A business claiming to offer fetal gender testing is advertising for delivering blood samples from mainland China to Hong Kong as of Thursday, despite city health authorities warning that such services require prior approval, the Post has learned.

According to its website, HK LongKang DNA can provide testing services from as early as four weeks of pregnancy with a 99.995 per cent accuracy rate.

The company charges HK$3,000 (US$385) for testing at the six-week mark, with same-day appointments available and a six-hour wait for the report.

But the website did not include an address for the company, instead instructing customers to contact it via WhatsApp or WeChat.

It did note that blood samples collected on the mainland would be sent to two Hong Kong-based laboratories – Medtimes Medical and RoxyDNA.

The website’s “about us” section had a one-minute video that introduces Medtimes Medical, with the page also including addresses for the laboratory.