Sub test()
For n = 1 To Sheets("provisoir").Range("A" & Rows.Count).End(xlUp).Row
a = Sheets("provisoir").Range("B" & n) & "," & Sheets("provisoir").Range("A" & n) & ","
For m = 3 To 13
If m > 7 And m < 12 Then
x = Replace(CStr(Sheets("provisoir").Cells(n, m)), ",", ".")
Else
x = Sheets("provisoir").Cells(n, m)
End If
a = a & x & ","
Next
Sheets("labo").Range("A" & n) = Left(a, Len(a) - 1)
Next
End Sub