A lack of regulation at Queensland’s fertility clinics may have led to a donor fathering hundreds of children, sparking incest fears.

An investigation into the state’s assisted reproductive technology providers has also revealed claims of a couple receiving the wrong sperm.

Health Minister Shannon Fentiman said on Wednesday she was shocked by the Office of the Health Ombudsman’s damning findings.

Ms Fentiman had requested the investigation following more than 200 complaints.

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A key finding was the substandard record keeping of the number of sperm donations from a single man, with fears he may have fathered hundreds of children.

In one case, a woman reported the sperm donor she used had donated on more than 200 occasions at the same clinic, raising concerns about how many siblings her child may unknowingly have.

When investigating a number of clinics, the probe was unable to establish the number of families created or how many siblings a child may have from the same donor.

It said the excessive recurrent use of sperm donations in a number of fertility treatments could pose the risk of donor-conceived individuals “inadvertently having a sexual relationship” with a blood relative.

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The ombudsman recommended all stored donor material - eggs, sperm and embryos - that does not meet identification requirements be destroyed.