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National Health and Nutrition Examination Survey

NHANES III

Lab Public-Use Data Files Usage Notes

File Location:

LAB

Section:

Hepatitis B surface antibody (SSP)

Date:

August, 2002

Description:

Hepatitis B surface antibody testing was only done on hepatitis B core antibody positives. In 1993, 495 additional samples from participants with a medical occupation who were negative for antibody to hepatitis core antigen were tested to determine mIU/ml of antibody to assess vaccination status. Results of the serum hepatitis B surface antibody can not be used to estimate the vaccination status of the U.S. population since all participants were not tested for this serologic marker.

File Location:

LAB

Section:

Serum Biochemistry Profile - All analytes in Biochemistry Profile

Date:

September, 2002

Description:

Additional note to explain possible storage effect on analytes in biochemistry profile

Sera for the Biochemistry Profile was stored at –20o C and then thawed at room temperature. This freeze/thaw cycle has been demonstrated to result in degradation for some analytes in this profile (1-2). Analytes should therefore be used cautiously since degradation could have occurred.

  1. Mosley JW, Goodwin RF. Stability of serum-glutamic pyruvic transaminase activity on storage. Tech Bull Regist Med Technol 1965;35:183-187.
  2. Young, D.S.,ed., Effects of Preanalytical Variables on Clinical Laboratory Tests, 2nd Edition. AACC Press, Washington DC, 1997.

 
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