ELNA Medical Logo
Generic selectors
Exact matches only
Search in title
Search in content
Post Type Selectors
Clinics & Appointments
.
  • English
  • Français
Generic selectors
Exact matches only
Search in title
Search in content
Post Type Selectors
Medisync
Omnimed
Medfar
.
  • English
  • Français
Patients

SERVICES

Family Medicine
Urgent Care
Pediatrics
Specialized Medicine
Private Care
Mental Health
View All Services

ELNA NETWORK

Clinics
Our Medical team
Packages

RESOURCES

Medesync Portal
Medfar Portal
Blog
Newsletter & communications
Discover the App
Healthcare
Professionals

ELNA NETWORK

Practice With Us
Continuing Professional Development (CPD)
Partner With Us
Our Medical Team
View All Services
Clinics

RESOURCES

Medesync Portal
omnimed Portal
Blog
Newsletter & communications
Businesses

CORPORATE MEDICINE

Occupational Health
Aviation Medicine

ELNA NETWORK

Partner With Us
Blog
Newsletter & communications
About Us
About ELNA
Executive Team
History
Diversity, Equity & Inclusion
In the Community
Work at ELNA
Partner With Us
Newsroom
.
Blog
Share

Share this with your community

or copy link

Link of the page
copy

How to prepare for a blood test?

  • health checkup, laboratory services
  • May 20, 2024
prise de sang ou prélèvement sanguin en laboratoire avec une infirmière

Has your doctor prescribed a blood test as part of a check-up or to detect a possible disease? In our article, find out what to do before your appointment, what is the procedure and where to take your blood sample.

  • What lab tests are performed?
  • How to prepare for my appointment?
  • Do I need to fast?
  • How is a blood test done?
  • Is it painful?
  • When can I get the results?
  • Appointment for a blood test

To find out more about blood sampling and other laboratory services, please contact our subsidiary CDL Laboratoires.

What tests are performed using blood samples?

Blood sampling is an invaluable tool for various medical analyses and diagnoses. Here are some of the common tests performed on blood samples:

  • Complete blood count (CBC): This common test provides information on your general state of health. It analyzes the quantity and quality of red blood cells, white blood cells and platelets in the blood, as well as other parameters such as hematocrit and hemoglobin.
  • Glucose test: important for diagnosing and monitoring diabetes.
  • Cholesterol test (lipid panel): Helps determine your “good cholesterol”, “bad cholesterol” and triglyceride levels.
  • Screening for STBIs (Sexually Transmitted and Blood-borne Infections): Some STIs, such as HIV and viral hepatitis, can be detected by blood testing. Other STIs require urine testing or other types of sampling.
  • Genetic testing: Genetic mutations are detected using DNA present in the blood, in order to screen for certain cancers, cardiovascular diseases or other pathologies.
  • Prenatal screening: Performed on pregnant women, a prenatal screening test can detect trisomy 21, trisomy 18 and trisomy 13 in a future baby, as early as 10 weeks into the pregnancy.
  • Drug and alcohol screening
  • Food and environmental allergies

These examples represent only a fraction of the tests that can be performed on a blood sample. Depending on clinical needs, other more specific tests may also be performed. Talk to your doctor or laboratory professional.

How to prepare for your appointment?

Proper preparation for a blood test can help make the experience more comfortable and ensure accurate results. Here are a few steps you can take to anticipate and get ready for your appointment:

  • Stay sufficiently hydrated: Although fasting may be required for some analyses (see next chapter), it is generally recommended to drink enough water before blood sampling. This will increase the volume of blood in the veins and facilitate sampling.
  • Avoid stimulants: Coffee, energy drinks, alcohol, cigarettes and drugs can alter results, even if consumed 24 hours beforehand. Please seek the advice of a healthcare professional.
  • Wear comfortable clothes: Choose comfortable clothes that allow easy access to the arm (short or loose sleeves), as blood sampling is generally done at the elbow crease.
  • Bring your medical information: Don’t forget your prescription and your public and private health insurance card!
  • Relax: If you have any fears or apprehensions about blood sampling, try some breathing exercises and talk to the person taking the sample. They’ll be able to reassure you and explain the process.

Don’t hesitate to ask a healthcare professional for recommendations adapted to your test or situation.

