If you're one of the 8 million Americans who donate blood each year, you know that before you can give from the arm, you're going to get stuck in the earlobe or fingertip. This predonation anemia test boosts the nurse's risk of blood exposure and adds to the bill for biohazardous-waste disposal. Philadelphia-based Cytometrics plans to put an end to those problems with the Hemoscan, a device that tests blood-without drawing any.

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