A client with a nasogastric (NG) tube in place. Before giving a tube feeding, which action is the FIRST priority?

NASOGASTRIC TUBE FEEDING SAFETY: confirming tube placement BEFORE each feeding is a CRITICAL PATIENT SAFETY STEP. A misplaced tube (in the respiratory tract) with feeding infusion can cause ASPIRATION, PNEUMONIA, and potentially DEATH. TUBE PLACEMENT VERIFICATION: RECOMMENDED — ASPIRATION AND pH TESTING: aspirate gastric contents; gastric contents have pH < 5 (acidic); intestinal fluid is 6-8; respiratory fluid is >7; confirm pH before each feeding; AUSCULTATION OF AIR ('whoosh' test — inserting air and listening) is NOT RELIABLE as a primary confirmation method and should not be used as the sole method — bowel sounds can be transmitted to the respiratory tract; RADIOGRAPHY (X-RAY): GOLD STANDARD for initial placement confirmation — mandatory after initial NG tube insertion; visual confirmation of tube tip in the stomach; AFTER INITIAL X-RAY CONFIRMATION: subsequent checks before each feeding use pH and aspiration; CHECKING RESIDUAL: after confirming placement, aspirate to measure GASTRIC RESIDUAL VOLUME (GRV) — how much feeding remains from previous feeding; high residual (typically >250-500 mL, per facility policy) may indicate delayed gastric emptying; follow facility protocol (may hold feeding, notify RN, or continue feeding depending on clinical situation); replace aspirate to avoid losing gastric acid and electrolytes. ADDITIONAL SAFETY MEASURES: POSITION: elevate HOB 30-45° during feeding and 30 minutes after to reduce aspiration risk; RATE: start slowly, advance per orders; FLUSHING: flush tube with 30 mL water before and after feeding and medications; ASSESS for ASPIRATION SIGNS: coughing, choking, desaturation, respiratory distress. PN ROLE: verify placement per protocol; check residual; position client; administer feeding as ordered; monitor for complications; flush appropriately.