All you need to know about testing p24 Antigen levels with a laboratory test
p24 antigen is a structural protein that makes up most of the HIV viral core.
High levels of p24 are present in the blood serum of newly infected individuals, making p24 antigen assays useful in diagnosing primary HIV infection.
By buying a laboratory test kit with professional nurse or clinic collection, you can accurately measure p24 Antigen for total reassurance.
Professional analysis in an accredited laboratory ensures rapid result delivery.
The Vitall HIV 1 & 2 nurse or clinic test kit includes a p24 Antigen test and is available for just £59.00.
Tests which include a p24 Antigen test:
A positive p24 antigen test does not provide the complete picture. Interpretation can be affected by the time since infection, and p24 can become negative after a certain period even when an infection is present.
A positive p24 result is commonly looked at alongside other HIV-related results to build a clearer overall picture, including HIV antigen and antibody testing, as well as viral load and CD4 count.
When the risk of infection is considered high, this finding is often prioritised for further review and evaluation, sometimes through a GP or a local sexual health clinic.
As mentioned above, a negative test does not rule out HIV infection, as results can be affected by the timing of HIV exposure and the timing of testing.
Where suspicion of HIV infection is high or exposure is significant, p24 alone is not always enough to clarify HIV status. This result is often considered alongside other information and may be reviewed further to interpret it in context.
Measure your p24 Antigen levels and this 4th generation hiv test detects hiv with 99.80% clinical specificity with a HIV 1 & 2 nurse or clinic finger-prick bloodtest kit
You get the convenient testing with the reassurance of professional clinical analysis. Your results are delivered quickly & securely online.
This HIV 1 & 2 Test is advised if you:
Dr. Shahzaib Ahmad MBBS, BSc, MRCP, FRCA, FFICM
Clinical Supervisor - Vitall|GMC 7495062|Profile
Reviewed on 03/02/2026
Next review due 03/02/2027
Review focus: Blood biomarkers, laboratory testing methodology, and biochemical interpretation.
Powered by
All Testing Is Conducted In UKAS Accredited Laboratories.
© 2026 Healthy Human Labs LTD, 71 - 75 Shelton Street, Covent Garden, London, WC2H 9JQ.
Company number: 1126 3709
HIV 1 & 2