Covid Positive. He continue medicines?

My husband tested positive on 26th April in rapid test with mild symptoms and doctor have started covid medication right  away ...After 2 days RTPCR result came with CT Value 24.53  and his Bllood test reports are as given below CRP  - 1.22 mg/L D-Dimer - 0.08 LDH  -  264 Ferritin - 346.1 Took Rtpcr test again on 12th day of isolation but the result came as Positive showing CT Value ( N gene ) 12.91 and CT value ( Rdrp )  13.35 ...... it's been 16 days  he is under isolation taking all medicines and he has no fever , No cold but getting little cough when speaking from the 3rd day itself ..Now he is fine with no symptoms except little cough.... We are confused with 2nd Rtpcr CT values ...is that a false positive result because only nasal swab sample was collected not from the throat.. Kindly help us what to do now ...Shall  my husband end his isolation and should he continue medicines ?