meanmaryjean
Verified RN (Pediatrics Specialty)
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Here's to answer part of my blood question.
Even accounting for viscosity and the diameter of the needle, a blood test would need minimally many drops of blood.
https://www.quora.com/How-many-drops-are-present-in-1ml-of-blood
Holmes was claiming "a drop" and "a few drops" per the indictment.
I assume tests wouldn't work with lower quantity than the minimum current quantity of 0.5 ml on test. If it were possible, it would have been done already? Makes no sense to me why this would be a viable proposition for Theranos even to attempt this.
I'm also thinking blood coagulates quickly if you prick your finger and collect it from the surface, and this would undoubtedly throw off a test? And there would be a contamination problem from whatever was on the surface of your finger?
There already exists what we call POC (Point of Care) testing. Think glucometers for checking blood sugars. And a device called an iStat can (in a hospital environment) run a couple dozen commonly ordered tests at the bedside. For example, in my former job in a Peds ICU- we used iStats extensively for blood gas monitoring, lactate, electrolytes, hemoglobin/ hematocrit - common things any critically ill child would need tested for frequently. These devices used a cartridge that took about 0.3mL of blood- and could be obtained by a finger or heel prick (you of course cleaned the skin with alcohol first!). ALL of these tests can be performed on whole blood (in other words- they did not need to be spun in a centrifuge and have components separated). To your clotting queston- there is an anticoagulant embedded in the testing cartridge of the iStat- it keeps the blood from clotting while the test is being run. Processing time is 1-2 minutes.
So Theranos/ Holmes was claiming thousands of really sophisticated multi-step tests requiring component testing (serum/ plasma) could somehow magically be done on just a couple drops of blood.
And to your previous post- I vote psychopath / liar.