Clinical and Molecular Cytogenetics Requisition Form XCell Laboratories offers a breadth of cytogenetics services in the state of Hawaii and brings testing closer to the patient and to improve care. XCell Laboratories offers a breadth of cytogenetics services in the state of Hawaii and brings testing closer to the patient and to improve care. XCell Laboratories offers a breadth of cytogenetics services in the state of Hawaii and brings testing closer to the patient and to improve care.