Hi David, Thanks for your message. That's a good way of looking at the issue. Certainly, very pragmatic and what most blood banks do. However, what's the cost of that blood unit you're disposing? And what's the cost of the 2 blood units you'd be disposing if the donor returns? Wouldn't just that justify the investment in a molecular test? Sorry I'm playing the devil's advocate here, but I'm enjoying the discussion. Again thanks for your views. Regards