When taking clozapine for schizophrenia you need to monitor

• A. Blood Work
• B. Urinalysis
• C. ECG
• D. Thyroid Function

Answer: (A)

Clozapine carries a serious risk of agranulocytosis, a dangerous drop in white blood cells that can lead to severe infections. Because of this, patients must have regular blood tests to monitor white blood cell count and absolute neutrophil count (ANC). The monitoring plan typically starts with a baseline test and then frequent checks—often weekly for the first six months, then every two weeks for the next six months, and monthly thereafter, with specific thresholds that require holding the medication if ANC falls below a certain level. This is why blood work is the essential monitoring choice.

Urinalysis, ECG, and thyroid function aren’t the primary safety monitoring for clozapine, though other tests might be ordered for broader medical care in some cases. The key safety concern that drives monitoring is the hematologic risk, hence blood work is the correct focus.