We are using Roche’s reference range but are using the 2.5^th to the 95^th percentile, which is 3.9 to 19.8 ng/mL

The 2.5^th to 97.5^th percentile range is 3.9 to 26.8 ng/L (European population). Due to the large tail which may reflect areas where fortification may influence the upper end of the reference range, I am happy to truncate the upper limit at the 95^th. 

We will be auditing the effect of the new assay at the low end.

martin

From: Clinical biochemistry discussion list [mailto:[log in to unmask]] On Behalf Of Leifur Franzson
Sent: 11 January 2017 15:08
To: [log in to unmask]
Subject: Re: Roche - restandardised folate III method reference ranges

Interesting discussion.

What reference values are the Roche users using for serum/plasma folate with the new reagents  ?



Best regards

Leifur Franzson MScPharm
Specialist in Clinical Biochemistry
Department of Genetics and Molecular Medicine
Landspitali,  Hringbraut
Iceland





From:        "Dr. Sutirtha Chakraborty" <[log in to unmask]>
To:        [log in to unmask]
Date:        19.12.2016 17:03
Subject:        Re: Roche - restandardised folate III method reference ranges
Sent by:        Clinical biochemistry discussion list <[log in to unmask]>

I share the same concerns......
Folate deficiency is very rare in India.  We are the champions at eating green.
However we have faced a sudden increase in folate deficiency with the folate III assay on Roche e411.This transition to the new folate assay gen  has occurred recently, so I dont  have much specific data on the  percentage  of deficiency.

Regards,
Sutirtha

​Dr Sutirtha Chakraborty, MBBS, MD, FACB
Chief Consultant, Department of Biochemistry
Peerless Hospital &  B K Roy Research Center
360, Panchasayar, Kolkata 700094, WB, India



On Mon, Dec 19, 2016 at 8:52 PM, Sally Slack <[log in to unmask]> wrote:

Dear Roche users,

We have recently moved on to the re-standardised folate III method and have applied the reference interval suggested by Roche (3.9-26.8ng/mL).

As a consequence of this we are now reporting 33% of results below the folate reference interval.

Has anyone got an evidence based reference range for the re-standardised folate III method, based on a UK population?

We may be able to get around this using a transference equation, but it would be good to hear what reference intervals other Roche users have in place.

North Cumbrian folk aren’t the best at eating their greens but we can’t all be folate deficient!

Many thanks,

Sally

Sally Slack MBIOCHEM, MSc, FRCPath

Consultant Biochemist

Blood Sciences

North Cumbria University Hospitals NHS Trust,

Cumberland Infirmary,

CARLISLE, CA2 7HY.

Tel:     01228 814521                  Fax:    01228 814831

The NCUHT Pathology Handbook can be found here

For general information on tests see Lab Tests Online

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