The diagnosis of B-CLL is established by the following  
criteria:  
Sustained increase of peripheral blood lymphocytes  
>5*10^9cells/l not explained by other clinical  
disorders.  
Predominance of small, morphologically mature  
lymphocytes in the blood smear.  
Immunophenotyping: The composite immunophenotype  
CD5 + , CD23 + , CD20 dim + , sIg dim + ,  
FMC- allows one to distinguish most cases of  
B-CLL from other CD5 + B-cell lymphoma. The  
Matutes score may be helpful in this regard.  
Lymph node biopsy: Histological confirmation is  
recommended whenever an enlarged, accessible, peripheral  
lymph node allows the procedure without  
additional risk.  
The following additional examinations are recommended  
for the initial evaluation [V, D]:  
Physical examination including a careful palpation  
of all lymph node areas.  
LDH, b2-microglobulin, bilirubin, serum–protein  
electrophoresis, Coombs test.  
Chest X-ray, abdominal ultrasound or computer  
tomography.  
 
(http://annonc.oxfordjournals.org/cgi/reprint/16/suppl_1/i50)  

A patient with this degree of absolute lymphocytosis can probably be diagnosed as "compatible with CLL". This of course, only if the lymphocytosis is persistent and there is not an other possible cause (e.g. significant "isolated" lymphadenopathy and/or splenomegaly). Advanced Rai stages must be confirmed by immunophenotyping. I found hard to believe however, that the lymph nodes are not at least slightly "palpable".  
 
A few observations: from your pics one does not get the feeling for how many smudge cells (see pics 7 to 10) there are on the PB smear as well as the overall amount of the lymphocytosis. The cytologic characteristic of the cells depictes seem to be compatible with CLL (with the caveat that fig. 3 shows a slight nuclear notch-- not unusual, just not so typical). One has to see many more cells to pass a overall judgment.  
 
My practical advice: in the absence of further "technology" to bear on the case, I would recommend --as a minimum-- bone marrow aspirate and biopsy to confirm a CLL picture. If flow is available, PB findings plus flow would then suffice.

Cytology looks like CLL, though nuclear irregularities are rather pronounced.  
 
By the way, Rai 0 patients must have neither anaemia nor thrombocytopenia. If CT is not available, at least abdominal ultrasound and thorax Rtg should be done, there could be surprises. And I second the opinion that usually with such blood count there are peripheral lymph nodes, smallish but involved and thus histologically informative.

A 61 yrs old man with an isolated lymphocytosis (we assume that hemoglobin and platelet count are normal) without splenomegaly nor lymphadenopathy. Cytology shows monomorphic small lymphocytes; I agree with phatale69 to only say "chronic lymphoproliferative disease" before immunophenotyping. If immunophenotyping confirm the CLL diagnosis I will say CLL even for a stage 0.  
I think that "absolute lymphocytosis" is not a diagnosis because there is no notion of malignancy or of chronicity. We must follow recommandations of the international classifications as closely as possible and the clinicians have to perform the staging. Diagnosis terminology is not to be modified by the staging and treatment options.

Thanks everyone. HB & platelet count were normal & USG sonography-NAD-normal size spleen.