When a woman is more than seven or eight weeks of pregnancy, she can choose a blood test to know the sex of infant. Compared to other methods of sex identification, the accuracy of this test is the highest (98%),and also the safest way. Its principle is: the nucleus of normal human cells has 23 pairs (46) chromosomes. 22 pairs (44) is an autosomal unrelated to sex, to decide other genetic traits, only one pair of sex chromosomes determines gender. Sex chromosome is divided into two kinds of X and Y chromosomes. As measured by sex chromosomes X and Y, XY type, that is male; such as the the XX type that women.

The processes of Hong Kong DNA identification

  1. the client's gestational age at least seven or eight weeks and submitted a ultrasound examination result with local medical certificate indicate the gestational age;
  2. pay blood test costs (7 weeks and 8 weeks charges are not the same);
  3. fill in the Hong Kong Laboratory Registration forms;
  4. medical professionals collected 18ML blood samples (each tube 6ML) into K3 blood vessels, which Hong Kong Laboratory exclusive supplier
  5. after blood samples were sealed packaging sent to the testing center;
  6. The test results probably takes 3-5 working day (from the day of received blood sample), the first time result will be send to client by fax and the original report will after two weeks.

To have gender identification must meet the following four requirement before you can do:

  1. Gestational age must be at least seven or eight weeks, and has submitted a ultrasound examination result with local medical certificate indicate the gestational age.
  2. No childbirth of male fetuses within one year.
  3. No blood transfusion, major surgery and organ transplantation within one year.
  4. common blood type: A, B, AB or O.