The general process of paternity test should be: the appraisal institution accepts the entrustment of the client → the two parties sign the entrustment agreement → the collection and reception of samples → the sample number → the extraction of sample DNA → the amplification of the target gene → the product analysis → the determination of the kinship of the appraiser → the issuance of the appraisal opinion report.

If you just doubt the relationship between your child and yourself, you can collect samples of your child's hair, oral swab, blood stains, etc. to the appraisal institution for appraisal. However, the appraisal results can only be used for their own reference and cannot be adopted as valid evidence by state organs.

On the question of paternity test, you can consult the Judicial Appraisal Center of Jinan University.