<prompt> Physiological leukocytosis is seen inInfancyPauritionPost prandialALL of the above  <response>: Physiological leukocytosis i.e.,increase in the number of circulating leucocytes in the absence of infection or tissue injury has no clinical significance. It is seen in the following conditions: 1. Normal infants: The count may be as high as 18-20,000mm3 but it returns to normal level within 1-2 years. 2. Food intake and digestion digestive leukocytosis:There is a mild increase which returns to normal within an hour or so. 3. Physical exercise. 4. Mental stress. 5. Pregnancy: The count may be quite high, especially during the first pregnancy. 6. Paurition: The high TLC is possibly due to tissue injury, pain, physical stress and hemorrhage. 7. Extremes of temperatures: Exposure to sun or to very low temperature can increase the WBC count. 