STI Blood Screen
Private STI Blood Screen in London for £175, checking four important blood-borne infections with confidential results in around 2–3 days.
Turnaround time
2-3 business days
Biomarkers count
4
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Overview of the STI Blood Screen
The STI Blood Screen is a private sexual-health blood test checking for four important infections that can be transmitted through sexual contact or blood exposure.
The test contains 4 biomarkers: Hep B Surface Antigen, Hepatitis C Antibody, HIV I & II Ab/ p24 Ag screen and Syphilis Antibodies IgG/IgM.
Unlike urine and swab STI tests, which are primarily used to detect infections such as Chlamydia and Gonorrhoea, this profile focuses on infections for which serology and antigen testing from blood are clinically appropriate.
The HIV component combines antibodies to HIV-1 and HIV-2 with detection of the p24 antigen. This fourth-generation approach can identify infection earlier than antibody-only testing because p24 may become detectable before the antibody response is fully established.
The Hepatitis B Surface Antigen test looks for HBsAg, a marker associated with current Hepatitis B infection. It does not determine immunity; Hepatitis B Surface Antibody testing is used for that purpose.
The Hepatitis C Antibody test identifies whether the immune system has been exposed to Hepatitis C. A reactive antibody result does not by itself confirm that active infection is still present because antibodies can remain after previous infection or successful treatment. Hepatitis C RNA testing is used to establish active viraemia.
Syphilis IgG/IgM antibodies are used as part of serological screening for infection with Treponema pallidum.
The timing of testing following exposure is important because all infection tests have a window period. Testing too soon can produce a negative result before the relevant antigen or antibodies are detectable.
A negative test therefore needs to be interpreted in relation to when the potential exposure occurred.
What Does the STI Blood Screen Check?
This test measures 4 biomarkers.
Hep B Surface Antigen
Detects Hepatitis B Surface Antigen, a marker associated with current Hepatitis B infection. It does not measure immunity to Hepatitis B.
Hepatitis C Antibody
Detects antibodies produced following exposure to Hepatitis C virus. A reactive result normally requires further testing to determine whether active infection is present.
HIV I & II Ab/ p24 Ag screen
Uses fourth-generation screening to detect antibodies to HIV-1 and HIV-2 together with HIV p24 antigen, improving detection during earlier infection compared with antibody-only testing.
Syphilis Antibodies IgG/IgM
Detects antibodies associated with infection by Treponema pallidum, the bacterium responsible for Syphilis.
Who May Benefit From the STI Blood Screen?
This profile may be suitable for people seeking confidential screening for HIV, Hepatitis B, Hepatitis C and Syphilis following potential exposure or as part of routine sexual-health monitoring.
People following unprotected sexual contact - Blood-borne and sexually transmitted infections can occur even when the other person has no symptoms.
People with a new sexual partner - Screening can provide useful information before or during a new relationship.
People with multiple sexual partners - Regular screening may be appropriate depending on individual exposure risk.
People whose partner has received a positive STI result - Testing should be selected according to the infection involved and the timing of exposure.
People following blood or needle exposure - HIV and viral hepatitis testing may be required after certain blood exposures.
People seeking routine confidential sexual-health screening - Many infections can remain clinically silent.
People preparing for fertility treatment or pregnancy - Screening for selected infections may be required as part of reproductive care.
People with a previous STI who have had a new exposure - Previous infection does not protect against many future infections.
People specifically advised to have blood-borne STI screening - This profile combines four important laboratory tests from one venous sample.
How to Prepare
There is no need to deliberately delay testing if you are concerned following an exposure, but an early negative result may need repeating after the relevant window period.
A healthcare professional can advise whether additional molecular testing or repeat serology is appropriate.
Symptoms and Reasons to Consider the STI Blood Screen
Many of the infections included in this profile can be completely asymptomatic, particularly during their early stages.
Flu-like illness following a relevant exposure - Acute HIV and some viral hepatitis infections can initially resemble a non-specific viral illness.
