The nutrient deficiencies hiding behind “normal” bloodwork

One of the more frustrating conversations in clinic is the one where a patient brings in a serum vitamin panel, points at a B12 of 450 and a vitamin D of 32, and is told that everything is “normal.” They are not feeling normal. They are not sleeping well. Their hair is thinning, their wounds heal slowly, their muscles cramp at night. And every individual marker on their panel is sitting in the broad band the lab calls reference range.

The reference range answers the wrong question. A serum value tells you what is circulating at the moment of the draw. It does not tell you what is reaching the cell, what cofactors are missing for that nutrient to be used, or what the patient’s actual functional need is. The NutrEval is the panel I order when I want to know what the body is short on, not what is in the bloodstream.

What “functional need” actually means

Functional medicine reads nutrients the way a mechanic reads an engine — by looking at the work the system is doing and inferring what is short. If methylmalonic acid is elevated, the body is short on B12 at the cellular level, regardless of what serum says. If xanthurenate is elevated, B6 is functionally low. If pyroglutamate is elevated, glutathione is being used faster than the body can rebuild it. If the omega-6 to omega-3 ratio is wrong, inflammation is being fed by the patient’s own diet.

None of these are visible on a standard CMP or CBC. All of them are clinically meaningful. The NutrEval reads more than 40 of them, in one collection (blood plus urine), and converts the results into a supplement and dietary plan you could not have built by guessing.

What the panel actually covers

• B-vitamin sufficiency — functional B1, B2, B3, B5, B6, B12, folate, biotin. Each measured by the metabolite the body produces when it is short, not by the vitamin sitting in serum.
• Mineral status — magnesium, zinc, selenium, copper, manganese, chromium, molybdenum. Reference ranges for what the body is actually using, not just what is dissolved in plasma.
• Amino acids — essential, conditionally essential, and the markers that flag protein malabsorption, glutamine depletion, or methylation strain.
• Essential fatty acids— full omega-3 / omega-6 / omega-9 profile, with the inflammatory ratios. Patients are often eating “healthy fats” in proportions that drive inflammation.
• Antioxidant reserves — glutathione, CoQ10, vitamin E, vitamin C, alpha-lipoic acid functional markers. The capacity to handle oxidative stress.
• Heavy metal exposure— mercury, lead, arsenic, cadmium. Not a complete metals workup (that’s the hair test), but enough to flag burden that is affecting nutrient status.
• Oxidative stress and mitochondrial markers — the same chemistry the OAT reads, integrated with the nutrient picture.

The lab’s software then runs the data through an algorithm and produces a personalized recommendation list — which nutrients to prioritize, at what dose, with which cofactors. It is the closest thing to a written prescription that a nutritional test can produce, and it is one of the reasons I trust the panel.

The patients who benefit most

• The optimizer — the patient who eats well, exercises, sleeps, and still wants to know what their body is functionally short on. NutrEval is one of the best longevity-oriented tests I run.
• The chronically fatigued — when bloodwork is clean and the patient is still depleted, the answer is almost always at the cellular nutrient level.
• The post-illness rebuild — after long Covid, after surgery, after cancer treatment, after pregnancy. NutrEval tells us where to put the resources.
• The supplement-overwhelmed patient— the one who takes fifteen things and isn’t sure why. NutrEval is the panel that lets us write a written protocol and stop guessing.
• The methylation case — patients with MTHFR variants or methylation symptoms (anxiety, fatigue, miscarriage history, cardiovascular family history) need to know what their B-vitamins are actually doing, not just what they are taking.
• The athlete — performance is downstream of cellular nutrient status. Most amateur athletes are running on a depleted micronutrient profile and have no idea.

How a NutrEval changes a supplement plan

Most of my patients arrive on too many supplements, in the wrong forms, at doses too small to do anything, missing the cofactors that would make the ones they are taking work. The NutrEval lets us reset that. We keep what is moving the right markers, stop what isn’t, and add only what the data calls for. Patients usually leave the results review with a shorter supplement list than they came in with — and with a written plan that includes dosing, timing, and the date we will reassess.

We don’t prescribe forever. The point of running this test is to fix the specific deficiencies, then re-test in six to twelve months and back the protocol off. Practitioner-grade supplements at therapeutic doses, used for as long as they are needed and no longer.

A supplement plan is a prescription, not a shopping list. We prescribe from test findings and discontinue when the marker is resolved.

If you are taking supplements you are not sure are working, or feeling depleted in a way your serum panel doesn’t explain, NutrEval is the panel that turns guessing into a written protocol — and turns a shelf full of bottles into a plan with a date on it.

The journal is written by Dr. Nazzar from the practice. Articles reflect clinical observation and current research, not personalized medical advice. To explore your own case, schedule a consultation.