Lab Work Before Your Telehealth Visit: Why It Matters and How to Prepare

One of the most common misconceptions about telehealth is that you can't get lab work done. In reality, the process is straightforward — and having lab results in hand before your telehealth visit often makes the appointment more productive than it would be otherwise.

Here's how lab work fits into the telehealth model and why it matters for your care.

Why Labs Matter

Lab work isn't just a formality. For many conditions, blood tests provide objective data that changes treatment decisions:

For mental health:

• Thyroid function (TSH, free T4) — Hypothyroidism mimics depression; hyperthyroidism mimics anxiety
• Complete blood count — Anemia causes fatigue and low energy
• Vitamin D — Deficiency is linked to depression
• Basic metabolic panel — Electrolyte imbalances can affect mood and energy
• Vitamin B12 — Deficiency causes fatigue, cognitive fog, and mood changes

For hair loss:

• Thyroid panel — Thyroid dysfunction is a leading reversible cause of hair loss
• Ferritin — Iron stores below 50 ng/mL are associated with hair shedding
• Vitamin D — Deficiency linked to telogen effluvium and alopecia areata
• Testosterone, DHEA-S — Androgen levels in women with pattern hair loss
• Complete metabolic panel — Kidney and liver function baseline

For skin conditions:

• Hormone levels — For hormonal acne workup (testosterone, DHEA-S)
• Metabolic panel — Baseline before certain medications (spironolactone, isotretinoin)
• Lipid panel — Required monitoring for isotretinoin
• Pregnancy test — Required before prescribing tretinoin or isotretinoin to women of childbearing age

For weight management:

• Thyroid function — Rule out hypothyroidism
• HbA1c and fasting glucose — Screen for diabetes or prediabetes
• Lipid panel — Cardiovascular risk assessment
• Metabolic panel — Kidney and liver function
• Insulin level — Assess insulin resistance

For hormonal health:

• Comprehensive hormone panel (testosterone, estradiol, progesterone, DHEA-S, cortisol)
• Thyroid panel
• Metabolic markers
• Vitamin D, B12

The Telehealth Lab Workflow

Here's how lab work typically works when you're seeing a provider through telehealth:

Scenario 1: Labs Ordered Before Your First Visit

Some providers (including Dr. Kim at CORAL) may order labs before your first visit based on your intake form and reason for the appointment. This approach means:

1. You complete your intake form and medical history
2. Based on your symptoms and concerns, lab orders are placed
3. You go to a lab draw facility near you
4. Results come back (usually 1-5 business days)
5. Your telehealth visit happens with results already available

Why this is efficient: Instead of spending your first visit just talking and then waiting another week for labs and a follow-up, you walk into your telehealth appointment with data. Dr. Kim can review your results, discuss findings, and start a treatment plan in that first visit.

Scenario 2: Labs Ordered During Your Visit

For some conditions, the specific labs needed depend on what comes up during the conversation:

1. You have your telehealth visit
2. Based on the evaluation, lab orders are placed
3. You go to a lab facility
4. Results come back
5. A follow-up visit (or message) to review results and adjust the plan

Scenario 3: You Already Have Recent Labs

If you've had blood work done in the past 3-6 months, those results may be sufficient depending on what was tested. Bring them to your visit — upload them through the patient portal or have them ready to share during the video call.

Where to Get Lab Work Done

You have several options, and most are covered by insurance:

National Lab Chains

Quest Diagnostics:

• Over 2,200 patient service centers nationwide
• Accepts most insurance plans
• Online appointment scheduling at questdiagnostics.com
• Results available through the MyQuest app
• No appointment needed at most locations, but scheduling reduces wait times

Labcorp:

• Over 2,000 patient service centers
• Broad insurance acceptance
• Online scheduling at labcorp.com
• Results through the Labcorp Patient Portal
• Walk-ins accepted at most locations

Hospital and Health System Labs

Most hospitals and large health systems have outpatient lab draw stations. If you have a preferred health system, their lab is often convenient and directly connected to your medical records.

Urgent Care Centers

Many urgent care facilities can draw labs. This can be convenient if you need other services at the same time, though wait times may be longer.

Mobile Phlebotomy

For patients who can't easily get to a lab facility — due to disability, transportation limitations, or schedule constraints — mobile phlebotomy services will come to your home. Insurance coverage varies, but the convenience can be worth the cost for some patients.

