LabPreparation

Lipid & Cholesterol

CBC, CMP, UA, Thyroid, & Lipid Health Tests Preparation: Fasting

  • Blood draw
  • Lipid & Cholesterol
  • Prep checklist included

At a glance

CBC, CMP, UA, Thyroid, & Lipid Health Tests: prep snapshot

Sample type
Blood draw
Fasting
Fasting may not be required for all components, but some tests in this panel may need it.
Best collection time
Blood and urine samples can typically be collected at any time during lab hours.
Typical turnaround
Varies by collection lab
Category
Lipid & Cholesterol

This page explains how to prepare for a CBC, CMP, UA, Thyroid, & Lipid Health Tests, what the test measures, and what to confirm with the collection lab. This standard health testing panel combines several common lab tests to evaluate your overall health.

What the CBC, CMP, UA, Thyroid, & Lipid Health Tests measures

The CBC measures components of your blood, such as red and white blood cells and platelets. The CMP evaluates chemicals in your blood, including glucose, electrolytes, and liver and kidney function markers. The UA assesses substances in your urine, while thyroid tests measure thyroid hormone levels and the lipid panel measures cholesterol and triglycerides.

  • CBC
  • CMP
  • UA
  • Thyroid
  • Lipid Panel

Getting ready for the CBC, CMP, UA, Thyroid, & Lipid Health Tests

No routine preparation is generally necessary for this panel. However, the testing location can advise on any specific timing or fasting requirements.

  1. Stay hydrated by drinking water before your appointment.
  2. Avoid alcohol for at least 24 hours before the test.
  3. If you are taking medications, ask your lab whether they might affect results.
  4. Wear a short-sleeved shirt to make blood collection easier.
  5. Arrive at the lab with your test order and insurance information.

Fasting, timing, sample type, and what to bring

Fasting

Fasting may not be required for all components, but some tests in this panel may need it. Confirm with your lab whether you should fast and for how long.

Best time to collect

Blood and urine samples can typically be collected at any time during lab hours. For the most consistent results, try to collect your samples at a similar time of day if you are repeating the test.

Sample type

Blood draw. The collector will explain the process before starting.

What to bring

  • Your printed lab order or requisition form — the ordering physician prepares it for you after you order, and you print it (or fax it from your account) before visiting
  • Your order confirmation email, in case the collection site asks to see it
  • A written list of the medications and supplements you currently take
  • A short-sleeved or loose-sleeved shirt for an easy blood draw
  • Water to drink before the draw and a light snack for afterward, if your test requires fasting
  • A government-issued photo ID (most collection sites verify identity at check-in)

You do not need an insurance card or a payment method at the collection site: the lab does not bill insurance, and you pay at order time, so there is no copay or deductible. The lab also provides the physician's requisition, so you do not need a separate doctor's referral.

Order process and what-to-bring details reflect the lab's published instructions, paraphrased in our own words. Confirm final requirements with the collection lab that will perform your draw.

The collection visit, step by step

A phlebotomist will draw a small amount of blood from a vein in your arm using a needle. You will also be asked to provide a urine sample by urinating into a sterile cup.

Details worth confirming with the collection lab before your visit:

  • Do I need to fast before this test?
  • Should I take my medications on the day of the test?
  • What is the expected turnaround time for results?

Why a clinician may order this test

A healthcare provider may order this panel as part of a routine checkup to screen for common health issues. It can also be used to monitor existing conditions or evaluate symptoms.

Understanding your results

Reference ranges for each test in this panel can vary by laboratory and by the method used. Your results will be compared to the range provided by the lab that performed the testing.

General test information is compiled from publicly available reference material, including MedlinePlus (medlineplus.gov) and the Centers for Disease Control and Prevention (cdc.gov), and is reviewed for clarity. Preparation and what-to-bring details reflect the lab's published instructions, paraphrased into our own words. Preparation instructions, timing, and pricing vary by collection lab — always confirm them with the lab that will perform your draw.

Common questions

Frequently asked questions

Do I need to fast for this panel?

Fasting requirements depend on the specific tests included. The lipid panel may require fasting, but not all components do. Confirm with your lab.

How long does it take to get results?

Turnaround time is typically 1 to 3 business days. Your healthcare provider will receive and discuss the results with you.

Can I take my medications before the test?

Some medications can affect test results. Ask your healthcare provider or the lab whether you should take your medications as usual.

Is this test painful?

Blood collection may cause a brief pinch or sting. Urine collection is painless. The entire process is usually quick.