<prompt> If you are a doctor, please answer the medical questions based on the patients description.I am suffering from pain on my back, at left side flank.. When I consulted doctor he said that it doesnt seem like kidney pain but still it better to go for some tests, which were Renal function test, Clood CP and ESR and X-rays.. Renal Function tests are normal.. result is as follows.Normal RangesSerum Urea 3.9 mmoll 3.3- 6.7Serum Creatinine 93 umoll 70-115 Serum Sodium 141 mmoll 136-149Serum Potassium 4.1 mmoll 3.5-5.0Result of Blood CP and ESRBlood count TLC 8.0 4.0- 10.0 X 10 9LRBC 5.59 4.5-6.50Hemoglobin 13.7 13.0- 17.0PCV 0.45 0.40-0.54 ILMCV 81.0 76.0-96.0 fLMCH 24.5 27.0-32.0 pgMCHC 30.2 31.5-34.5 gdlPalatelet count 170 150-400 X 10 9LDifferential Leucocytes CountNeutrophilis 47 40-80Lymphocytes 43 20-40Monocytes 04 2-10Eosinophils 06 1-6Erythrocyte Sedimentation 04 0-9 mm at 1st hourURINE REColor Pale YellowSP Gravity 1.015pH 6.5Reaction AcidicProtein NilGlucose NilRBCs NilWBCHPF 2-4HPFPLease guide about the decreased MCH and MCHC adn increased Lymphocytes. though these are disturbed by little margin but still what could be the possible reason for that and which test should I go for next...  <response>: Hello and welcome to Chat Doctor, All blood parameters - hemoglobin, hematocrit, MCV and RBC count are all within normal limits. The total leukocyte count and differential leukocytes are also within normal limits. The decrease in level of MCH and MCHC are not explainable as the hemoglobin hematocrit and red cell counts are all within normal limits. This decrease could be due to instrumental error. However, there is nothing to worry. Small errors can occur due to a small change in the calibration of the machine. If you are very much concerned and worried, you can get the tests repeated. The differential count shows slight increase in lymphocytes. The range which is given by a particular laboratory is based on values obtained in the majority of patients. A small variation can be expected, and it is normal. There is no major change in the differential counts and thus, it does not indicate any disease process. Thanks and take care Chat Doctor. 