A. Write in detail, special specimen collection procedures including [a] transportation temperatures, [b] transport media and [c] preservation for the culture of: 1. Urine (5marks) 2. Sputum (5marks) 3. Cerebrospinal fluid (CSF)(5marks)

Here are the special specimen collection procedures for culture:

1. Urine

   • Transportation Temperature: Urine specimens should be transported at $2-8^\circ\text{C}$ (refrigerated) if processing is delayed beyond 2 hours.
   • Transport Media: For delays up to 24 hours, a urine transport tube containing boric acid can be used. Otherwise, a sterile, leak-proof container is sufficient if processed promptly.
   • Preservation for Culture: Refrigeration at $2-8^\circ\text{C}$ for up to 24 hours helps prevent overgrowth of commensal bacteria and preserves pathogens.

2. Sputum

   • Transportation Temperature: Sputum should be transported at room temperature ($20-25^\circ\text{C}$) if processed within 1-2 hours. If a delay is anticipated, refrigerate at $2-8^\circ\text{C}$.
   • Transport Media: No specific transport media is typically required for routine bacterial culture if collected in a sterile, leak-proof container and processed promptly.
   • Preservation for Culture: Refrigeration at $2-8^\circ\text{C}$ for up to 24 hours is recommended to maintain the viability of pathogens and inhibit overgrowth of oral flora.

3. Cerebrospinal Fluid (CSF)

   • Transportation Temperature: CSF specimens are critical and must be transported immediately at room temperature ($20-25^\circ\text{C}$). Refrigeration is contraindicated as it can kill fastidious organisms like Neisseria meningitidis and Haemophilus influenzae.
   • Transport Media: No transport media is used for CSF. It is collected in sterile tubes and must be processed without delay.
   • Preservation for Culture: The best preservation for CSF is immediate processing. If a very short delay is unavoidable, keep the specimen at room temperature. For enhanced recovery, especially if processing is delayed, some laboratories inoculate CSF directly into a blood culture bottle.