The swab was not immersed in liquid, but the swab was slightly moistened. The lab must have immersed in a standard amount of extraction solution, which I do not know.
Yes swabbed area is 25cm2.
I assume this means that I cannot complete the conversion unless I know the amount of liquid which the lab used for the submersion?
I am not impressed by the units they used, I would have preferred g/swab. I will read the link you shared. Thank you!!
Re ^^^(red) - Yes, you will presumably need some feedback from Lab. The quantitative process is not exactly "simple".
Are you using a particular commercial Product/testkit ? If so, which one ? (This should detail how to proceed or offer technical backup on request).
The ELISA methodology typically requires extraction of the allergenic protein from the swab. The extract is then sampled/analysed.
JFI, I noticed this caveat for one commercial system -
How long can sample extracts and swabs be stored before testing?
Swabs can be stored for up to 24 hours at 4°C after sample collection provided they have not been extracted yet. Once extracted, samples from swabs should be evaluated within 4 hours. All other sample extracts should also be tested within 4 hours.
PS - you may also find this Production-oriented illustration of interest although (a) the included VITAL-interpreted material likely has geographically restricted useability and (b) note the words "extreme" / "homogeneously" -