Why DSO < 30 Matters for Healthcare Practices DSO (Days Sales Outstanding) measures how long it takes to collect payment after services are delivered. A DSO above 30 days ties up cash and slows growth. Achieving DSO < 30 shows operational discipline across scheduling, billing, and collections. This is crucial for maintaining a healthy cash flow in any healthcare practice. Targets to Aim For To ensure your practice runs smoothly, aim for these key performance indicators: DSO: