What's this test for?

This test is ideal if you're currently being treated with the antibiotic tobramycin for a serious bacterial infection and need to make sure the drug is staying at a safe, effective level in your blood. It helps check that the medication hasn't built up too much between doses, which can protect your kidneys and hearing from potential damage. It's typically used for people on ongoing tobramycin therapy who need regular level checks.

What happens after I get my results?

Your results will show up in your account with the trough level for tobramycin along with the normal reference range so you can see exactly where you fall. If your level is within the safe range, no action may be needed other than continuing your current dosing schedule, but if it's too high or too low, retesting or a dosage adjustment may be needed soon. A downloadable lab report is available in your account for your records, and you can use the trends feature to track your levels over time if you're tested more than once. If a result comes back significantly outside the safe range, especially on the high side, seek medical care right away since this can signal a risk to your kidneys or hearing.

Who should consider this test?

Anyone currently receiving tobramycin therapy for a serious infection, especially infections caused by bacteria like Pseudomonas, Proteus, or Klebsiella, should consider this test. People on longer courses of tobramycin, those with existing kidney concerns, or anyone whose dose was recently changed benefit most from regular trough monitoring. It's especially important if you're managing treatment at home or outside a hospital setting.

What symptoms indicate I may need this test?

If you're on tobramycin and start noticing ringing in your ears, dizziness, hearing changes, decreased urination, swelling, or unusual fatigue, a trough level check can help figure out if the drug has built up too high in your system. These symptoms can be early warning signs of kidney or hearing-related side effects. Catching this early through testing can help prevent more serious complications.

When will I get my results?

Results are typically available within about 7 days of your blood draw. Because tobramycin levels can change quickly, it's important to get your blood drawn at the specific time your treatment plan calls for (usually right before your next dose) so the trough reading is accurate.

What does high tobramycin mean?

A high trough level means the drug hasn't fully cleared from your system before your next dose, which raises the risk of kidney damage and hearing problems. This is often caused by a dose that's too high, dosing too frequently, or reduced kidney function that slows how fast your body clears the drug. Staying well hydrated and reporting any hearing or urination changes right away can help, but a high result usually means your dosing schedule needs to be reviewed soon.

What does low tobramycin mean?

A low trough level suggests the drug is clearing out of your system too quickly, which could mean the medication isn't strong enough to fully fight off the infection between doses. This can happen if the dose is too low, doses are spaced too far apart, or your body is processing the drug faster than expected. If your level comes back low, it may be worth retesting or adjusting the timing of your next dose.

What causes high or low tobramycin levels?

Levels can shift based on your kidney function, how well you're staying hydrated, your body weight, and the exact timing of your dose relative to your blood draw. Missing the precise trough timing (right before the next dose) is one of the most common reasons for an inaccurate reading. Other medications you're taking can also affect how quickly tobramycin is cleared from your body.

How often should I retest?

Retesting frequency depends on your treatment length and any dose changes, but many people on tobramycin get checked every few days during the early part of treatment. If your levels have been stable within a safe range, testing may become less frequent, but any change in dose or kidney function is a good reason to retest sooner. Follow the schedule outlined in your treatment plan for best results.

What should I do if my results are abnormal?

If your trough level is outside the safe range, don't change your dose or stop your medication on your own. Instead, retest as recommended and keep track of any new symptoms like hearing changes, dizziness, or reduced urination. If your result is significantly high or you notice concerning symptoms, seek medical care promptly since this can indicate a safety issue.

