As you are performing a rapid trauma exam of the chest, you note the presence of a crackling, rice-crispy-like sensation beneath the skin under the clavicles. This is MOST likely:

The percent of acidulated phosphofluoride (APF) used as a topical fluoride treatment is ____________

a. 2 b. 1.23 c. 10 d. It does not matter what percent is used

Mrs. Frantello brings her 3-year-old son David to the office because he seems a little behind other children his age. David has a rather long face with large ears. The physician orders tests for David to rule out fragile X syndrome. While she is in the office, she informs the physician that she is pregnant again. What test would you expect the physician to consider for Mrs. Frantello? 

A. Prothrombin time (clotting factor) B. Amniocentesis C. Phenylalanine concentration D. Complete blood count (CBC) E. Thyroid levels (T3 and T4)