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Transferrin test for people experiencing constant fatigue and unexplained tiredness

Iron Test for Constant Tiredness and Low Energy

Transferrin

Google
3,138 reviews
  • Pinpoint iron deficiency causing your fatigue
  • Reveal hidden anemia affecting your energy
  • Clarify why you feel constantly tired
First results as soon as overnight*

90 day happiness guarantee

We stand behind our service

Prescription & fees included

Go directly to the lab, no extra fees

Easy to understand results

With friendly doctor's notes & guidance

Fast & convenient

Lab visit as quick as 10 mins in & out

90 day happiness guarantee

We stand behind our service

Prescription & fees included

Go directly to the lab, no extra fees

Easy to understand results

With friendly doctor's notes & guidance

Fast & convenient

Lab visit as quick as 10 mins in & out

What's this test for?

This test is ideal if you're experiencing constant fatigue, weakness, or feeling tired all the time despite getting enough sleep. It helps identify iron deficiency or iron overload by measuring transferrin, a protein that carries iron in your blood. Many people use this test when they suspect their exhaustion is related to iron imbalance or nutritional issues but want concrete answers.

How should I prepare for this test?

Fasting: 12 hours

You'll need to fast for at least 12 hours before your blood draw. This means no food or beverages except water during that time. Fasting ensures accurate transferrin measurements since food intake can temporarily affect iron-related biomarkers. Schedule your test for the morning if possible, so you can fast overnight while you sleep.

What's included in this test?

Transferrin

This test measures Transferrin, a key protein that binds to iron and transports it throughout your body. By checking transferrin levels, we can assess your iron balance and nutritional status, which directly impacts your energy, immune function, and overall vitality. This single biomarker provides valuable insight into whether iron deficiency is causing your fatigue or if there are other iron-related concerns affecting your health.

What happens after I get my results?
You'll receive detailed doctor notes in simple language explaining what your transferrin levels mean for your energy and overall health. These notes include personalized recommendations like dietary changes to improve iron absorption, supplement suggestions, or whether you should investigate other causes of fatigue. You'll also get the standard lab report and can track your transferrin levels over time using our trends feature to see how your nutritional interventions are working.
Who should consider getting this test?
This test is valuable for people experiencing persistent fatigue, weakness, or pale skin that might indicate iron deficiency anemia. It's also important for those with chronic inflammatory conditions, liver disease, kidney disease, or cancer that can affect iron metabolism. Anyone concerned about their nutritional status or those being evaluated for unexplained tiredness should consider this test.
What symptoms indicate I may need this test?
Common symptoms include constant tiredness that doesn't improve with rest, weakness, pale or yellowish skin, shortness of breath, dizziness, and cold hands and feet. You might also experience brittle nails, frequent infections, or difficulty concentrating. These symptoms often appear when your body isn't properly transporting iron to where it's needed most.
How can I naturally support healthy iron levels?
Focus on eating iron-rich foods like lean red meat, poultry, fish, beans, lentils, and dark leafy greens like spinach. Pair iron-rich foods with vitamin C sources like citrus fruits or bell peppers to enhance absorption. Avoid drinking tea or coffee with meals as they can inhibit iron absorption. Cooking in cast iron cookware can also add small amounts of iron to your food.
What is transferrin and why does it matter?
Transferrin is a protein made by your liver that acts as iron's transport vehicle in your bloodstream. It picks up iron from your diet and delivers it to cells throughout your body where it's needed for oxygen transport, energy production, and immune function. When transferrin levels are abnormal, it signals that your body's iron balance is off, which can affect everything from your energy to your ability to fight infections.
What does high transferrin mean?
High transferrin levels typically indicate iron deficiency, as your body produces more transferrin to try to capture and transport whatever iron is available. This is your body's way of compensating for low iron stores. It often appears alongside symptoms like fatigue, weakness, and pale skin, and may suggest you need to increase dietary iron or investigate why your body isn't absorbing iron properly.
What does low transferrin mean?
Low transferrin can indicate chronic inflammation, liver disease, malnutrition, or kidney disease. It may also appear in cases of iron overload, where your body reduces transferrin production because there's already too much iron circulating. Low levels can affect your body's ability to properly distribute iron and may contribute to fatigue or other health concerns depending on the underlying cause.
How’s this work?
Getting your blood test with us is easy, private & backed by the power of science.

Long story short:
  1. In the test options, use the filters or search box to narrow your choices and find the test you want.
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. 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.
  7. You’ll get your results via email & SMS and dive into understanding your body better. Yup, that easy!
  8. If you have any questions, please text us at 754-799-7833 or email [email protected] 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 [email protected], and we'll gladly help you. We've got your back and reply quickly.
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 [email protected]. 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 [email protected].
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 [email protected].

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 [email protected] and we'll gladly help you.

Here’s why 1,000,000+ customers chose us for affordable hassle-free private blood testing.

You get clinical lab reports & simplified health insights.
Save time & gas, go straight to the lab. Our doctors cover the rest.
Results start landing the next day after your lab visit.*
We don’t sell or share your data. Your time & privacy matter.
US-licensed doctors have your back if things get unclear.
No hidden fees, nice discounts for regular checkups.
Save a trip to the doctor, go directly to the lab
Instant orders, results often overnight*
Results explained in simple language
Reviewed by US licensed doctors
Fast & confidential, we never sell or share your data
No insurance needed, transparent pricing
Demo results
Transferrin 425 mg/dL
Demo results
Low Optimal 200 - 360 High
425 mg/dL

What this means

Your transferrin levels are elevated above the optimal range, which typically indicates your body is working harder to transport available iron. This often happens when iron stores are low, and your body is trying to maximize iron absorption and delivery. It may explain symptoms like persistent fatigue or weakness.

* Regular blood test results (e.g., CBC) typically start arriving the next business day after sample collection. More complex tests, such as hormone panels, may take up to 10–15 business days due to their complexity.
Here’s how easy it is to get blood work done on your terms
Choose a checkup
Order your test Save a trip to the doctor. Your results will come with clear, friendly explanations. Takes 2 minutes
Book a lab
Book an appointment Visit any of our 4,000 nearby lab locations to have your samples collected. Book or walk-in
Choose a checkup
Get results Receive a clear, easy-to-digest health report by email & SMS within a few business days. Get answers, fast

Iron Test for Constant Tiredness and Low Energy

Google
3,138 reviews
  • Pinpoint iron deficiency causing your fatigue
  • Reveal hidden anemia affecting your energy
  • Clarify why you feel constantly tired

1,000,000+ blood tests later, here's what our customers say

Google reviews 3138 reviews Next
Still got questions? Text our super-cool support team at 754-799-7833 to get help finding your ideal checkup.