Do I need to fast before a blood test?

Some blood tests require fasting, but not all! Eating can influence levels of glucose, lipids and other substances in the blood, affecting the accuracy of test results. Fasting provides more stable and reliable measurements for these parameters. For example, the glucose test requires fasting, but the blood count does not.

Only a healthcare professional (doctor, nurse, laboratory personnel, etc.) can provide you with fasting instructions. This may involve not eating or drinking (except water) for a specific period before the appointment.

If your doctor has not advised you to fast, eat a meal balanced in proteins and sugars to limit the risk of discomfort during sampling.

laboratory blood sampling for medical analysis

How is a blood test done?

Blood samples must be taken at a test center or blood collection center. Some private laboratories, such as CDL Laboratories, also offer blood test service at-home.

After checking your identity and the test to be taken, the laboratory technician or nurse will seat you comfortably in a dedicated room. You can indicate on which arm you would like the sample to be taken. A tourniquet is placed above the elbow to draw out the veins on the inside of the elbow. Once the vein area has been disinfected, a sterile single-use needle is used to collect the necessary blood samples. The amount of blood taken is very small and has no risk to your health.

Once the sample has been taken, the healthcare professional applies a bandage to the puncture site, which you can press for 1-2 minutes. Samples are then labelled and sent to the laboratory for analysis.

Is it painful?

The process is usually quick and very painless. You may feel a stinging or burning sensation at the puncture site, followed by a small bruise. Side effects are very rare, but if you feel any slight discomfort, speak to your professional.

How long does it take to get lab test results?

If you have your sample taken at a public analysis center such as a hospital, waiting times for an appointment can be quite long.

If you don’t want to wait, it is also possible to have blood samples analyzed by private laboratories such as CDL Laboratoires, capable of delivering results within 24 hours for most tests, and within a few days for certain analyses such as prenatal screening.

Appointment for a blood test in Montreal

Need an appointment for a blood test in Montreal, Pointe-Claire, Pierrefonds or Ville Saint-Laurent? CDL Laboratories, a subsidiary of the ELNA Medical Group, offers private medical laboratory services in the Greater Montreal area, including laboratory sampling and analysis, and many other tests.

Make an appointment at CDL Laboratories

  • No appointment necessary for most tests
  • Results in less than 24 hours for most tests
  • At-home blood collection service
  • Most accredited laboratory in Canada and Quebec
  • Covered up to 80% by most private medical insurance plans
  •  
    Click or drag files to this area to upload. You can upload up to 2 files.
    Loading
    Contributions | Reviewed and approved by Shelley-Ann Smith, Head Nurse at CDL Laboratories (May 2024).
    Share
    Blog

    Related Articles

    bilan de santé avec un médecin à Montréal

    Why have a medical check-up? Reasons not to wait

    rendez-vous avec un médecin dans une clinique privée

    Private clinics: services, prices, coverage and other frequently asked questions

    bonnes résolutions santé

    New Year’s resolutions for good health

    Subscribe to our communications

    Subscribe

    You might also be interested in

    bilan de santé avec un médecin à Montréal
    Why have a medical check-up? Reasons not to wait

    Why have a medical check-up? Reasons not to wait

    •
    February 24, 2025

    A medical check-up can help prevent and detect health problems. Find out if you need one, and how to go about it.

    Read
    dépistage cancer colorectal
    Screening for colorectal cancer with a colonoscopy

    Screening for colorectal cancer with a colonoscopy

    •
    February 3, 2025

    Find out how colonoscopy can help detect colorectal cancer, which causes over 9,000 deaths a year in Canada.

    Read
    rendez-vous avec un médecin dans une clinique privée
    Private clinics: services, prices, coverage and other frequently asked questions

    Private clinics: services, prices, coverage and other frequently asked questions

    •
    January 23, 2025

    Find out everything you need to know about private clinics: services offered, costs, reimbursements, access, waiting times and much more.

    Read
    problèmes de peau en hiver
    Eczema, psoriasis, rosacea… How to take care of your skin in winter?

    Eczema, psoriasis, rosacea… How to take care of your skin in winter?

    •
    January 9, 2025

    Winter exacerbates skin problems such as eczema, psoriasis and rosacea. Find out why and how to prevent them.

