Techniques for elevating CD34+ cell level in peripheral blood using light are disclosed herein. In one example, a light generating device is positioned to a body part of a patient, and a beam of light generated by the light generating device is directed to the body part of the patient to increase CD34+ cell level in the peripheral blood of the patient. In various embodiments, the beam of light is direct to a body part of the patient that is CD34+ stem/progenitor cell and/or precursor cell that give rise to CD34+ stem/progenitor cell rich. In various embodiments, the body part is the abdomen of the patient rich in adipose tissue. In various embodiments, the light beam has one or more wavelength in the range of 400 to 1300 nm. In various embodiments, the light beam is a low intensity light beam of generated by a power of 1-12 mW.
