He said one of such companies is from Alabama.
Mr Cretz made this known during a courtesy call on Ms Sherry Ayittey, Minister of Health in Accra.
A statement issued by Dan Osman Mwin, Head of Public Relations at the Ministry of Health (MOH) and copied to the Ghana News Agency said the call was aimed at strengthening the cordial relations between US Embassy and the Ministry.
Ms Ayittey called for collaboration to scale down malaria and HIV and AIDS cases in Ghana.
She said Ghana needs to draw more lessons from the US especially in the area of family planning, maternal and child health issues.
Ms Ayittey acknowledged the support the MOH is getting from United States Agency for International Development (USAID) in the revision of its procurement process.
This, she said would improve the supply chain of drugs in the country.
The Minister said Ghana seeks more assistance in training emergency medical technicians, procurement of ambulances and building of trauma and orthopaedic centres.
Cheryl L. Anderson, USAID Missions Director in Ghana, and Laurel Fain, USAID Office Director of Health, Population and Nutrition, who accompanied the Ambassador, recalled the work the Agency have done in the area of maternal and child health and pledged continuous support to the Ministry.