DataDave said:

My experience ordering cross-border ordering internationally: I've ordered from an Indian manufacturer.

Pushing back on DataDave here. Import rules are jurisdiction-specific and this board keeps giving US-shaped answers to non-US questions. What is a personal-import allowance in one country is a controlled-import offence in another.

Adding the numbers, since they settle part of this. Worth stating the units and the reference range whenever you post a number here. A large fraction of the apparent disagreement in these threads is two people using different units and both being right.

Dr.BariatricHTX said:

Import rules are jurisdiction-specific and this board keeps giving US-shaped answers to non-US questions.

Coming at Dr.BariatricHTX’s question from a different direction. Order of operations matters more than any single choice here: establish a baseline, change one thing, wait long enough for it to express itself, then measure again under the same conditions.

One thing that is still open after bbq_ray_KC’s answer:

What did you change at the same time, and can you separate the two now?

Closing the loop on my own question.

Following up because I said I would. I changed one thing, left everything else alone, and waited the full interval before looking. It resolved, and I cannot prove which half of that did it.