Thick blood films and concentration technique if films are negative. Blood samples for concentration should be examined on the day of collection.
- unstained thick/thin films
- EDTA blood sample
Key factors affecting tests: Trypanosomes may not survive for more than a few hours in EDTA tube therefore posted samples could show false-negative results. PHONE LAB FOR ADVICE BEFORE SENDING SPECIMEN.
If a CSF sample is to be examined for trypanosomes it should ideally be examined within 20 minutes of L.P.