Skip to main content

Dr. Q’s Questions for March

1. Why are TSH results of samples taken a few weeks apart seemingly discrepant? 

TSH exhibits not only pulsatile secretion with an amplitude of about 1 mU/L, but a modest circadian pattern with a nadir in the mid-afternoon. TSH peaks daily around 1400 with a marked decline from about 0700 to 1000, the period most patients visit our collection sites (see Fig. 1 below). This change may be substantial – up to 3 mU/L. Analytical factors add only a modest level of scatter, typically less than 1 mU/L.

2.How do you interpret and act upon a TSH result consistent with subclinical hypothyroidism?

An excellent on-line Communiqué was recently published by the Mayo Clinic and can be found at: www.mayomedicallaboratories.com. 

Dr. Jan Palaty, Clinical Biochemist

Learn more details

 



LifeLabs Verification Step

You are being taken to the payment form. Please check the box below to proceed.

     

    For rush results (NAAT within 12 hours and PCR within 24 hours)

    1. Order your FlyClear test and receive your FlyClear test requisition
    2. Book an appointment at a LifeLabs location below.
      • Bring your printed FlyClear requisition and Passport
      • Select your ordered Province’s Rush Test to start booking:
      British Columbia

      6084 Russ Baker Way
      Richmond near Airport

      COVID-19 PCR (24h) / Rush 12h NAAT

      Ontario

      6084 Russ Baker Way
      Richmond near Airport

      COVID-19 PCR (24h)
      Rush 12h NAAT
      Rapid Antigen (2h)

    Pre-Departure testing now available from the comfort of your home with MyVisit (Currently Greater Toronto Area only)

    1. Order your FlyClear test and receive your FlyClear test requisition.
    2. Book your Home Visit appointment with the MyVisit portal or, if your flight is within the next five days, contact a MyVisit coordinator 1-416-993-9579 (Monday – Friday, 9am-5pm EST)

    MyVisit Pre-departure testing offers:

    • COVID-19 PCR/NAAT swab testing
    • COVID-19 Antibody Blood (serology) testing

    The MyVisit fee is $80 per person.

    Pre-Departure testing

    Book your appointment online here. If your flight is within the next five days and you have received your FlyClear requisition, please contact a MyVisit coordinator 1-416-993-9579 (Monday – Friday, 9am-5pm EST).