Trust Homepage > Pathology Homepage

Test and Tubes Database
ID:583 Alcohol and acid fast bacilli (AAFB) culture - General Information
Search Links: General Info : Protocols : Patient Info

Description85% of clinical tuberculosis cases present as pulmonary tuberculosis. Extrapulmonary tuberculosis can affect all organs with miliary tuberculosis and tuberculous meningitis being very serious disease presentations. Tuberculous lymphadenitis, abdominal tuberculosis, "cold" abscesses and skeletal tuberculosis are other sites. Latent tuberculosis denotes a condition when patients are infected with tuberculosis but show no clinical symptoms. Latently infected patients are not infectious to others but carry a 10% lifetime risk of developing active i.e. clinical TB with the highest risk of developing active disease within 2 years after becoming latently infected. Tuberculin skin testing (Mantoux testing) is the current diagnostic standard but gamma-interferon testing (Quantiferon-Gold)offers an alternative for selected patients.
Additional InfoAuramine staining of tissue samples is carried out within 24-48 hrs after receipt of samples but microscopy is less sensitive than culture. In selected patients TB PCR can be of value but this has to be discussed with a microbiologist prior to testing.
Concurrent Testsna
Dietary Requirementsna

InterpretationPreliminary microscopy results will be reported negative or positive with a quantitative indication. Initial culture results will be reported as AAFB isolated with confirmation of final identification and sensitivities reported later

Ref. Range (Male)
Ref. Range (Female)
Ref. Range (Paed)
Ref. Range Notes
Units - Not Defined -

IP Acute TAT60 days
IP Routine TAT60 days
GP Acute TAT60 days
GP Routine TAT60 days
Turnround CommentMicroscopy for AAFB will be available within 24 hours for samples received Monday to Friday before 12pm. Microscopy TAT for samples received at weekends and bank holidays will be 3 days. Culture 60 days Turnaround time may be increased if prolonged incubation is clinically indicated.
Originally edited by : Dr. H. Schuster. Last edited on 30/11/2018 12:24:26. Published By K Roberts on 30/11/2017 12:24:26.