Abnormal blood work: mean corpuscular hemoglobin  elevated 33.9, neutrophils decreased, 10.7, lymphocytes decreased, 12.7, and absolute neutrophils elevated 7.97, after first vaccine; Abnormal blood work: mean corpuscular hemoglobin  elevated 33.9, neutrophils decreased, 10.7, lymphocytes decreased, 12.7, and absolute neutrophils elevated 7.97, after first vaccine; Abnormal blood work: mean corpuscular hemoglobin  elevated 33.9, neutrophils decreased, 10.7, lymphocytes decreased, 12.7, and absolute neutrophils elevated 7.97, after first vaccine; Abnormal blood work: mean corpuscular hemoglobin  elevated 33.9, neutrophils decreased, 10.7, lymphocytes decreased, 12.7, and absolute neutrophils elevated 7.97, after first vaccine; This is a spontaneous report from a contactable consumer (patient's sister). A 61-years-old male patient received the first dose of bnt162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE; Lot Number: UNKNOWN), via an unspecified route of administration, administered in left arm on 13May2021 11:30 (at the age of 61-years-old) as a single dose for covid-19 immunization at a clinic inside a hospital. Medical history included schizophrenia (diagnosed at the age of 17), acid reflux, enlarged prostate all ongoing and prostatomegaly: prostatic operation on Aug2020. Concomitant medications included clozapine (CLOZAPINE, for over 30 years, started in 1990s) taken for schizophrenia; tamsulosin hydrochloride (TAMSULOSIN HCL, about 2 years ago) 0.8 mg once a day taken for prostatomegaly, acetylsalicylic acid (BABY ASPIRIN, about 4 years ago);81mg once a day orally and omeprazole (OMEPRAZOLE, about 10 years ago); 40 mg once day oral all ongoing. The patient had no history of immunization, no other vaccine on same date of suspect. The patient had no other vaccine within four weeks and had no AE prior vaccination. Caller states her brother got the vaccine about 8 days ago. Caller states her brother has to get a blood test every month. Caller states he went for a blood test two days ago, and the results of his bloodwork are a little abnormal. Caller states that after the vaccine, his mean corpuscular hemoglobin, neutrophils, lymphocytes and absolute neutrophils were not in normal range. Caller states that these functions were normal, previous to his vaccine. caller states she does not know of any, and her health issues are not related to her brother's. Caller states sometimes her brother has abnormal bloodwork because he can be anemic, such as his red blood cells, hemoglobin, hematocrit and red cell distribution width, can be abnormal at times. Caller notes the day that she looked up her brother's results. Caller states it was the same day that he had the blood drawn and she got the results. Caller states it was late at night when she got the results. On 19May2021, the lab result of patient revealed abnormal blood work: mean corpuscular hemoglobin elevated 33.9, neutrophils decreased, 10.7, lymphocytes decreased, 12.7, and absolute neutrophils elevated 7.97, after first vaccine. Mean corpuscular hemoglobin was elevated: 33.9, normal range 25.0 to 33.0 pg. Neutrophils, decreased: 10.7, normal range 11.5 to 15.0%. Lymphocytes, decreased: 12.7, normal range 20.0 to 45.0%. Absolute neutrophils elevated: 7.97, normal range 1.50 to 7.50 k/ul. The patient underwent lab tests and procedures which included on 19May2021 lymphocyte count: 12.7 % decreased, mean cell haemoglobin: 33.9 on 19May2021 elevated, neutrophil count: 7.97 elevated, neutrophil count: 10.7 % decreased. Caller has a concern if her brother should get the second dose of vaccine. Outcome of the event was unknown.  Information on lot/Batch number has been requested.