It depends if the laboratory is internal or external.
I know that some PPAP's include the suppliers certificate in the laboratory divider,( because they have to put 19 dividers and need to waste paper

)
If the laboratory is internal- that of the supplier then in QS this is acceptable.
TS also does not require registration to ISO 17025, see note to 7.6.3.1.
If the laboratory is external/commercial/independent- then they must be ISO 17025 or approved by your customer.