Slide for Acid Fast Bacilli (AFB) microscopic examination:

AFB1804-1: Positive

AFB1804-2: Positive

AFB1804-3: Positive

– Shipped April 16, 2018

Participants’ results

positive5 (Acceptable)3 (Acceptable)5 (Acceptable)
negative 1 (Unacceptable)
negative + comment1 (Ungraded)

comment – “Note slide # 2 had few acid fast bacilli?? our lab would report as negative as need >5/slide


All samples were produced by CMPT. Samples were randomly selected for QC/QA.

Unstained samples were homogeneous and stable for at least to 30 days at 4C.

Sample AFB1804-1 consisted of 3+ (11-50/oif) Mycobacterium chelonae, AFB positive and samples AFB1804-2 & -3 consisted of 2+ (1-10/oif) Mycobacterium chelonae .

All three samples also contained Streptococcus salivarius, AFB negative. Statistical analysis is not applicable.

Posted in AFB Results, critiques