無症候性細菌尿：誰を治療する必要がありますか？

最終更新日： 2026年5月18日

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Asymptomatic bacteriuria issue which is commonly the issue more likely in a pregnant woman have driving almost gynecologist annoyed. After they found out this problem the patients are always transferred to Urology office. However, this kind of problem is not more likely to be occurred only for pregnancy women, by the way, we will dive out this problem “Asymptomatic bacteriuria” in every aspect of it.

Asymptomatic bacteriuria combines “Asymptomatic” (no urinary symptoms – no painful urination, no urinary frequency, no suprapubic discomfort) and “Bacteriuria” (bacteria positive in urine culture). In conclusion, it means bacteria colonized in urine without any urinary symptoms. It can occur in both male and female but more commonly in female.

The treatment is challenging – most patients won’t benefit from antibiotic treatment, and treating unnecessarily increases risk of drug-resistant bacteria. However, there are 2 specific conditions which really need antibiotic therapy.

2 特定の 無症候性細菌尿 conditions which need treatment

1. Pregnancy – confirmed reports show asymptomatic bacteriuria significantly increases preterm labor and kidney infection risk.
2. Patients planned for urologic procedure – the procedure may introduce minor mucosal bleeding leading to symptomatic UTI afterward.

For cases that don’t need treatment, regular follow-up with simple urine examination is recommended. If positive inflammation cells are found, urine culture is performed again.

Asymptomatic bacteriuria is a very sensitive issue which needs good doctor-patient relationship to maximize treatment outcomes. You can visit my official homepage ここ.

お客様からよくいただくご質問

Q1: What is asymptomatic bacteriuria?

Asymptomatic bacteriuria is a condition where bacteria are present in the urine (confirmed by urine culture) but the person has no symptoms of urinary tract infection such as pain during urination, urinary frequency, or suprapubic discomfort. It is more common in women and can occur at any age. The key distinction from a typical UTI is the complete absence of symptoms despite bacterial colonization.

Q2: Does asymptomatic bacteriuria always need antibiotic treatment?

No. For most people, treating asymptomatic bacteriuria with antibiotics provides no benefit and may increase the risk of antibiotic-resistant bacteria. Treatment is only recommended in two specific situations: pregnant women (where it significantly increases preterm labor and kidney infection risk) and patients scheduled to undergo urological procedures (where bacteria in the urine can lead to serious post-procedure infections).

Q3: Why is asymptomatic bacteriuria dangerous in pregnancy?

In pregnant women, asymptomatic bacteriuria carries a significantly higher risk of progressing to symptomatic kidney infection (pyelonephritis) and is associated with increased rates of preterm labor and low birth weight. This is why routine urine culture screening for asymptomatic bacteriuria is recommended at the first antenatal visit, and treatment with appropriate antibiotics is given if confirmed.

Q4: How is asymptomatic bacteriuria diagnosed?

Asymptomatic bacteriuria is diagnosed when a urine culture shows significant bacterial growth (typically more than 100,000 colony-forming units per mL) in a person with no urinary symptoms. A simple urine dipstick test is not sufficient for diagnosis – a formal urine culture is required. If the urine examination shows positive inflammation cells (pyuria), a urine culture should be performed to confirm.

Q5: What happens if asymptomatic bacteriuria is left untreated in non-pregnant women?

In most non-pregnant, otherwise healthy women, asymptomatic bacteriuria does not progress to symptomatic UTI or cause kidney damage, and treatment is not recommended. The bacteria often clear spontaneously over time. Regular monitoring with urine examination is the appropriate approach. However, if symptoms develop or if the person is about to undergo a urological procedure, reassessment and possible treatment should be discussed with a urologist.

If you have been diagnosed with asymptomatic bacteriuria and are unsure whether treatment is needed, Dr. Soarawee Weerasopone offers specialist consultations at Bangkok Hospital Headquarters. 診療をご予約.

**免責事項:** このコンテンツは、バンコク病院本部の認定泌尿器科医であるSoarawee Weerasopone博士によって作成およびレビューされました。教育目的のみのものであり、医学的アドバイスを構成するものではありません。いかなる医療処置を開始する前にも、必ず資格のある医療専門家にご相談ください。.