Group B streptococcus screen
What this test measures
Group B streptococcus is a common bacterium carried in the vagina and bowel by around one woman in four. It is harmless to the carrier but matters around birth.
Why doctors request it
Not routinely screened in the UK, but found on swabs taken for other reasons in pregnancy, or requested privately.
What commonly pushes it up
- Carrying the bacterium, which is common and often comes and goes
What commonly pushes it down
- A negative result is the usual finding
Everyday reasons for a value outside the range
- Low-level positives occur in the general population and are read with the clinical picture
- Thresholds differ between laboratories
About the sample
No fasting needed.
Upload a photo or PDF and see every line against the range your lab printed, explained in plain English. First report free.
Read my report freeThis is an educational summary of results you uploaded. It is not medical advice, a diagnosis or a treatment plan, and it does not replace the doctor who requested the test. If you are worried, or a result is marked outside range, discuss it with your doctor. Written and reviewed by a UK consultant physician. Reference ranges vary between laboratories.