A nurse is evaluating the allergy profile of a client who has Graves' disease and is to undergo a thyroid scan. The nurse should identify which of the following allergies as a contraindication for the client to undergo a thyroid scan?

A. Decreased serum osmolarity: Fluid volume deficit typically leads to an increase in serum osmolarity due to concentration of solutes in the blood, not a decrease.

B. Decreased hematocrit: Dehydration causes hemoconcentration, leading to an increase in hematocrit, not a decrease.

C. Elevated blood urea nitrogen (BUN): Dehydration results in decreased renal perfusion and concentration of urea in the blood, leading to elevated BUN levels.

D. Lower urine specific gravity: Dehydration causes increased urine concentration, resulting in higher urine specific gravity, not lower.

A. A client who is 3 hr post Foley catheter removal and has not voided - While this may require assessment, it is not as urgent as assessing a client with potentially significant respiratory complications.

B. A client who is 3 days postoperative colectomy with a large, loose melena stool - While melena may indicate gastrointestinal bleeding, the client is not actively experiencing a respiratory issue.

C. A client who is 1 day postoperative total hip replacement with a pain level of 7 on a scale of 0 to 10 - Pain is important to address, but it is not as urgent as respiratory distress.

D. A client who is coughing up pink-tinged sputum following a bronchoscopy and lung biopsy 1 hr ago - Pink-tinged sputum may indicate bleeding from the respiratory tract, which could be a complication of the procedure and requires immediate assessment and intervention.