I believe it was mentioned that the zombies were rotting and smelled bad ect. That would indicate some kind of viral infection and no blood flow. So the blood depending on when the victim was bitten would thicken due to no blood flow. Fort Irwin, even with a "slow turn" even with a basic blood testing field kit would have some kind of anomaly. The soldier did mention that had blood from one that turned so you do have your control and ..lol zombie blood. There are doctors at fort irwin, that have lab equipment, it might be basic however...maybe the virus need better equipment to identify. Or its just one of those things you leave to the imagination.
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