Getting your blood test with us is easy, private & backed by the power of science.Long story short: In the test options, use the filters or search box to narrow your choices and find the test you want. If you need a hand navigating through options, text our super friendly support team at 754-799-7833, and we'll provide tailored suggestions to help you find the ideal test. Once your order is placed, we’ll create your doctor’s lab order remotely, without any need for you to make a trip to a doctor in person or to talk to the doctor. Expect to receive your doctor’s lab order right in your inbox. It will also be in your patient portal if you need to find it later. We’ll also include instructions regarding fasting and other requirements for your test. Your patient portal will be auto-created hassle-free during checkout. If this is your first time ordering, you'll be prompted to create a password for instant login access to your patient portal. It's a quick way to conveniently access your orders and results whenever you want. When you’re ready, visit one of our 4,000 locations. Just bring your ID – no printing or faxing of your lab order is needed, as your order and details will already be in the lab system. Note that most lab locations don’t accept walk-ins, so it’s best to book an appointment in advance. Don’t worry – we’ll provide detailed instructions along the way. You’ll get your results via email & SMS and dive into understanding your body better. Yup, that easy! If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com and we'll gladly help you.

How do I know which test to get?

In the test options, find the test you want. If you’re not sure which test to get, we can lend a hand in finding the right option. Just text or call us at 754-799-7833, email us at support@privatemdlabs.com, and we'll gladly help you. We've got your back and reply quickly.

When will my lab results be available?

Most test results will be available within 1–3 business days. Once they're ready, we'll send an email and text message to let you know. After your blood draw, just hang tight and don't worry – we'll keep you updated and in the loop! If you have any further questions, please text us at 754-799-7833 or email support@privatemdlabs.com, and we'll gladly help you.

Is it possible to make changes to my lab order if I made a mistake with the name, date of birth, or any other details?

Absolutely! We totally understand that errors can happen. No worries, we're here to help you. Just reach out to us via text at 754-799-7833 or shoot us an email at support@privatemdlabs.com. Remember to include your order number and let us know the correct information you’d like to update. Our awesome team will jump right in and make sure everything is sorted out and accurate for you. There are no changes necessary if your address is wrong on the requisition though. We don’t mail anything out. Our lab requires an address to be listed to generate an order.

Do you accept health insurance?

Only HSA & FSA is accepted. Our services are strictly self-pay and cannot be submitted to your health insurance provider except for Health Savings Accounts or Flexible Savings Accounts. This policy applies to all insurance companies, including federal health insurance programs like Medicare. If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com.

Can I cancel my order?

Yes. We get it – sometimes your needs change. As long as your samples haven’t been collected yet, we’re happy to help you cancel your order. If you have any further questions, please text us at 754-799-7833 or email support@privatemdlabs.com. You can read more about our cancellation policy here.

How can I find a lab location near me?

During the ordering process, you’ll be able to select a specific lab near you, with no strings attached! You can switch it up later easily and visit any of our authorized locations as long as it’s the same lab company you selected your test for (Quest Diagnostics or Labcorp). Before you proceed with your order, feel free to browse through all our lab locations here. This will give you the peace of mind of knowing that there's a lab nearby your home, office or your favorite gym. If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com and we'll gladly help you.

Tobramycin Trough Test - Antibiotic Level Monitoring

Getting your blood test with us is easy, private & backed by the power of science.

Long story short:

In the test options, use the filters or search box to narrow your choices and find the test you want.
If you need a hand navigating through options, text our super friendly support team at 754-799-7833, and we'll provide tailored suggestions to help you find the ideal test.
Once your order is placed, we’ll create your doctor’s lab order remotely, without any need for you to make a trip to a doctor in person or to talk to the doctor. Expect to receive your doctor’s lab order right in your inbox. It will also be in your patient portal if you need to find it later. We’ll also include instructions regarding fasting and other requirements for your test. Your patient portal will be auto-created hassle-free during checkout.
If this is your first time ordering, you'll be prompted to create a password for instant login access to your patient portal. It's a quick way to conveniently access your orders and results whenever you want.
When you’re ready, visit one of our 4,000 locations. Just bring your ID – no printing or faxing of your lab order is needed, as your order and details will already be in the lab system.
Note that most lab locations don’t accept walk-ins, so it’s best to book an appointment in advance. Don’t worry – we’ll provide detailed instructions along the way.
You’ll get your results via email & SMS and dive into understanding your body better. Yup, that easy!

754-799-7833

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