Which component helps verify proper suction alignment of the system?

• A. The delta mark alignment on the E chamber
• B. The drainage color
• C. The external monitor reading
• D. The bellow's alignment with the delta mark in the E chamber

Answer: (D)

In suction-controlled chest drainage systems, the way you confirm the actual suction delivered is by looking at the suction-control chamber. The bellows inside that chamber move with the suction, and the delta marks provide the reference for the set pressure. When the bellows are aligned with the delta mark, you know the system is delivering the intended negative pressure. This direct, internal indicator is why the bellows’ alignment with the delta mark is the best way to verify proper suction.

Drainage color reflects the fluid being drained, not the suction level. An external monitor reading can help, but it may not always reflect the exact suction at the patient due to system variations. So the key check is the bellows alignment with the delta mark in the suction-control (E) chamber.