I don't know what is the actual lab test usage, but judging by the first link that I found when entering "RT-PCR Ct vērtības", the recommendations as of December 2020 were:

1) RT-PCR Ct values appear to show the infectiousness of patient during the first 9 days of symptoms. After the 9 days, the Ct test *can't be used to determine anything much*.

2) The values for Ct as per recommendation are:

<20 Ļoti infekciozs pacients, vīrusa koncentrācija organismā augsta
21-25 Vidēji infekciozs pacients
25-30 Zema iespēja inficēt kontaktpersonas
>30 Pacients, visticamāk, nav infekciozs

Source appears to be Mikus Gavars, Didzis Gavars (E.Gulbja laboratorija); Uga Dumpis, Aija Vilde (P.Stradiņa KUS), but the site where I found this: http://idready.lv/ (apparently 'infectious disease ready') is interesting by itself as it appears to be an unnamed site linked to Stradina hospital (judging by the materials found there) providing easy access materials targeted at medical professionals.

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45 - +ve ja CT<40 diviem gēniem.

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