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📅 Last Updated: March 2026 | 🩺 Medically Reviewed by: Edward Salko, D.O. | 🧪 Lab Partner: Labcorp Also Known…
📅 Last Updated: March 2026 | 🩺 Medically Reviewed by: Edward Salko, D.O. | 🧪 Lab Partner: Labcorp Also Known…
This anemia blood test and B12 deficiency test is useful in assessing an individuals nutritional status or to evaluate…
Also Known As Potassium Serum, Serum Electrolytes, Serum Potassium The Purpose of a Potassium Test Almost every part of your body,…
The Purpose of a Vegan Blood Test Vegetarian, and especially vegan, diets aren’t a passing fad. From 2004 to 2019 alone,…
📅 Last Updated: March 2026 | 💳 HSA/FSA Eligible | 🧪 Method: IgE Blood Test (No Fasting) 🩺 Medically Reviewed…
This test measures the amount of selenium in the blood and monitors selenium deficiency and occupational exposure. Selenium is…
📅 Last Updated: March 2026 | 💳 HSA/FSA Eligible 🩺 Medically Reviewed by: Edward Salko, D.O. (NPI #1285747725) 🧪 Lab…
📅 Last Updated: March 2026 | 💳 HSA/FSA Eligible 🩺 Medically Reviewed by: Edward Salko, D.O. (NPI #1285747725) 🧪 Lab…
Also Known as Na Test The Purpose of a Sodium Test Sodium in your food adds flavor, but sodium in your…
Vitamin D regulates calcium absorption, immune function, mood,
muscle performance, and inflammation. Low Vitamin D is linked
to depression, frequent illness, bone loss, muscle weakness,
and poor sleep. Supplementing without testing first is
ineffective — you need to know your baseline level to dose
correctly. Optimal range: 40–80 ng/mL. Most Americans test
below 30 ng/mL.
Order: Vitamin D (25-Hydroxy) Blood Test
B12 deficiency is extremely common in adults over 50, vegans
and vegetarians, people on metformin (a common diabetes drug),
and anyone taking acid reflux medication long-term. Symptoms
include fatigue, memory problems, tingling in hands and feet,
depression, and anemia. B12 deficiency is often misdiagnosed
as depression or early dementia. Normal range: 200–900 pg/mL.
Levels below 300 pg/mL often produce symptoms even within
the “normal” range.
Magnesium — The Most Overlooked Mineral
Order: Magnesium RBC Blood Test
Folate deficiency causes megaloblastic anemia, elevated
homocysteine (a cardiovascular risk marker), and neural
tube defects in pregnancy. Folate and B12 work together —
a deficiency in either produces similar symptoms and both
should be tested simultaneously. People on methotrexate,
those with inflammatory bowel disease, and heavy alcohol
users are at highest risk.
Reviewed by Edward Salko, D.O., Medical Director, Personalabs
Sources: National Institutes of Health Office of Dietary
Supplements (2024); CDC Nutrition Report (2023);
Labcorp Test Directory (2025).
Dietary choices account for health and wellness across all ages. When you’re eating a nutritionally sound diet, you’re getting an array of vitamins, minerals, and other nutrients. As a result, you have abundant energy, improved mood, protection against infection and other immune system invaders, and much more.
But when your diet lacks important nutrients, or you skip meals or overeat, you may be at risk for health issues such as type 2 diabetes, obesity, and other metabolic disorders. You may also have a vitamin deficiency due to medical conditions such as kidney disease, liver failure, or inflammatory bowel disease. Vitamin blood tests can pinpoint areas where you need some extra nutritional support.
Nutrition blood tests, such as the Basic Vitamin Panel or the Comprehensive Vitamin Profile Blood Test, can give you a general overview of multiple vitamin and mineral levels in your body. You may also choose a vitamin deficiency test that focuses on specific nutrients. And if you’ve recently changed to a plant-based diet, the Optimal Vegan/Vegetarian Profile Blood Test helps detect potential imbalances that need to be addressed.
