Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Langerhans cell histiocytosis ?
    ### Response:
    How is Langerhans cell histiocytosis diagnosed? Testing for Langerhans cell histiocytosis (LCH) may include bronchoscopy with biopsy, x-ray, skin biopsy, bone marrow biopsy, complete blood count, and pulmonary function tests. Because LCH is sometimes associated with cancer, CT scans and a biopsy may be done to rule out possible cancer.
    