Rizwan Iqbal, Iffat Shabbir, Tariq Waseem.
Screening of AFB in sputum by concentration or direct smear method.
Pak J Med Res Jan ;39(1):35-6.
A comparative study of 800 sputum cases was carried out to establish the efficiency of direct and concentration method for the detection of AFB. A total of 22.1% sputum specimens were found AFB positive by concentration method and 14.1% by direct method. Positive smears were missed by both methods, but more by direct method. Percentage of agreement between two methods were 89.6% and dis-agreement was 10.4%. It is concluded that positive yield is more by concentration method.
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