Turnaround times
The quoted turnaround time is from sample receipt in the laboratory, to results authorisation in the Laboratory Information Management system. The times do not include transport of specimen to the laboratory or the administrative process to print and post/email reports. Service users must allow for transport and reporting time when ordering tests.
Clinical background:
Screening test for HIV infection (4th generation assay). A positive test must be confirmed by other tests before definitive diagnosis can be made. The test may be positive 2-4 weeks after infection. However to fully exclude recent infection a repeat sample should be sent at least 3 months after suspected exposure.
Specimen container paediatric:
Clotted blood.
Specimen container adult:
Clotted blood – Gold SST.
Minimum volume paediatric:
1ml
Minimum volume adult:
5ml
Special requirements:
Send to laboratory as quickly as possible. If delays likely, refrigerate at 2-8 deg C.
Sample stability:
Stable for up to 24 hrs.
Transport requirements:
Standard
Add on test:
Possible up to 5 days.
Quality assurance:
UK National External Quality Assurance Scheme (UKNEQAS).
Interpretation:
May be negative for up to 3 months following infection (window period).
Reference ranges:
None available
Factors affecting result:
If delays likely, refrigerate at 2-8 deg C.
Referenced Documents:
Standards of Microbiology Investigations (UK SMI V11)
Other info:
N/A