The nurse provides which instruction to the patient who will undergo guaiac stool testing?

The 82-year-old patient presents to the emergency department with chest pain that started four hours ago. Vascular access is a challenge and the nurse is only able to draw enough blood for one test. The nurse sends the sample to the lab for which test?

The 5-day-old infant presents to the pediatrician's office for a well-baby visit. The parents report being happy that their child is a "good baby" who sleeps a lot and rarely cries. They also report the baby eats 4 times per day, sleeping for 8 hours at night. The nurse notes the baby is at the 70th percentile for weight. Upon assessment, the baby is minimally responsive. The nurse is most concerned about which condition?