Dictionary trouble

[volcano63]

Your vars is essentially a mapper from full name to possible acronym form(s). Since there are 2 forms at most, and the only difference is a dot at the end, I would suggest reversed mapper with dot-less keys only

Output:
In [143]: acro_2_name = {value: key for key, values in vars.items() 
     ...:                           for value in values if not value.endswith('.')}

In [140]: acro_2_name
Out[140]: 
{'HGB': 'Hemoglobin',
 'RBC COUNT': 'RBC count',
 'HCT': 'HCT',
 'MCV': 'MCV',
 'MCH': 'MCH',
 'MCHC': 'MCHC',
 'WBC COUNT': 'WBC count',
 'NEUTROPHIL': 'Neutrophils',
 'EOSINOPHIL': 'Eosinophils',
 'BASOPHIL': 'Basophils',
 'LYMPHOCYTE': 'Lymphocytes',
 'MONOCYTE': 'Monocytes',
 'AEC': 'AEC',
 'PLATELET': 'Platelets'}

When converting results, just remove possible trailing dot - and you are good to go

Output:
In [141]: {acro_2_name[result_acro.rstrip('.')]: value for result_acro, value in d2.items()}
Out[141]: 
{'Basophils': '0.5',
 'Eosinophils': '1.1',
 'HCT': '32.3',
 'Hemoglobin': '10.0',
 'Lymphocytes': '16.3',
 'MCH': '30.3',
 'MCHC': '31.0',
 'MCV': '97.9',
 'Monocytes': '4.9',
 'Neutrophils': '77.2',
 'Platelets': '606',
 'RBC count': '3.30',
 'WBC count': '9.41'}

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PS I would suggest to moderate spaces in your code to PEP-8 recommended. Too many spaces/empty lines bloat the code and reduce readability.