How to Prepare for Lab Work

Getting accurate lab results depends partly on proper preparation:

Fasting Labs

Some tests require fasting (no food or drink other than water for 8-12 hours before the draw):

• Fasting glucose — Must fast
• Lipid panel — Traditional guidance says fast, though current evidence suggests non-fasting lipids are acceptable for screening
• Insulin level — Must fast
• Metabolic panel — Fasting preferred for accurate glucose

Practical tips for fasting:

• Schedule a morning blood draw so you're fasting overnight
• Drink plenty of water — dehydration makes veins harder to access
• You can usually take your regular medications with a sip of water (check with your doctor about specific medications)

Non-Fasting Tests

Many common tests don't require fasting:

• Thyroid panel (TSH, free T4, free T3)
• Complete blood count (CBC)
• Ferritin and iron studies
• Vitamin D and B12
• Hormone levels (though morning draws are preferred for cortisol and testosterone)
• Thyroid antibodies

Timing Considerations

• Cortisol: Best drawn between 7-9 AM when cortisol peaks
• Testosterone: Best drawn before 10 AM for accurate results
• Thyroid: Consistent timing is important for monitoring — draw at roughly the same time each visit. Take thyroid medication after the draw, not before.
• Biotin: If you take biotin supplements, stop them at least 48-72 hours before any blood work. Biotin can falsely elevate or decrease several lab values, including thyroid tests and cardiac troponin.

Other Preparation Notes

• Stay well-hydrated — it makes the blood draw easier and faster
• Wear a top with sleeves that roll up easily
• Bring your insurance card and lab order (electronic orders are usually sent directly to the lab by your provider)
• Bring a list of current medications and supplements
• If you're anxious about blood draws, let the phlebotomist know — they can use a butterfly needle and have you lie down

Understanding Your Results

Lab results come with reference ranges — numbers that indicate "normal" for the general population. But normal and optimal aren't the same thing.

Reference Ranges vs. Optimal Ranges

A few examples where this distinction matters:

TSH (Thyroid):

• Lab reference range: 0.4-4.5 mIU/L
• Many clinicians consider optimal: 0.5-2.5 mIU/L
• A TSH of 3.5 is "normal" but may be associated with symptoms in some patients

Ferritin (Iron Stores):

• Lab reference range: 12-150 ng/mL (women)
• Hair loss specialists aim for: 50-70+ ng/mL
• A ferritin of 20 is "normal" but may contribute to hair shedding

Vitamin D:

• Lab reference range: 30-100 ng/mL
• Many practitioners prefer: 40-60 ng/mL
• A level of 31 is "normal" but may be suboptimal

This is why reviewing results with a doctor matters. Your primary care physician may tell you "everything is normal" while a specialist looking at the same numbers through a different lens might identify opportunities for optimization.

At CORAL, Dr. Kim reviews all lab results in context — considering your symptoms, your goals, and the clinical evidence for optimal ranges, not just whether a number falls inside a reference range.

What Happens After Results Come In

1. Normal results, no concerns: Good news discussed at your visit, no changes needed
2. Minor abnormalities: Discussed with you, may lead to treatment adjustments, supplementation, or monitoring
3. Significant findings: Prompt follow-up, potentially before your scheduled visit
4. Critical values: The lab contacts both you and the provider immediately for any dangerously abnormal results

Making the Most of Your Telehealth Visit with Lab Results

When you come to your telehealth appointment with recent lab results:

• The visit is more productive. Instead of guessing, your provider has objective data.
• Treatment decisions are more precise. Medication choices, dosing, and treatment plans can be tailored to your specific numbers.
• Fewer follow-up visits. Getting labs done upfront means you often need fewer back-and-forth appointments.
• Better monitoring. For ongoing treatment, serial labs show whether medications are working and whether side effects are developing.

Getting Started

If you're ready to schedule a telehealth visit with Dr. Kim, here's the process:

1. Start at [coral.clinic/start](https://coral.clinic/start) and complete your intake
2. Based on your concerns, any needed lab orders will be placed
3. Get your labs drawn at a convenient location near you
4. Your telehealth visit happens with results ready for review
5. Treatment plan is established with real data backing every decision

Having lab results doesn't replace clinical judgment — it enhances it. And in the telehealth model, it ensures that a remote visit is every bit as data-driven as walking into a traditional office.