u/crp_curious

What did the referral letter actually say?

Have you seen the current threshold published by your ICB?

NHS pathway or private prescription?

Supply notices from the regulator describe expected availability at a national level. They do not predict what any individual pharmacy has on the shelf next week.

On inter-lab disagreement, which generates more heat here than anything else.

Two services running different gradients, integrating differently, at possibly different wavelengths, will not produce identical numbers on the same material. A point either way is ordinary. Half a point is close agreement.

The productive response to a gap that size is to post both results with both methods and let the log accumulate. The unproductive response is to pick the lower number, call it the truth, and open a dispute. Members have done the first for long enough now that the bands in the vendor tables are genuinely informative.

Split one vial between VendorInvestigate and PeptideMeter. The two numbers were within half a point of each other and I stopped worrying about which lab to trust.