When you’re feeling unwell or need peace of mind fast, you don’t want to wait days for results. At Express Urgent Care in Diamond Bar, CA, we provide same-day testing and diagnosis for some of the most common and contagious conditions—strep throat, mononucleosis (mono), pregnancy, RSV, and influenza (flu). Our goal is to help you get answers quickly so you can start the right treatment and get back to feeling your best.
Fast, Accurate Testing When You Need It Most
Whether you’re dealing with a sore throat, fatigue, cough, or just uncertainty, Express Urgent Care offers comprehensive onsite testing. Our experienced medical providers use state-of-the-art equipment and evidence-based protocols to ensure reliable results—often within minutes.
Common Tests We Offer
Strep Test
If you have a sudden sore throat, fever, or swollen glands, you may have strep throat, a bacterial infection that requires antibiotics.
- Rapid strep test: Provides results in 10–15 minutes.
- Throat culture: Used if further confirmation is needed.
Prompt diagnosis and treatment can prevent complications and help you recover faster.
Mono Test
Mononucleosis (often called “the kissing disease”) is caused by the Epstein-Barr virus and can cause fatigue, sore throat, and swollen lymph nodes.
- A simple blood test can confirm mono within minutes.
- Early diagnosis helps you manage symptoms and avoid spreading it to others.
Pregnancy Test
Whether you need to confirm a pregnancy or rule one out, we offer confidential urine-based pregnancy tests with fast, accurate results.
- Over 99% accurate when taken at the right time.
- Professional guidance is available to discuss next steps and care options.
RSV Test
Respiratory Syncytial Virus (RSV) can cause cold-like symptoms in adults but may be more serious for infants, older adults, and those with weakened immune systems.
- We use nasal swab rapid tests to detect RSV quickly.
- Results are typically available the same day.
Flu Test
Flu symptoms—fever, chills, and body aches—can mimic other respiratory infections.
- A nasal or throat swab identifies influenza A or B viruses.
- Quick testing ensures you receive antiviral treatment early for best results.
Why Choose Express Urgent Care?
At Express Urgent Care, we combine convenience, accuracy, and compassion:
- Walk-ins welcome – no appointment needed.
- Same-day results for most tests.
- Onsite lab testing for faster turnaround.
- Board-certified medical providers who take the time to explain your results and treatment options.
Whether you’re managing flu season, feeling unwell, or need an urgent test before returning to school or work, we’re here to help.
Frequently Asked Questions (Q&A)
Q: Do I need an appointment for testing?
A: No appointment is required! Walk in anytime during business hours for fast testing and care.
Q: How long does it take to get results?
A: Most rapid tests—including strep, flu, RSV, and pregnancy—provide results within 15 to 30 minutes. Mono tests and confirmatory lab work may take slightly longer.
Q: Can I get tested for multiple conditions during one visit?
A: Yes. If your symptoms overlap (such as fever and sore throat), our providers may recommend testing for multiple illnesses to ensure an accurate diagnosis.
Q: Is testing covered by insurance?
A: Most insurance plans cover these diagnostic tests. We also offer affordable self-pay options for patients without insurance.
Q: What happens if I test positive?
A: Our providers will discuss treatment options immediately. In many cases, prescriptions can be filled right after your visit so you can begin recovery without delay.
Q: Can children be tested?
A: Absolutely. We offer pediatric testing and gentle care for children of all ages.
Q: Do you offer COVID-19 testing as well?
A: Yes. We provide PCR and rapid COVID-19 testing onsite for complete respiratory evaluation.
Same-Day Results. Same-Day Relief.
Illnesses like strep, mono, RSV, and flu can appear suddenly—but with Express Urgent Care, so can your results. Our team makes it simple to get tested, diagnosed, and treated all in one visit.
Contact Express Urgent Care
Express Urgent Care
📍 750 N Diamond Bar Blvd Suite 102
Diamond Bar, CA 91765
📞 Phone: (909) 718-2455
🌐 https://expressurgentcareinc.com/
Walk in today for fast, accurate testing and compassionate care—no appointment needed.