There are several vitamin deficiency tests to check levels of nutrients, such as:
If you are taking Ozempic, Wegovy, Mounjaro, or another
GLP-1 medication, vitamin and nutrient monitoring is
particularly important. Rapid weight loss can accelerate
depletion of fat-soluble vitamins — particularly Vitamin D,
Vitamin B12, and Zinc — as caloric intake drops significantly.
Muscle loss on GLP-1 medications also depletes magnesium and
B12 at accelerated rates.
Most GLP-1 prescribers recommend a baseline vitamin panel
before starting and a follow-up at 3 and 6 months to catch
deficiencies before they produce symptoms. The Basic Vitamin
Panel at Personalabs covers Vitamin D, B12, and Folate in
a single draw — a practical starting point for anyone on
a GLP-1 medication.
Your doctor may recommend a blood test for vitamin levels if you have symptoms indicative of a nutrient deficiency or a medical condition that may prevent you from properly absorbing certain nutrients. Your healthcare provider may also use a nutrition blood test—either on its own or in conjunction with food sensitivity tests—to help diagnose a medical issue. You can also use vitamin blood tests to monitor your overall nutritional wellness.
It’s easy to order vitamin tests online with Personalabs. Browse our selection of tests, find the one you need, then download the lab order after making your purchase. You can get the blood work done at any of our 4,000-plus partner facilities across the country. Take a vitamin and nutrition test near you, on your schedule.
You can typically expect to see the results in your secure and confidential Personalabs digital portal within 24 to 48 hours. Share the results with your physician to develop a customized nutritional plan.
If you want to optimize your well-being for a vibrant lifestyle, explore our collection of general health and wellness tests, as well as our men’s and women’s health tests. Personalabs puts control of your healthcare choices in your hands.
Vitamin D is the most common vitamin deficiency in the United States — affecting over 40% of American adults. Deficiency is linked to fatigue, depression, poor immune function, bone loss, and muscle weakness. Most people are unaware they are deficient because symptoms develop gradually. A Vitamin D (25-Hydroxy) blood test is the only way to confirm your actual level.
Fatigue is the most common symptom of multiple deficiencies simultaneously. The most important vitamins to test for unexplained fatigue are Vitamin D, Vitamin B12, Folate, Magnesium, Iron, and Ferritin. The Basic Vitamin Panel or Comprehensive Vitamin Profile covers all of these in a single blood draw without requiring a doctor’s visit.
It depends on the specific test. Most vitamin and mineral tests do not require fasting. However, if you are combining your vitamin panel with a lipid panel or glucose test in the same blood draw, those tests do require fasting. Check the preparation instructions for each test when ordering.
Serum magnesium measures magnesium in the liquid part of your blood — but only about 1% of your body’s magnesium is in the blood. RBC (red blood cell) magnesium measures magnesium inside your red blood cells, which is a much more accurate reflection of your body’s actual magnesium stores. Standard blood panels almost always use serum magnesium, which frequently misses true deficiency.
Yes. Testing before supplementing is the clinically correct approach. Taking high-dose Vitamin D without knowing your baseline level risks toxicity. Taking B12 when you are not deficient wastes money. Testing first gives you a precise starting point, helps you dose correctly, and lets you retest in 3 months to confirm your levels have improved.
Yes. Personalabs provides the physician-signed lab order as part of your purchase. Order online, visit any Labcorp patient service center near you, and get results in your secure account within 24–48 hours. No referral, no insurance, no doctor visit required.
Everything You Need to Know About Magnesium Deficiency
Don’t take magnesium deficiency lightly. This mineral plays an important role in many of the body’s functions, and a nutrition test can detect a lack of magnesium to help prevent serious health issues. Discover the health benefits of magnesium and why you should get a nutrition blood test.
How to Know if You Have a Vitamin D Deficiency
Vitamin D deficiency is more common than you may think, and a vitamin blood panel can help determine if you’re lacking in this essential nutrient. Get informed about why vitamin D is critical for good health, the symptoms caused by low levels, and the nutrition test you should take.
Nutrition Tips For Achieving Your Healthy Goals
You are what you eat, and smart food choices are a wise way to maintain optimal health. Take our regular nutrition tests to ensure you’re on the right track. We give you nutrition tips you can put into action every day, plus our top suggestions for vitamin blood tests.
