Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

NIST micronutrients measurement quality assurance program winter 2002 comparability studies : results for round robin LI fat-soluble vitamins and carotenoids in human serum and round robin 16 ascorbic acid in human serum:: Page feedback

* Indicates required field

Was this page helpful?

Yes

Comments or suggestions? (optional)

Please do not put Personal Identifiable Information (PII) in this field.

Your email address (optional)

CAPTCHA

Get new captcha!

What code is in the image? *

Enter the characters shown in the image.

This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.

Was this page helpful?