The reference interval for hemoglobin varies with age. Which of the following age groups is associated with the highest hemoglobin level?

Which is a review for medical necessity of tests and procedures ordered during an inpatient hospitalization?

a. concurrent review b. discharge planning c. preadmission certification d. preauthorization

Which is not one of the three embryonic layers?

A. ectoderm B. mesoderm C. endoderm D. epiderm