If a person is under tremendous stress and panic plus he is scared at time of blood test especially cbc test. So is it possible that due to his mental state increase in hemoglobin and hematocrit can be seen in test results. I mean can persons emotion affect test results temporary.

Yes of course it can. Stress can affect haemoglobin/ haematocrit in both ways. Acute stress can cause temporary elevation of haematocrit value. Again chronic longstanding anxiety can cause reduction of the same. Apart from that; haematocrit can vary due to many reasons i.e environmental temparature, day night cycle, food intake etc. So it is better to repeat the test to confirm the presense of any other pathology.  

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