كُتب لمريض هيبارين ٥٠٠٠ وحدة تحت الجلد، والقارورة المتوفرة ١٠,٠٠٠ وحدة/مل. كم مل يُعطى؟

Heparin 5000 units subcutaneously is ordered, and the vial is 10,000 units/mL. How many mL are given?

1. 5 mL
2. 2 mL
3. 0.5 mL
4. 0.05 mL

Answer: C) 0.5 mL. Volume = dose ÷ concentration = 5000 ÷ 10,000 = 0.5 mL. Heparin is high-alert, so the calculation and concentration are independently double-checked per policy.