Well, soon you might be able to. AliveCor has created an ECG monitor, which is awaiting FDA approval, that attaches to the back of your iPhone.
This would definitely qualify as an iPhone accessory you don’t want to need, but is intriguing at the same time. This is just one product that shows how powerful the iPhone is. If you think about it, the iPhone is more powerful than computers were just 10 years ago.
If you want to take a nap go ahead and press play on this video explaining the device.