Unexplained swollen lymph nodes - Lymph-node enlargement can occur with several infections, including HIV and Syphilis.
A new unexplained rash - Secondary Syphilis can cause a widespread rash, although many other conditions can do the same.
A painless genital ulcer - Primary Syphilis can present with a chancre that may resolve without treatment.
Persistent unexplained fatigue - Viral hepatitis and HIV can cause fatigue, although it is highly non-specific.
Yellowing of the skin or eyes - Hepatitis can cause jaundice when significant liver inflammation is present.
Dark urine with other liver-related symptoms - This can occur during acute viral hepatitis.
No symptoms after unprotected sexual contact - Absence of symptoms does not reliably exclude any of these infections.
A partner diagnosed with HIV, Hepatitis B, Hepatitis C or Syphilis - Specific testing and clinical advice are important after a known exposure.
Symptoms cannot determine whether one of these infections is present, and testing during the window period may need to be repeated.
If a high-risk HIV exposure occurred very recently, seek urgent sexual-health advice because HIV post-exposure prophylaxis is time-sensitive and should be started as soon as possible when indicated.
How to Book Your STI Blood Screen
Booking your private STI Blood Screen with London Blood Tests is straightforward.
Choose the STI Blood Screen
Select the four-marker STI Blood Screen for HIV, Hepatitis B, Hepatitis C and Syphilis.
Select your sample collection option
Choose an in-clinic blood draw or professional home or hotel phlebotomy depending on availability.
Attend your appointment
A trained healthcare professional collects the required venous blood sample confidentially.
Laboratory analysis
Your sample is analysed for the four antigen and antibody markers included in the profile.
Receive your results securely
Your authorised STI report is delivered securely with appropriate follow-up advised for reactive findings.
When Will I Receive My Results?
The current expected turnaround for the STI Blood Screen is approximately 2–3 business days after your sample reaches the laboratory.
The individual HIV, Hepatitis and Syphilis assays must be analysed and pass laboratory quality-control and authorisation procedures before your report is released.
Turnaround starts from laboratory receipt rather than necessarily from the exact time your blood is collected.
If a screening test is reactive, additional confirmatory investigation may be required. Confirmatory testing can extend the overall reporting period because an initial reactive screen is not always the final diagnostic result.
Understanding Your Results
A negative result means the relevant antigen or antibodies were not detected at the time of testing.
If sufficient time has passed since exposure, this is reassuring.
If testing occurred during a window period, repeat testing may still be appropriate.
A reactive HIV fourth-generation screen requires confirmatory laboratory testing before HIV infection is diagnosed.
A positive Hepatitis B Surface Antigen result suggests current Hepatitis B infection and usually requires a wider Hepatitis B profile and clinical assessment.
A reactive Hepatitis C Antibody result demonstrates exposure but does not establish active infection. Hepatitis C RNA testing is required to determine whether the virus remains present.
Reactive Syphilis antibodies require interpretation with confirmatory serology, previous treatment history and clinical circumstances.
One abnormal screening result should therefore not be interpreted without the appropriate confirmatory pathway.
Why Book With London Blood Tests?
Private STI testing in London - Access confidential sexual-health blood screening.
Four important infections assessed together - HIV, Hepatitis B, Hepatitis C and Syphilis are included.
Fourth-generation HIV screening - HIV antibodies and p24 antigen are assessed together.
Suitable for asymptomatic screening - These infections can remain clinically silent.
Clinic and home collection options - Professional venous blood collection can be arranged.
Secure confidential reporting - Results are delivered privately.
Clear follow-up pathway - Reactive screening results can be followed by appropriate confirmatory investigation.
Clear pricing - The STI Blood Screen costs £175.
Private STI Blood Screen in London
London Blood Tests provides private STI Blood Screen testing in London for people seeking confidential screening for HIV, Hepatitis B, Hepatitis C and Syphilis.
The test costs £175 and contains 4 biomarkers.
Results are expected approximately 2–3 business days after laboratory receipt.
The timing of the test after exposure should always be considered when interpreting a negative result.