assessing for jaundice is not standard practice in the evaluation of colic, as jaundice typically indicates a liver or hematologic issue that does not directly relate to the common causes of colic, which include gastrointestinal discomfort and infantile irritability.

In contrast, palpating long bones, inspecting digits and the penis for hair tourniquet, and checking the skin for bruises are pertinent parts of the colic work-up. Palpating long bones helps to ensure there are no fractures or other skeletal concerns contributing to the infant's discomfort. Inspecting for hair tourniquets is essential because tightly wrapped hair can cause pain and potentially compromise circulation, leading to distress that mimics colic symptoms. Evaluating the skin for bruises is important to rule out physical trauma or abuse, which is crucial in a pediatric assessment when an infant presents with unexplained crying.

Thus, among the options provided, assessing for jaundice is rightly excluded from the colic work-up.