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Natural Killer Cells (NK Cells) Panel
Blood test

Natural Killer Cells (NK Cells) Panel

$111.33 Member price $155.87 Non-member
Excellent 4.8 out of 5

A frontline immune cell count tied to viral defense and recurrent infections.

Consider this test if:

  • Recurrent, prolonged, or unusually severe viral infections
  • Investigating a suspected immune deficiency alongside other lymphocyte subsets
  • Tracking immune-cell counts during or after immunosuppressive therapy
  • HSA/FSA eligible
  • Results delivered to your dashboard · Reviewed by a real clinician
  • Drawn at a CLIA/CAP-accredited lab near you ·
Pre-test considerations

No fasting required. A recent acute infection, significant physical or emotional stress, and immunosuppressive or steroid medications can shift NK cell counts, so note any current illness or medications. For tracking over time, sampling under similar conditions makes results more comparable.

Video consult with your Care Team

A 1:1 call to discuss your health.

$39.00 $99.00 Non-member

What members say on Trustpilot

  • “Mito gives me 3x the tests for less money” · Page
  • “15/10 experience - I felt actually taken care of” · Reena Sudan
  • “Deeper insights than a typical annual physical” · Nicki H
  • “Loved how specific and actionable the advice was” · Maya Hickey
  • “Stunned at how thorough both the testing and analysis was” · Mark
  • “Tired of arguing with my PCP. Mito got me the answers I was looking for.” · Josh
  • “So easy, it feels like a deluxe experience for your health” · Menetreto
  • “Excellent responsive customer service (a real rarity these days!)” · SS

What this test is for

Natural killer cells are a type of lymphocyte that attacks virus-infected and abnormal cells without needing prior exposure, making them part of the body's first line of immune defense. This panel uses flow cytometry to measure NK cells both as an absolute count and as a percentage of total lymphocytes, identified by their CD3-/CD16+/CD56+ surface markers. Low NK cell numbers are linked to greater susceptibility to viral infections, including cytomegalovirus and varicella, and are often investigated in people with frequent or unusually severe infections. The result is read alongside a broader immune workup, since NK counts shift with acute illness, recent infection, and immunosuppressive medication. It is most useful when recurrent infections or a suspected immune deficiency need objective immune-cell data rather than a one-off explanation.

Biomarkers tested

Includes 3 biomarkers

Find a lab near you

Every draw site is a CLIA/CAP-accredited partner lab. Enter your ZIP to see the nearest locations.

    What to expect

    1. 1 Book instantly

      Click, book, done. Choose a convenient lab location near you. Transparent, up-front pricing.

    2. 2 Quick lab visit

      Testing to fit your busy schedule, usually 15 minutes or less. Walk-in and appointments available.

    3. 3 Fast, dashboard-delivered results

      Your results post straight to your dashboard as soon as the lab completes them.

    4. 4 Expert guidance

      Included with Mito membership. A clinician reviews your results and your personalized action plan follows, with clear next steps.

    Everything your health needs,
    in one membership

    • A Mito member relaxing at home, checking their results on their phone

      Every test at our cost

      Members pay our cost on every test, with lab fees passed straight through. The full receipt is itemized, never padded.

    • Mito dashboard on a tablet showing biomarker results and trends

      Continuous tracking, all in one place

      Upload past labs and watch your trends over time. Every marker and visit lives in one longitudinal record, so all your care stays together.

    • A Mito clinician checking in with a member over text messaging

      Year-round clinician support

      Text anytime and get clinician-reviewed answers. When you want to go deeper, 1:1 consultations are available at affordable rates.

    All for $9/month

    Order any test or consult without joining. For $9/month, members unlock member prices, trend tracking, and year-round clinician guidance.

    Mito Membership

    $9 /mo

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    Without membership

    $0

    pay as you go

    At-cost pricing on labs, scans, and more

    Standard pricing

    Priority turnaround on your results

    On-demand clinician consults when you need guidance

    $39 per 30 min
    $99 per 30 min

    Personalized action plans across supplements, exercise, nutrition, and sleep

    AI health coaching to help you act on your results

    Year-round medical support, with in-chat clinician escalation

    All your health records in one personal vault, with trends and biological age tracking

    Early access to new diagnostics and product releases

    Learn more about Membership

    Frequently asked questions

    View all FAQs
    How does pricing work?

    Every test shows the member price next to the standard non-member price, so you can see what membership saves you. The member price is our cost — covering the lab and what it takes to run the service — never a profit on the test itself; Mito makes its money on the $9 membership, not on marking up your tests. Membership is $9/mo, and you still pay the lab’s order fee. Prices are itemized before you pay, with no hidden fees.

    Where do I get tested?

    Choose a partner lab (Quest, Labcorp, or BioReference) at checkout. If your cart spans multiple tests, we consolidate the whole order onto a single lab so you only make one visit.

    Is this eligible for HSA/FSA?

    Yes. This test is HSA/FSA eligible, and you can pay with your HSA/FSA card at checkout.

    When will I get my results?

    Your results post to your dashboard once your lab completes them, then a clinician reviews them and your full analysis and personalized action plan (with clear next steps) follow. Turnaround varies by test: specialty assays and at-home kits take longer, and each test shows its expected turnaround before you buy.

    Do I need a doctor’s order?

    No. Mito provides the lab order for you, so you can book and get tested without a separate doctor visit.

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