    Read
    bonnes résolutions santé
    New Year’s resolutions for good health

    New Year’s resolutions for good health

    •
    January 3, 2025

    What if 2024 was the year you finally followed through on your health resolutions? In our article, discover some tips for a healthy, balanced year!

    Read
    ELNA Beating Heart blue on blue - News
    ELNA Medical Group obtains Creditor protection under the CCAA to pursue restructuring and commence Court-approved Sale and/or Investment Solicitation Process

    ELNA Medical Group obtains Creditor protection under the CCAA to pursue restructuring and commence Court-approved Sale and/or Investment Solicitation Process

    •
    December 11, 2024

    ELNA announced today that the Québec Superior Court has granted the Company’s application for an initial order under the CCAA

    Read
    repas temps des fêtes
    20 tips to avoid holiday season excesses

    20 tips to avoid holiday season excesses

    •
    December 6, 2024

    Discover our tips on diet, exercise, sleep and mental health for a healthy and balanced holiday season!

    Read
    homme en consultation avec un médecin pour perdre du poids
    How do you know if you have diabetes? Risk factors, signs and diagnosis

    How do you know if you have diabetes? Risk factors, signs and diagnosis

    •
    November 25, 2024

    Diabetes affects some 1.2 million people in Quebec. Find out how to detect the first signs and what to do if you have symptoms.

    Read
    fatigue au réveil après avoir mal dormi
    Why am I always tired? Find out if it’s a sleep disorder

    Why am I always tired? Find out if it’s a sleep disorder

    •
    November 18, 2024

    Chronic fatigue may conceal a sleep disorder. Find out if this is the case for you and when to consult a health professional.

    Read
    homme alcoolique dépendant à l’alcool
    Alcohol, drugs, gambling and other addictions: how to know if you are addicted?

    Alcohol, drugs, gambling and other addictions: how to know if you are addicted?

    •
    November 11, 2024

    Addiction to alcohol, drugs or gambling can affect anyone. Find out how to know if you're addicted and what to do about it.

    Read

    You may also be interested in

    Family Medicine
    Learn More
    Urgent Care
    Learn More
    Pediatrics
    Learn More
    Specialized Medicine
    Learn More
    Private Care
    Learn More
    Laboratory
    Learn More
    Mental Health
    Learn More
    Allied Health
    Learn More
    Wellness
    See all services
    See all services

    Comprehensive care from your family doctor.

    Consult your family doctor
    Occupational Injury Services

    Quality care, when you need it most.

    IF YOUR CONDITION IS SERIOUS OR LIFE-THREATENING, CALL 911.

    See a doctor quickly
    Fastrack Program (AB only)

    Personalized care for your children’s health.

    General pediatric consultations
    Allergy
    Audiology
    Endocrinology
    Specialized Pediatrics
    Child Psychiatry
    Nursing Care
    Nutrition
    Physiotherapy
    Psychology
    Speech Therapy 

    Comprehensive specialized care.

    Allergy
    Cardiology
    General surgery
    Dermatology
    Obstetrics 
    Gynecology
    Gastroenterology
    Infusion
    Urology

    Quality care, when you want it.

    Family Medicine
    General Surgery
    Men's Health
    Women's Health
    Maternal Health
    Child Psychiatry
    Nursing Services
    Obesity and Weight Management
    Esthetics
    Sexual Wellness
    STI Screening

    Fast and reliable testing.

    Laboratory Services
    STI Screening
    Sleep Apnea

    We’re here to help

    Psychiatry
    Psychology
    Child Psychiatry
    Virtual Psychiatry
    Maternal Health
    Sleep Disorders

    Healthcare professionals dedicated to caring for you

    Chiropody
    Nutrition
    Physiotherapy
    Podiatry
    Social Work

    Supporting your wellness goals

    Esthetics
    Obesity and Weight Management
    Elna_Medical_Vert_WHITE_Transparent_RGB_EN
    About Us
    About ELNA
    Newsletter & communications
    Blog
    Newsroom
    Our Partners
    Work With Us
    Practice With Us
    Careers

    Follow Us

    Facebook-f Twitter Linkedin-in Instagram Youtube
    Download the App
    Privacy Policy
    Terms & Conditions

    Copyright ELNA Medical © 2024 All rights reserved