1,25-dihydroxyvitamin D (calcitriol)
This test measures 1,25-dihydroxyvitamin D, the biologically active form of vitamin D. It is used to investigate calcium imbalance, kidney disease and...
This PCR screen detects seven common sexually transmitted infections with high accuracy. It identifies active infections even when symptoms are mild or absent.
Turnaround time
Full results available 2 weeks after arrival in lab. Interim report released initially. Doctor's report sent the day after results available (if required)
Biomarkers count
7
Professional phlebotomist comes to you
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The 7 STI PCR Screen is a molecular test that detects the genetic material of seven common sexually transmitted infections using polymerase chain reaction (PCR) technology. PCR is highly sensitive and specific, allowing accurate identification of active infections even at very low levels.
This test is designed to identify current infections rather than past exposure. It is particularly useful for early detection, asymptomatic screening, and confirming infections when symptoms are unclear or inconsistent.
By testing multiple infections at once, this panel provides a comprehensive overview of sexual health in a single assessment, supporting timely diagnosis and treatment.
You may need this test if you are sexually active and want to screen for infections that may not cause immediate symptoms. Many STIs remain asymptomatic for long periods while still being transmissible and capable of causing long-term complications.
PCR testing is especially important after unprotected sex, a new partner, or if you or your partner have symptoms such as discharge, pain or irritation. Early detection allows prompt treatment, reduces transmission risk and helps prevent complications affecting fertility and general health.
Symptoms and scenarios where testing is recommended:
Testing can be completed at a UK clinic or through professionally supported sample collection, depending on sample type.
You can download and share your results with your GP or sexual health specialist if needed.
Negative Results
Negative PCR results indicate no detectable STI DNA was found.
This suggests no active infection at the time of testing.
Normal / Expected Findings
Expected results confirm absence of the infections tested.
Routine screening may still be recommended depending on risk.
Positive Results
Positive results confirm an active STI.
This indicates current infection and the need for appropriate treatment and follow-up.
Partner testing and treatment may also be advised.
Simple steps to get your results
Choose your test online and book in seconds. Select your preferred clinic location or home visit option.
Attend one of our UK or London clinics, arrange a home nurse visit, or use a finger-prick kit where available.
Your sample is analysed by accredited UK laboratories, with secure results delivered directly to you.
Take control of your health with London Blood Tests
WhatsApp UsFollow these guidelines for accurate results
Where possible, attend your blood test between 7am and 12pm. Please wait until any short-term illness or infection has fully resolved before testing. Avoid intense exercise for 24–48 hours beforehand, as this can affect certain markers.
Fasting is not always required, but some tests may recommend it. If fasting is advised, avoid food for 8–12 hours before your appointment and drink water only. Stay well hydrated, as this helps with sample collection and accuracy.
Continue prescribed medications unless advised otherwise by your clinician. Avoid vitamin, mineral, or biotin supplements for at least 24–48 hours before your test, as these can interfere with results. If you are unsure about any medication or supplement, please let us know before your appointment.
For hormone-related tests, timing within your menstrual cycle may be important. If relevant, follow any specific guidance provided on your test page.
If you have any questions or special circumstances, our team is happy to advise before your appointment.
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