A plausible mechanism is not an outcome, and this class is the textbook example.

Reference ranges differ between labs, so comparing two reports is close to meaningless.

The hologram is the least useful check because it is the one everybody makes.

Reference ranges differ between labs, so comparing two reports is close to meaningless.

Half of what people describe as tolerance is a change in the underlying condition, and the two need different answers.

You have two changes at once here. You cannot attribute anything until one of them moves. Not on a laptop battery but the pattern is familiar.